These Audio Illusions Fool Almost Everyone

[@agnosticpanda6655]

Weird. To me sound B sounds clearly higher than sound A.

[@krakputi8328]

Yeah. And that's when I lost him. :)

[@Catalyph]

I immediately though, B was higher, and that it was multiple notes, the base was similar. I was exactly right..

[@thunder852za]

I thought I, for the first time in my life, explained why I am a crappy singer. But alas others are the same.

[@legadric1]

Yeah. I was like why even watch the video, my mind ain't playing no tricks.

[@nopetuber]

same!

[@matiKRK]

My phone's speaker was not able to produce a 100 Hz and I was confused why there was no sound

[@_waiai]

Thanks for the explanation, I just started playing the video and thought I was going deaf 😭

[@lordforlorn5694]

I thought I was going deaf wtf

[@TheOhioNews]

Yeah I didn't hear anything either

[@lolliii5477]

yeah, and for me i just got out of a wood workshop i thought my hearings are permanently damaged

[@TheDragoonDR]

Same thanks a lot I was really scared for the past 10 minutes

[@MADMAXX-7]

"Put on headphones for the full experience." "Ok, will do." **deaf through church organ**

[@Superman111181]

Lol! I read this half of one second before the organs started ..

[@lordcola-3324]

Yeah, that was an actual asshole move Derek

[@black-snow]

Death by a thousand pipes.

[@soyanshumohapatra]

*Same bro* My earphone was not fitted well But after listening to him I fit the earphone and it was so loud the next second

[@thulium_3169]

i read this comment, I still was so not prepared

[@danielmcnicholl5488]

I enjoy how passionate the dude was about the organ

[@ShadwRaze]

Agreed. Dude shined everytime he talked about it. That's someone who loves his job and I love to see that

[@AdamNeely]

I'd be very surprised if many people thought that A sounded higher than B.

[@qexat]

right? I was so confused

[@MegaSahil009]

You'd be more surprised because i didnt hear sound A at all, even at my phone speakers at max

[@screetchycello]

I heard it both ways! On phone speakers B definitely sounded higher, but on decent headphones I heard the illusion.

[@another-anonymous-username]

I don't know. This depends on your definition of higher. I personally seem to hear exactly what I see on the graph with the sum of the tones: - The sound is higher overall; - It has a lower component that is the loudest; - It also has several higher components I can individually make out. Sorry, don't know the correct terms. Trying to describe in my own words.

[@meriwoo7382]

If anything, it sounded brighter

[@BattleMercy-uf2zy]

"You should put on headphones" :) *Gets organed*

[@wytsewolf]

Yea my phone speaker doesnt even make a sound with A

[@kirilrotan7653]

@@wytsewolf Same for my laptop

[@Mike-er2ih]

That was a D move. Well played Veritasium.

[@h-hhh]

​@@純白の天使ラフメシアqifsha motren zezak

[@depeltenburg6916]

@@純白の天使ラフメシア it been a couple of minutes later and you lied… so that can only means this backfired and now for every one that did translate you loose 1 heartbeat of all the heartbeats you had in life….. you’ll remember this reply at the end….

[@peporgan]

Thanks for featuring me in this amazing video! I had a great time exploring the Town Hall organ with you.

[@JDoors]

Glad you replied so I could find and check out your channel. Amazing!

[@premodernist_history]

You were awesome in the video. Your channel looks really cool. Looking forward to watching more of the content on there.

[@samanjj]

Thank you mate! Do you guys have shows? We would love to come and watch/listen

[@zakdee2732]

Hey, what powers the organ? Can't imagine it working like a piano with hammers. Amazing bit of kit.

[@peporgan]

@@zakdee2732 giant wind chests and electric blowers

[@4kyleazz]

Plot twist: "Put on headphones for a better experience" Audience proceeds to get Rick Rolled by an Organ

[@rycin7091]

The thumbnail being changed multiple times a day is the biggest illusion of them all

[@SaiSS961]

😂😂

[@workdowg]

There is the comment I came here to find... Otherwise I was going to say... "That's not what his last video was about...".

[@SteadyRiot]

And the name

[@alexander_a.]

Does anyone remember the prvious names?

[@Aleks_Mv]

That's a KZbin feature. Creators upload multiple thumbnails. Initially different people are shown different once but eventually the algorithm makes the one people clicked the most as permanent.

[@forformgamer]

I love how giddy the organ player was to show you everything! He loves what he does!

[@jwalster9412]

For a musician it must be really fun to play with every instrument at once.

[@nicksamek12]

Sound B sounded higher to me though lol

[@anuragjuyal7614]

Same

[@TyroneSmithTDS]

Sameee😂

[@voidscar]

yeah same. Something wrong with....everyone else clearly.

[@robgable2426]

Me too

[@TheDubbleA]

Same here

[@PCcardboard1354]

The "Fair, bear" one is INSANEEEEE I love this channel!

[@NidusFormicarum]

I hear "there" though or rather "v-there" probably because "B" is voiced.

[@ItzShigeko]

i heard gay and hey lol

[@parrisnia72]

@@NidusFormicarum I heard vair and bear

[@jessegrisham]

As an audio engineer, I immediately thought, "Wow, that sounds like the same thing but with the first couple of harmonics." Guess I can keep my job then.

[@georgefeyen8759]

fr i was like "thats an octave higher and something else also" 150hz on 100hz would be a 5th higher, isn't it?

[@arthurmoran4951]

explain

[@dzk33]

To my ear, they sounded like the same pitch, but one was a sine wave and the other square.

[@gorgolyt]

Yeah sounded like the same pitch to me, the second is just buzzy... i.e. different timbre. Not sure what this guy is talking about tbh. 🤷‍♂

[@t3ch_n0]

Lmao same here as a musician. my instant reaction was to ask, "what do you mean by higher?" Like if we are talking about the fundamental then they are the same, but B has the highest overtone.

[@AAArend]

<a href="#" class="seekto" data-time="616">10:16</a> No matter how hard I try, I can only hear he worlds "low" and "high" scrambled through one another

[@dall3n88]

On a soundbar I could only hear "high" but with headphones I clearly hear the "high" and "low" as separate words

[@timonruttimann9368]

Sorry for being weird, but I hear "tiger".

[@malysyforethought1195]

I get Dark-light, but I also suffer from tinnitus on both sides, so maybe that makes a difference?

[@1992jamo]

I heard "blank" or "clang" over and over

[@marsrockfromspace5750]

got "low" and "tide"

[@undeniablySomeGuy]

"Which sound is lower" A - single note B - chord uhh

[@MrAydinminer]

That part of the video made me so mad cause I've been making music for 5 years and it was so obvious to me that B just had harmonics added to it

[@jaredroscoe800]

​@@MrAydinminer😡😡😡

[@mightyhelper8336]

My brain interpreted sound b as an amplitude modulated sound A so they sounded the same (I.E An osc controlls the amplitude of osc A)

[@corentinm.105]

What I hear is actually the same note, with a different timber (more grainy) for B

[@coder0xff]

Stopped at 0:13 and downvoted

[@Gatorboy5678]

Shepherd’s tone is literally what anxiety feels like but in sound form.

[@Spongee-w1g]

Hold it.. hold it... hold it.... then drop the Bass ! That's what dance music, techno, trance and other genres use, you know it's coming and the anticipation is what drives the euphoria at the release.

[@iambenmitchell]

I have cochlear implants, streaming this video directly to my processors and thus pretty much directly to my brain… some of the illusions don’t work, others work but not in the way you expect and it’s so hard to describe

[@YoUtUbEhAnDlEsArEgReAt]

I also have a coch that lears but for some reason all these frequencies do is tickle my grundle? I'm not disagreeing with you - but I think there's more to this than pure sonic vibrational ego-masturbation going on here. Wish you the best. Keep on keeping on. Much love.

[@obfuscated3474]

Tickle your what now? ​@@YoUtUbEhAnDlEsArEgReAt

[@jafinch78]

Would be interesting to see what types of wireless electrodeless hearing system exist now and not the electrode designs. Especially being the RF and microwave hearing effect is somewhat more main stream again where was forgotten and I think concealed in classification schemes since more weaponized now a days.

[@ー-ーー]

probably cause the cochlear implant doesnt give the same signals as the ear drum. also the cochlear implant's microphone doesnt pick sound up the same good/way.

[@williamsung9317]

Wow thats so cool

[@PerfectChaos7]

For the Cocktail Party Effect at <a href="#" class="seekto" data-time="817">13:37</a>, I've noticed this in my everyday life: I often listen to music while in the shower. But when the music shuffles to a new song, I find it hard to hear the song and know what song I'm hearing over the sound of the running water splashing on the floor. But once I find out what the song is (either by looking at my phone for its title, or from hearing and making out a very distinct part of it), my brain is then able to perfectly differentiate the song's sound waves from the noise of the water.

[@chsinger96]

I sometimes start humming/singing/whistling along to what I think I'm hearing, but then when the intro is over and the song gets loud, I suddenly realize I was exactly a half note flat the entire time.

[@Gkkiux]

It works for me with music, but I couldn't focus on any of the voices in the example

[@Um...Yep.]

@@chsinger96 Same here - especially if the tuned part of the introduction is bass only (e.g. Billy Jean, or, from Metallica's black album: My Friend of M. or The G. that Failed).

[@ResoluteGryphon]

You ever come in on the wrong beat of a familiar song and can't identify it? Then suddenly your brain picks out something familiar, corrects itself, and you hear the song normally?

[@jasonarthurs3885]

Is that more recall/remembering vs. distinction?

[@EthelJung-j5w]

Plays two really quiet sounds "Put on headphones for the full experience." Incredibly loud organ

[@SamuQu]

I came to say this, I was about to switch when the organ came through the speakers😅

[@tastytoes6935]

Ya, got me too. Lol.

[@jace8490]

Yeah wtf lol

[@39bigmarks]

bot alert

[@AtheismMan]

Turn down your headphones...

[@topherthe11th23]

I am grateful for this video because I read somewhere (and I've believed it until today) that it's not the wave-shape that tells you what the instrument is, but only the beginning of the note (the "attack"). Because of the different way a flute, a violin, a trumpet, and a clarinet get started on the note, the attack is different. My source said that as you continue to listen to the note, the psychology of the fact that you heard the note begin and so figured out, already, what it was, will KEEP you hearing it as that same instrument. The source said that if you were to listen to a note held 15 seconds on a clarinet and on a trumpet but deleted the first 1 second of each recording, you would not be able to tell them apart because the attack would be in the 1 second that you deleted, and, it said, the attack is where the identifying signature of the note is, nowhere else. But today, seeing, side-by-side at <a href="#" class="seekto" data-time="224">3:44</a>, a trumpet and a flute playing the same note, I can see that it's the shape of the overtone-sums that make it sound like a trumpet or a flute. FURTHERMORE, I should have KNOWN this would be the case if I just thought for a second about how organs mimic the various other instruments. No organ has a part that takes the place of the human tongue in a trumpet, clarinet, or flute. (The tongue is often flicked into the airstream to begin a note for at least two of those). Nor to replace the bow of a violin. (Or am I wrong? Does some organ do that?) It seems that the organ can ONLY work with an airstream that is off or on, with abrupt transitions between off and on, and all transitions being the same regardless of the pipe. So for a pipe to sound like a given instrument's note, something else, I should have thought, is going on. So today I no longer believe that paragraph I read so long ago. Viva La Internet! I know it can carry falsehoods as well as truths, but the person who cares CAN find the truth even if they have to sift a lack of pies to get there.

[@milenanasser1821]

I absolutely love your comment!

[@fllthdcrb]

The attack transients do, in fact, help with identifying an instrument. They just aren't the only information you use; the timbre is important, too. So neither you nor the source you read are entirely correct. And yes, certain organ stops do sound a lot like specific instruments, largely due to the timbre. But not exactly like them. While I could identify e.g. an oboe stop as such, there's no way I would mistake it for an actual oboe, for at least a couple of reasons. One being the attack, and the other being ambient acoustics: such an instrument is in one place and relatively quiet, while the corresponding organ stop may be louder, its different notes will come from different locations (because each note is played by a different pipe), and may be more subject to room ambience (as pipe organs are often installed in large rooms with very reflective walls). "Nor to replace the bow of a violin." Interesting you should bring up the method of sound production. No, organs generally don't have bows or anything (except maybe as a gimmick?? Theater organs are known for having lots of "toy stops" whose mechanisms depart drastically from the classic diapason, flute, string, and reed families, including many that don't use pipes at all, so such a thing is possible, though I don't know if this specifically was done). String stops use flue pipes, like the diapasons and flutes, so they, more than any others, are unlike their namesake instruments. FYI, the stops imitating reeded woodwinds do use reed pipes; not too big a surprise there. But the ones named after brass instruments are _also_ reeds. Though it makes sense when you think about it: brass instruments are driven by the player vibrating their lips, which is basically the same as the vibration of a reed, just with different subtleties of course.

[@CookieeeKiddo]

I aint reading allat

[@EthelJung-j5w]

As a musician, sound A sounded lower, and sound B sounded like a chord with the same root note as A, the 5th and the octave,, and sounded higher because of the two additional notes, mainly the octave.

[@iamtherealrenedescartes]

The issue was the sound didn't have enough harmonics in the series for the illusion to take effect. The sound needs to have sufficient partials for you to hear the missing fundamental. So the first tone was 100hz, which you'd expect the harmonics to be integer multiples of 100hz. So 100hz, 200hz, 300hz, etc. As a side note, the closest actual note with a fundamental of 100hz is G#2. By adding 150hz, and 200hz, these multiples aren't multiples of 100hz but instead follow after a fundamental of 50hz instead of 100hz. Since a 50hz note will have integer multiples of 50hz instead of 100hz. This _should_ create the illusion of hearing a fundamental close to a G#1 note (50hz); an octave lower than the first tone when playing 150hz, 200hz along with 100hz. Since G#1 is the closest note to 50hz. Another side note, just a semantic note, the additional tones are harmonics. Not notes. A musical note has a harmonic series following a fundamental which makes the timbre. If he in fact played the actual musical notes corresponding with the fundamentals using a real instrument, like a piano, the illusion would have had a better effect rather than playing pure tones. This means playing G#2 followed with a fifth (which would be a D#3 note), you'd hear the fundamental of G#1 (which is lower than G#2).

[@ronald3836]

To me B sounded higher, too, even though before clicking on the video I knew it was going to be about combining higher harmonics to fool the ear into hearing a lower bass.

[@chrisbentley4374]

I agree... Trying to hum along, I locked into the root for both, but recognized B was not a single tone, but nonetheless felt like the same pitch...

[@haydenwalker-]

🤓☝

[@asainpopiu6033]

Fking bot go away.

[@athirkell]

<a href="#" class="seekto" data-time="1029">17:09</a> This is why dogs (and other animals) cock their heads to one side when they're concentrating hard - it lets them more easily recognise the source of sounds vertically as well as horizontally. Super cute to boot.

[@wingjaigaming8240]

I heard this from from Smarter Every Day too! (no pun intended)

[@jmkass]

Omg, is that why they do it? That's so cute

[@itsthevoiceman]

​@@wingjaigaming8240and SciShow!

[@artugert]

Don't humans do that too?

[@jacobshirley3457]

@@artugert Pretty sure, at least, in my experience. If you're confused, you'll also notice you may tilt your head.

[@elendiastarman]

Deaf guy with cochlear implants here; I've had bilateral implants for most of my life (16+ years) and I can hear incredibly well for a deaf person. Also while watching this video, I'm using some tech which pipes audio straight from the computer to my processors so there's no speaker/microphone in between. Each processor can stimulate about a hundred different frequencies, my brain does a lot of post-processing to fill in the rest. All that to say, this video touches on a lot of stuff that I deal with on a daily basis! * I couldn't hear sound A at all; 100 Hz is literally too low for me to hear. So naturally, sound B sounds higher. ^_^ * That tune you played about <a href="#" class="seekto" data-time="581">9:41</a> into the video didn't ring any bells for me at all - simplifying it down to just the notes means I lose all the extra information that makes it possible for me to match it to things I've heard before. So I'm miffed you didn't say what it was!!! * I didn't hear any particular words for the phantom word illusion around <a href="#" class="seekto" data-time="624">10:24</a>, it was just "BOM bum BOM bum BOM bum...". * That bear vs fair example is exactly why I lipread people constantly and why I struggle so much with anything and everything that's audio-only - phone calls, videos without captions, podcasts, songs with lyrics not written down, etc. I hear Lady Mondegreens all the time and it's very frustrating when a song has unclear lyrics (which is MOST of them!!). * The cocktail party effect demonstration was very interesting - of course I couldn't pick out the specific conversation in the beginning, but even after hearing just the one voice by itself, I could *barely* follow that one voice and couldn't understand any words at all through the whole thing. In noisy/crowded situations, I *have* to be nearby and looking at the person I'm talking with to understand them; the visual correlation is the only way I can track their voice in the noise (and I'm lipreading to help). It doesn't help that I'm autistic and my brain filters background noise *after* processing it. * I only started being able to localize sound recently within the last few years and it's still not very good, but a big part of what helps is that my left side sounds higher and my right side sounds lower, and I can *feel* which side I'm hearing things on. My processor mics are located within the pinna and it *does* make a big difference compared with having them out of it! * Apparently binaural beats don't work for me at all. It just sounded like a pure tone. (Incidentally, this is also a problem with chords; only within the last year was I able to hear a chord as a chord rather than a single "note".) "Without your brain making these subconscious adjustments, a cocktail party would always just sound like a total mess." - what do you mean, *would*?? They *do* always sound like a total mess!! 😉

[@cj_daniel]

Tune is the melody from Yankee Doodle.

[@veritasium]

Super interesting feedback, thanks for sharing

[@winters4147]

I'm partially deaf. Entirely in my left ear and not at all in my right ear, so I have my headset set to mono, so both sides play the exact same thing. Any song or video that relies on swinging between either side is completely lost on me and I don't even notice that they're doing it. I also can't hear specific noises over a lotta background noise either! It's a constant problem in my life, I barely hear shop clerks over music or busy stores. Let alone a party. So yeah, I was also stumped by the cocktail party effect. On the plus side, I can simply lie on my right in bed and the pillow muffles all the sounds when the street is busy outside :D

[@ShadowWarrior277]

I've been hard of hearing my whole life as well, so this resonates with me. (pun not intended)

[@the_mister_magister]

IRL Cyborg, so cool

[@cwarky7325]

This was really interesting and thoughtfully presented form of infotainment - well done!

[@Koushakur]

<a href="#" class="seekto" data-time="9">0:09</a> It was so obviously B I thought it had to be A because it's supposed to be the one you didn't think it was when asked like that...

[@koriroti]

Lol same. B vibrates my phone, while A is dead silent. Not even a vibration

[@kered13]

Same. Audio B sounded very clearly higher to me. Maybe it has something to do with your audio setup.

[@ottoihccus]

Bone conduction headphones rattles the head more during sound B

[@pernal9956]

you need to put on headphones, it will sound completely different

[@BGP00]

Exactly lol. And im wearing headphones

[@AnkitGarg]

<a href="#" class="seekto" data-time="470">7:50</a> "listen carefully to the music" then proceeds to talk over the music 😅

[@davidgro2000]

Maybe to not be sued by Nintendo.

[@Monkeymario.]

when he talks it breaks the illusion kinda

[@JimPekarek]

Those of us with audio processing disorders are completely baffled by people's ability to navigate the cocktail effect. To me it's indistinguishable noise, and increased volume is the only way to overcome it, but then everyone starts doing it and the room gets insanely loud.

[@mauriceachermann6544]

do people with adhd have troube with this?

[@douggolde7582]

This is why I always seek out the quiet area. With luck this is also close to the beer.

[@Nicomv-eu3pd]

@@mauriceachermann6544 yeah ADHD makes you have difficulty focusing, and Autism doesn't really let you separate the noise automatically, i have both, so i don't really know if it's ADHD or Autism's fault i can't hear anything, but other people with Autism have said that they can't focus on one single noise properly

[@MarkusWolff]

@@Nicomv-eu3pd I got ADHD and I've been struggling with this forever. Fun fact: While meds help with other focus issues, they won't help with this.

[@BlondieSL]

@JimPekarek, I know of what you speak. I was diagnosed with this issue as a young kid. In a gathering of people, it's very difficult for me to pick out individual voices if the sound levels are high. So long ago, I had to learn how to read lips. This helps greatly. It also comes in handy in other, non-gathering situations. LOL I have learned to live with it, quite well.

[@RileyLastname]

I have Auditory Processing Disorder (APD) which means in a room with many people talking or multiple noises playing at once (as alluded to at the very end of the video) I actually do experience all cocktail parties as sounding like a mess! My ears technically work fine, but my brain struggles to prioritize any one line of sound over any other and become unable to hear anything properly, it all gets compressed down into one chaotic line of sound without being able to pick out anything. I rely a lot on lip reading to try to maintain conversations in noisy restaurants but that's just an assistive tool, it doesn't actually improve my hearing. For this reason I'm so grateful for this channel's subtitled videos!

[@DenZhdanovPianist]

When I learned to tune pianos, I noticed something funny: you start to hear very high overtones, like the 6th overtone of a bass note, but that overtone sounds lower than the actual key. This happens because the equal temperament system makes us "stretch" the frequencies, making high notes a bit higher than they should be compared to the bass note's overtones. This is an awesome video for music enthusiasts and beginners!

[@ansgarschaefer5411]

Stretching and equal temperament are distinct things. You would encounter the same observation in a piano tuned just, meantone, or pythagorean. The reason is that in a piano string, the overtones are not exactly at frequencies that are multiples of the fundamental. The thicker and stiffer (less stringy) the string ist, the more pronounced this effect becomes.

[@Emblazened]

To me, sound B sounded clearly like sound A with another higher tone stacked on top of it.

[@mallebornoptimus5880]

This is what I thought. The moment sound B came in I abandoned the question "which tone is lower?" because the second one was clearly multiple. And right at the moment of cutoff I was like "I'm pretty sure it's the same note and more than one above it". Then again, I'm a singer. Other people might have different mileage based on how precisely they usually listen to music. What I will say is that sound B was "fuller" which is precisely why we prefer chords to single notes most of the time.

[@nathanaaronfernandes9698]

Bro was born without any survival instincts 💀

[@vibaj16]

same

[@Byggherren]

bro i swear everyone of y'all turned into musicians all of a sudden, to me A was slightly higher than B. But this is not debatable it's a scientific phenomenon as he explains later in the video where different wavelengths conform to make a similar tone to what the lower tone would be. There could be so many different reasons you aren't hearing it from bad speaker quality to software like EQ's changing it.

[@trolley01]

Yeah I agree, I thought he was going to say B was supposed to be the higher pitched sound but I thought it was also clear that it was the same pitch as A but with a higher pitch played at the same time but apparently A is higher, I played it back several times before coming and looking at the comments Definitely wouldn't rule out digital audio related reasons for that though like what Byggherren mentioned

[@argfasdfgadfgasdfgsdfgsdfg6351]

<a href="#" class="seekto" data-time="465">7:45</a> "Players can't level up until they collect enough COINS." ...... That's sacrilige. Society is beginning to crumble.

[@julia4740]

LOL just what i thought

[@DorAntCr]

that's not even the only mistake, 9:52 is missing some ledger lines and a key signature

[@chemist1379]

My brain just melted after hearing that. My disappointment is immeasurable

[@PersonaRandomNumbers]

In awe of the fact that Derek has somehow avoided Mario 64 long enough to not instantly know how wrong that is

[@aliasanonym9778]

Part of my childhood died with that sentence. I'm getting old.

[@damianvanbilsen8943]

That organ player could entertain me for days going on about it, seems like a lovely dude.

[@PeterStuckey]

Check out Lady Anna Lapwood

[@MrRunchSlam]

Sonos Arc Speaker: A sounds lower than B Audioengine A2 Speakers: A sounds lower than B Sony WH-1000XM4 Headphones: B sounds lower than A Sounds like this is more an audio processing issue than a brain issue

[@Space_Reptile]

yea on my AKG K612 headphones A is lower than B aswell

[@AlessandroRodriguez]

me with my earbuds: hear nothing

[@ivan_thespacebiker]

I play electric organ, and when using the harmonic trick I find that headphones without a lot of bass make the effect more pronounced. My guess is that our brain is trained to fill in the gaps, and headphones/speakers with a lot of bass just don't have those gaps

[@R2Bl3nd]

Well it sounds like those headphones are potentially doing a lot of processing to the audio. If you used headphones with a flat frequency response it would probably match the intended experience.

[@R2Bl3nd]

@@ivan_thespacebiker often, consumer headphones significantly increase the bass compared to a flat frequency response so it would make sense that people with consumer grade headphones as opposed to professional grade ones would not be getting the intended effect.

[@ShadowGear238]

<a href="#" class="seekto" data-time="1262">21:02</a> This is how string instrument (violin, viola, cello) players can tune their instruments reliably given only one note (A = 440 Hz, usually). When you play two strings consistently at the same time that are a perfect 5th apart, but slightly out of tune, you get the same pulsing effect. As you adjust the string you’re tuning, the speed of the pulses slows until they disappear, which is when they’re a perfect 5th from each other. I’m sure the effect works for other instruments that can produce constant consistent tones as well.

[@psychosis7325]

At the start do you hear A or B as higher?

[@WaraxTheThird]

Yep! In a pinch, you can tune a guitar to itself and I do it all the time :)

[@ZakuHD]

@@psychosis7325depends, you tune string 1 (I assume you mean A with that) perfectly with a reference tone and then pluck on a guitar or use the bow on a string instrument and try to hear if string 2 (B) is lower or higher. Then you just start spinning those little tuning pegs. If the beating gets worse you turned the wrong way and go the other way. You do that until the beating stops = you‘re perfectly tuned to string 1 Rinse and repeat for the other strings respectively

[@ShadowGear238]

@@psychosis7325 I hear A as higher, though I’m just just my crappy phone speakers

[@ShadowGear238]

@@ZakuHD I *think* they were asking about the start of the video, that being said, that’s exactly how it works. Though with my guitar it’s easier to use a tuner (for me). The sound dies too quickly to hear the beats. A lot of guys with really good pitch can do it by ear though

[@PrelapseYT]

Audio engineer here, adding overtones is actually a technique we sometimes use to enhance a bass and make it sound deeper. We do this so that lower instruments will sound “bassier” on smaller speakers, which can’t produce the actual lower frequencies

[@JJWo]

That’s good info. I use Logicpro to make music and I always wondered why imported bass loops sound so much better than anything I can produce even with all the plug ins. I was wondering whether maybe those plug ins will add overtones as you say - but I’m still pretty green when it comes to sound production

[@neonblack211]

sound deeper is a misnomer though its really so it has higher harmonics you can hear as well as the sub frequencies, i know what you are saying though

[@JJWo]

@@neonblack211 that does give me a clue though and something to work with … interesting illusion because you think it sounds bassier but I guess it’s really just fuller - like when you overlay vocal takes - sound a lot fuller (or is that different) I guess that’s a chorus effect which is still covering all the same frequencies

[@neonblack211]

@@JJWo it’s more like adding distortion to a guitar tone or adding noise or EQ to the high end, over drive or distorting a sine wave will give it a tonne more harmonics and it becomes immediately more obvious across the spectrum, yeah it’s kind of fuller it’s just a more complex sound that spreads across the frequency spectrum, chorus ect is more akin to layering like you would do if you were recording rhythm guitar twice and layering them over each other, layering sine waves completely messes with the fundemental and will introduce some kind of beating effect unless they are perfectly in tune and in phase, which is good and bad depending on what you’re doing.

[@KarstenJohansson]

I think that, and the 2Hz example he gave are actually the same illusion. When there is a difference of 2 Hz between the two tones, you get a 2Hz beat. In the overtone example, there was a 50Hz difference, and therefore a 50Hz beat.

[@ammsaas2838]

<a href="#" class="seekto" data-time="776">12:56</a> I have only saw them hitting each other, since the beggining. I think that is because there is no frame of them interpolating in each other... But even if there was, the quantity of previous frames with the position of each circle at each frame show us that, even if the circles pass through each other at some moment, it wouldn't be shown anyway, so the frame right after the circles would have colided/merged is the same either way.

[@TheSupermUniverse100]

<a href="#" class="seekto" data-time="5">0:05</a> I think a lot of people are claiming to hear the opposit of what you're saying. I think this could be that you did the overtone effect wrong. Usually, the overtones do not have the same amplitude as the root tone. They are usually lower in amplitude. Think of a fourier series in which you're doing a linear combination of sinusoids. It would be wrong to assume that each sinusoid has the same amplitude.

[@kcnl2522]

What the hell are you smoking man, what does a fourier serie have to do in this?

[@thierrypauwels]

Indeed, I heard sound B higher than sound A. The strange thing is that I did already the same experiment with sound that I created myself by generating a function and then converting it to a wav file. The difference was that I used clearly higher pitches. And then I really heard a lower tone by adding higher frequencies. It is most pronounced when you start, say, from 300 Hz, and then add 400, 500, 600, ..., i.e. add multiples of 1/3 of the original sound The resulting sound may sound as 200 Hz or 100 Hz, but anyway a fifth lower than the original sound.

[@pann05]

Maybe it was their speakers? It did sound different in my laptop vs iPad. Sound A was sounded higher in laptop and B in iPad

[@refatkam246]

İ didn't even hear it 😭😭😭

[@georgealgozzini1828]

You deaf brah. ​@@refatkam246

[@GartsTanks]

I have a very difficult time separate conversations. EVERY time I'm in a space with more than one conversation going on, it sounds EXACTLY like the cocktail party example, no matter how near or far the other conversations are happening. At the same time, I found it very useful when I was working in a recording studio, as I could hear each instrument clearly while they were playing simultaneously. I was able to catch mistakes far more often than anyone else in the control room.

[@martijnposthuma3121]

I can relate to that. No difference in jumbledness in the two runs of the conversations. That "when primed it becomes easy" does not work for me.

[@JoshGinter]

​@@martijnposthuma3121same experience. Still no idea what they anyone was saying. And this is something I really really struggle with in real life too. I can't have a conversation with someone while something in playing on TV. Parties are a challenge. I end up doing a lot of lio reading.

[@shasings]

i see ive found my fellow neurodivergents

[@baleygr9480]

This honestly explained many of my problems as a non-native speaker. I understand most of the vocabulary, but because I am not used to the language I can't predict what words someone will use next. Therefore my brain has trouble picking the correct words out of all the background noise and jumbled mess of sound. It makes sense, because I can often hear someone but can't determine which words are being said

[@the_mowron]

I was thinking of trying to talk on the telephone with a non-native speaker. It's so embarrassing to be unable to understand someone on the phone when I can understand that same person when speaking in person.

[@Luzi-chan]

i have had this for a long time too, but one day it clicked in my brain and i could understand, speak, and predict words almost perfectly. i actually have sometimes problems finding the words in my native language and vise versa. sometimes i have to use a translator. and this annoys my fam pretty much, since they speak and understand next to no english.

[@immersediguana2326]

Really interesting thoughts about language acquisition when it comes to hearing, (active) listening, understanding, and so on. I grew up with multiple languages at home, and several more outside the home as well (moving to different countries after some years in each country), and I find that I can quickly separate and pick out words in a language that is unfamiliar to me, and memorize them, yet other times I'll struggle to understand people around me I have known for a long time and that I have a language in common with that I speak fluently. My best guess is that it depends on what "language mode" and "language expectation" my mind has in any given moment. For example, subconsciously "expecting" Spanish, when the incoming words are in Finnish, or something else. And language is a use-it-or-lose-it resource in our minds. Even for languages that I'm fluent in, I notice some "stagnation" when I haven't needed it for a longer time. And not to mention that language evolves continuously, adding, removing, and modifying words and sentences in relatively short periods of time.

[@hellmrf]

same here!

[@ArneVanhove]

Same here, also, the clip of the voice is too shor this video. I'm guessing it was the women's voice? Way to low in volume compared to some other voices.

[@jillmartin5089]

Your videos are so well done. I really enjoyed learning a bit more about sound.

[@vger2]

My second piano teacher built a pipe organ with pipes installed from floor to ceiling on every wall in his living room and the basement beneath it. The lower (bass) note pipes were all in the basement and when he played those notes on the foot keyboard, you felt it more than heard it. He traveled the country to attend church auctions and such to collect the various pipes over the years. Bach’s Toccata and Fugue on that… chills.

[@Mikexception]

I think many people overestimate size of sound sources which have ability to produce very low frequencies like 16 - 20 Hz . Main point is not the size but alowing such low frequency to emerge from all other sounds. That is also why church organs ar so successfull because each frequency has it's own resonant acoustic system and thay do not interfere . In audio systems producers usualy assign one common acoustic system for all produced frequencuies and it is impossible traget. I was able to crack that problem in my moderate speaker systems and get even that low "push" .. Anyway it is unique

[@pihermoso11]

​@@Mikexception that's why most audiophiles break down their sound to 3 speakers, one for bass starting as low as 20hz, a speaker for mid range, and a tweeter horn for higher frequencies all the way to 20khz above No single speaker might be able to cover all the range without losing quality, and unlike gaming and movie setups where it's all bass and treble boosted, quality in audio means a flat rate response as much as possible

[@Mikexception]

​@@pihermoso11 1. Yes, audiophiles do things which in 99,9999% have no, or bad result. 2. I explained why for audiophile systems it is almost impossible (not total 100%) to thjink about competing to 8 thousand systems and countable (not analog type) quqntity of frequencies. You realy think audiophiles research such complicated problem? Audiophiles have no such premeditations and they reproduce natural instruments having continuous variety of frequencies - different situation requiring compromises. . 3. I do not exepct that also organs cover whole capability of human hearing - it would be the same nonsens as covering it in audio speakers. How long would be the organ tube for 20 kHz? Then due to its miniature size what power would be capable to put to church space ? With speaker technology is no difference except room is much smaller, required power also smaller and it is possible to enforce by hugh amplification. So it is possible to achieve and make as false timbre as "ordered" . 4. "Flat rate resonse" in one of reasons why audiphiles have so many confuses and pay for voodoo. I is too difficult to understand for amateurs. They can only understand perfection of stright lines and dome rounded box corners.

[@pihermoso11]

@@Mikexception flat rate response is about replicating the same wave produced in a studio, as shown using instruments such as a signal generator and oscilloscope with little difference as much as possible, I'm an electronic technician and have used such instruments, sounds are waves and waves can be quantified as a mathematical input, it only gets a bad rep if somebody sold you something as a 'flat rate response' product but actually is far off from performing as one , people can lie but a calibrated oscilloscope will display the wave without any use of sales talk

[@Mikexception]

@@pihermoso11 And you recall thet you are electronic technician to proof something in acoustic? At least you are not using your criticizm beacause theories are obviously applicble to electronic circuit design but not at all to judge reproduction of hearing sensation Where would you connect your measuring probes in ears or ideal in brain to get "technical" infotrmation about how the percepted sound is equaly percepted as the one which was recorded? Your results on screen are applicalble only to compare owned trusty electric impulses. acoustic.impresson is way too complicated to be measured - you would be surprised with list of dependencies. . "Flat response" if by miracle acheved (only in anechoic chamber but in practice in theory only) are due to Fletcher Munson works easy proven . greatly false

[@JulesStoop]

<a href="#" class="seekto" data-time="55">0:55</a> That was uncalled for!

[@TheOansari]

I paused mid sentence when he said, "if you have headphones handy--" and grabbed my Pixel Buds Pro and resumed the video, "--well, I recommend putting them on for the full experience." Then I went deaf.

[@lifezap2484]

😂😂😂

[@Tosty_82]

😂😂😂😂

[@ronniew3229]

Exactly, did not help my tinnitus.😮😅

[@GordieGii]

Those knobs on either side of the keyboards are called 'stops.' When you push them in they 'stop' that bank of pipes from playing. When you pull them out they allow that bank to play. When you 'pull out all the stops' you use every single resource at your disposal.

[@johnbaxter9875]

Thank you. I appreciate that comment. I learned something new today.

[@FraktalPriest]

Thank you 😋

[@danaxtell2367]

By legend, J.S. Bach would pull out all the stops of an unfamiliar organ as a kind of stress test. If the air pump could blow air through all the pipes at once, it would be the loudest sound. Almost certainly, it would not be a desirable, musical sound. "Pulling out all the stops" now means "giving it your all," but there may be a giggle factor for the music majors in your audience. Our teachers were kind when they told us to avoid cliches.

[@johnbaxter9875]

@@danaxtell2367 I was thinking earlier today that the comment to which we've both replied sounds like one of the rabbit holes my music theory teacher would have dashed down during one of his lectures . I learned more about language in music theory than the rest of my college courses combined.

[@koszeggy]

We call them registers.

[@benchapple1583]

It just wrecks my mind that someone can manage 5 keyboards, 40 stops and a footboard at the same time while reading music. Boggles the mind!

[@Dante...]

Derek: In Mario 64, players can't level up until they collect enough coins. Anyone who's ever played the game: Wot?

[@pukas7389]

Speedrunners: Bruh

[@ShadowGear238]

This should been the top reply

[@kylehamilton3393]

He's obviously a sonic guy lol

[@Ashstyx0]

wot

[@Dörtichi]

ai generated script

[@alexrogers777]

<a href="#" class="seekto" data-time="592">9:52</a> hearing the unscrambled version did literally nothing when hearing the scrambled version again. Like absolutely zero change.

[@calabrais]

Same! I'm glad I'm not the only one, I even listened to it a few times 😭

[@fran6b]

You have to hear the original melody in your head while the scrambled one is playing. What you hear in your mind literally become an instrument that play with the external sounds.

[@MatsueMusic]

For me its familiarity with that song, I know it...but not as well as say twinkle twinkle or happy birthday

[@trevinbeattie4888]

I still have no idea what the _unscrambled_ tune is supposed to be.

[@orangebeagle3068]

@trevinbeattie4888 I know the song as “Yankee doodle”.

[@Account81658]

"I recommend putting headphones on" * IMMEDIATELY BLASTS EXTREMELY LOUD ORGAN *

[@ChillaxeMake]

the fact that he hearted it makes it even funnier

[@legoseanland1760]

I came here to say that :)

[@charliesieben5695]

It was his organ that made that sound?! :O

[@Cassinspace]

Second only to standing next to the organ

[@uhohhotdog]

Wasn’t loud to me

[@Justa_mia]

Whenever i watch your videos, I always say "wow, I think i have KZbin premium" because you're sharing something that shouldn't be free! Thankyou!^^

[@SilverFlint247]

"Cocktail party effect, most of us can do it with little effort" This my friend is the bane of my existence. I can clearly see that others are able to do it easily all night long but for me, a thing that I cannot do. It affected my life you have no idea how. To me all that chatter combine together and my brain is unable to isolate one. I avoided parties all my life because it is like torture to me.

[@MatthewBrannigan]

Yes, same here - it really ruined my social life, I wish there was some kind of cure.

[@TheSynit]

Yup me as well. Even at a noisy area like a busy road, shopping center etc. I can be 1 meter from them starting directly at them and have a hard time isolating sound. It was no different in this test either i couldnt focus on the sound even when played in 1 ear.

[@bunnysparklzbunnytime5117]

Oh my that sounds like heaven. Anytime I'm in a restaurant or crowd of some sort I'm following everyone else's conversations along with my own.

[@diamondthree]

This problem is a common symptom of ADHD.

[@eroraf8637]

Are you neurodivergent? I have autism and ADHD, and this rings ALL THE BELLS.

[@_jsonV]

I'm convinced Derek has never played Super Mario 64. "Players can't level up until they collect enough coins." <a href="#" class="seekto" data-time="467">7:47</a> Stars. C'mon, Mario collects stars.

[@bellermVA]

He doesn't level up either 😭

[@jakesteampson7043]

Neither does he need all the stars to reach the top

[@IchigoMait]

You seem to have never played super mario bros, you collect coins there, even if yes the game he showed doesn't do that. There are older super mario games than the ones you know of. The leveling up part is though nonsense.

[@walderlopes3372]

Yeah I said "stars" when he said coins. You collect both coins and stars in Mario 64, but for that particular staircase, it's stars to unlock. Or glitch through it with the reverse jump thing.

[@Nejby]

chatgpt ass script

[@Lord_Yoshi]

<a href="#" class="seekto" data-time="460">7:40</a> "In Super Mario 64, there's a staircase that seems to go on forever. Players can't level up until they collect enough coins." You w0t?

[@LucenProject]

One sentence is a truth and one sentence is a lie.

[@TheJayKayA]

he means "stars" (70 needed) and not "on that stairs" but "before in the game" (:

[@Bluhbear]

@@TheJayKayA and also get rid of "level up" :P

[@Viki1999]

That part is about as accurate as the bit with the two different tones at the start lmao

[@applesnstuff7028]

Credibility ruined forever /s

[@youtuuba]

There is a field that some people call "psychoacoustics", and it deals with lots of unexpected and fascinating aspects of sound and the human brain. One example of this is if you are in an auditorium, listening to a concert, or a lecturer, you might not realize that the air conditioning is making a fairly loud hissing sound, or the nearby subway or highway is contributing a very low set of frequencies, audible or merely perceived as a feeling. But if an accurate audio recording is made at the same time, then played back "out of context" with the original environment, it is hard to NOT hear this hiss and/or rumble. The human brain is able to easily tune out sounds that have nothing to do with the subject, but out of context it is all just part of the overall sound and the brain can't easily tune it out.

[@jordyboy62]

Gotta love the solution to the Air Traffic Controller issue not being headsets......

[@artmarkham3205]

I guess the idea is that the controllers need to be listening to more than one pilot?

[@allanoepping9002]

Air traffic control started in the 1920s, with the first radio equipped tower in 1930. They had vacuum tubes and relays. The first electronic computer was invented in 1946 and civilian radar was appearing by 1950. I'm not sure what time period this problem occurred but the pilots are probably tuned to shared frequencies and they would likely have to maintain some awareness of the other activity. I was in a air traffic control room in the late 80's perhaps early 90's and they did use headphones and could select a plane on screen and communicate with that plane - presumably automatically switching to the correct frequency. So as things progressed the requirements and available tech would have changed and the traffic control would have adapted.

[@haydenlongest3964]

The technology just wasn't there. Some 911 Centers were still using handset phones and open air mics and radios till the mid 2000s. Headsets that combine radio and phone, are a relatively recent change to some centers. getting random vendors to play together (phones and radios) was hard to accomplish.

[@hundvd_7]

@@artmarkham3205 That is _entirely_ solvable with headsets. Rather, the pilots need to be listened to by multiple controllers.

[@AutPen38]

It reminds me that in the control centre of an emergency ambulance response team, individuals answering calls have headsets, but the manager often listens to the whole room and needs to be aware of which calls sound more urgent just based on one side of the conversation. A good manager can "tune in" to the most important call above the background noise of all the others.

[@Jacob-Vivimord]

<a href="#" class="seekto" data-time="465">7:45</a> "Players can't level up until they collect enough coins." My confidence in the accuracy of these videos just plummeted. :p

[@baksoBoy]

I heard that part of the video and instantly started scrolling through the comments

[@myhatisawesooome]

@@baksoBoy same.

[@weakw1ll]

😭

[@koerel]

That sentence is so hilariously wrong 😂

[@PJ-oe6eu]

Gamers are insufferable.

[@Silkari]

I'm a trained musician and immediately recognised they both shared the same fundamental frequency and that B contained the fifth and octave. It's really interesting that this is experienced differently for others; for me there was no doubt.

[@gsurfer04]

I studied music tech and sound engineering in school and also picked up on the trick. Felt good to know I've still got it after 15 years.

[@LeviticusStroud]

Similar. I picked up on the second sound being higher due to including higher frequencies in the mix, it didn't sound lower to me at all. Mostly guessed at it being an octave and fifth (or rather fourth down, as I caught the higher tone more noticeably) due to the resonance. Still training my ears, but I could tell it was off from a concert pitch note!

[@C_pico]

well, english isn't my first lenguage even I can undertand it pretty well. Since my brain is not primarly programmed in english my conclussions on many of this experiments are different in many ways

[@leoimpossibleisnothing1901]

How can you tell??​@@LeviticusStroud

[@sylv256]

I recognized the shepherd tones immediately, and the illusion didn't affect me. It's kind of sad, but it's interesting how the brain can be trained to understand sensation more when it's necessary.

[@noooooo1426]

little joel put you to shame man

[@brandonbryant2480]

Was looking for this lmao

[@shaeisgae8952]

Not rlly, I came from Joel's video and sound A is clearly higher to me.

[@LlywellynOBrien]

​@@shaeisgae8952oh no, little Joel put to shame. What is Big Joel going to say?

[@truthwatcher2096]

lol of course most of the comments will say "B sounded higher to me", if A sounded higher to me I wouldn't comment just to say "yes you're right". Not to mention that many people couldn't even hear sound A because of bad speakers, what do you expect the comments to look like?

[@ymeynot0405]

@Veritasium Nitpick: In Mario 64 you need to collect Stars not Coins for the staircase.

[@itsthevoiceman]

Speed run nitpick: I'm about to end this man's whole career

[@James2210]

and you don't level up...

[@dot-256]

​@@itsthevoiceman YA-HOOOOOOOOOOO!

[@Andlekin]

What he said was so wrong, I wonder if he did it on purpose to trigger us... "Coins to level up" Bleh.

[@frododododo]

I'm hijacking this comment. The people who are saying Sound B is higher are either not aware that their audio equipment can change how they perceive sounds, or stupid.

[@AndrewMillar_Zim]

As a musician, sound A sounded lower, and sound B sounded like a chord with the same root note as A, the 5th and the octave,, and sounded higher because of the two additional notes, mainly the octave.

[@iang0th]

As a musician, I heard them as the same pitch, which makes sense, since the fundamental frequency was the same. B just sounded like a different "instrument," maybe a bit brassier.

[@jameshalldorsson9695]

I concur that's exactly how I perceived it

[@David-bp9lr]

same.

[@armelind]

Thats what I thought. I am also a musician and I produce music. I have trained my ears to listen for certain frequencies. And as for the jumbled notes on the song, I still only heard jumbled notes the second time because logically, it was the same and my ears heard the same thing.

[@K1mmo]

@@iang0th Had to get so far down to someone comment my immediate first thought, glad you did. Obviously heard the higher frequencies and the "made up" 50hz.

[@bartymurns]

<a href="#" class="seekto" data-time="650">10:50</a> I heard "low, high"

[@a5c0]

Totally wrong. It was obviously "high, low" 😆

[@GonzPaoli]

Same

[@cardshark38]

I heard “love pi”

[@jerramoshea8164]

Left right for me 😂

[@dontcomply3976]

I heard 'contact'

[@topherthe11th23]

<a href="#" class="seekto" data-time="350">5:50</a> - This makes sense, and I shouldn't ever have let anyone talk me out of believing it. Suppose you play a note with a frequency of 100 cycles per second. Every 100th of a second, the same pattern of pressure in the air repeats. Now suppose you play a note with a frequency of 150 cycles per second. How often does the pressure-sequence of the TOTAL of the two notes repeat? In 100th of a second, the first note cycles one time, and the second note, going faster, cycles 1.5 times. So at the end of a 100th of a second, the two notes are out of alignment. One of them has exactly finished one cycle, while the other one is halfway between its 2nd and 3rd cycle. At the end of the NEXT 100th of a second, the lower note has finished exactly two cycles, and the higher note has finished exactly 3 cycles. So they're not both in the same place, EXACTLY ending one cycle and beginning another. If this happens every time 2 hundredths of a second tick by, then it happens 50 times per second. And that result exactly agrees with the video at <a href="#" class="seekto" data-time="350">5:50</a>. The two notes being played (100 Hz and 150 Hz) are overtones of a note (50 Hz) that is NOT being played. And that note, low as it is, is the HIGHEST note of which the two played notes are both overtones. This video says that that means that you will hear the 50Hz "implied fundamental" even though it's not being played. I tend to believe this video, not the people who said it's caused by something else having to do with subtraction. (In this case their wrong math WOULD give them the same result, because 150 cycles minus 100 cycles IS 50 cycles per second--the correct result arrived by coincidence from the wrong calculation.)

[@peterdahl2952]

My father was in London during the Blitz, he told me you could always tell when a multi-engine aircraft overhead was German, …as they never bothered to synchronise their engines, so there was an audible beat. British pilots were taught to always synchronise them, …so just a single tone.

[@guntherjauch3161]

I think multipistonengines are out of sync on purpose. So there won’t be critical resonance in the plane.

[@peterdahl2952]

The engines will be out of sync unless the pilot consciously synchronises them. From what I understand, the British were worried that the beat frequency would cause unwanted resonance and vibration. I also read that the Germans thought unsynchronised engines made the planes more difficult to locate…

[@Angel_Bob_]

heard "High, Low" Me with auditory processing issues: Oh you can just ignore the other voices at a party, can you? Must be nice

[@geoffrey6000]

i heard high low as well, wonder why though as he said people sometimes hear words relating to things they are going through.

[@Audio_Simon]

I heard Low, High.

[@monkedonke96]

sucks

[@cupbowlspoonforkknif]

I heard high, low and I have auditory processing issues too. Just a coincidence? Ha.

[@yellowjacket5586]

I got low tide

[@Broetchen98]

I was once in a holiday apartement, as I heard high heels walking on the stone floor. I slept in a big kitchen with a bed in it. Because I was not the only person in this Building I thought: maybe it's just a neighbour, which came home. But after 30 Minutes the sound was still there. It came from the hallway. So I stood up, walked to the door, opened it and saw nothing and no one. I stood still and listened again. The footsteps where still there, but they didn't came from the halway. They came from behind me, from the room I didn't slept well afterwards. That's due to the footsteps returning every night, now knowing they originate(d) from inside my room. On the last day I cleared out the fridge, next to the door to the Hallway, and I heard: High heels walking on the stone floor, inside the fridge. It turned out the compressor didn't work well anymore. ANd that's what made that sound. As I knew what it was it didn't sounded like a person walking in high heels on stone floor. But because I didn't knew how a broken compressor sounds, my brain made a person walking in high heels out of it.

[@rakeshgadhawe4550]

😂😂😂

[@michaelfink64]

Who else was waiting to read about the ghost?

[@emergentform1188]

Love this, and that organ is wild!

[@Josh-yr7gd]

13 years ago, my right ear became very clogged with dust and ear wax. It had louder ringing and I could barely hear out of it. When I went to a house dinner with about a dozen people talking at the same time, it was very hard to distinguish who was near and who was far. It was also challenging to listen to just one person. I realized then that our ears also have a depth perception similar to the way our eyes do. Things become flat when only one is being used. I’ll never forget that experience. I eventually went to the ear, nose and throat doctor and they gave my ear a proper cleaning and it was back to normal.

[@chuck1804]

A hero's journey.

[@810PRODUCTIONS]

I had the same experience with my right ear. I suffered from an obnoxious ringing for six years. Naturally, I assumed there would be no easy fix. One day my Q-tip pulled out a little bit of blood. The next day a girl at a small doctors office cleaned out my right ear, which felt amazing and dislodged a black waxy mess. I assume the black was due to my smoking. It was like my ear was kept in shrink wrap as a collectors item, then finally opened on that day and I could hear in HD. The ringing was gone within two days. Such a simple solution for a severe six year sleep depriving problem.

[@orangebeagle3068]

Many animals have similar capabilities with their nose where each nostril leads to a different nerve and they can smell “in stereo”. I wish we could do that too.

[@810PRODUCTIONS]

@@orangebeagle3068 All receptors have a distance between them, so they are all, in a way, a field of Dolby surround. But our brains tend to clump such clusters of inputs into one sensation.

[@TheReaverOfDarkness]

Me learning that other people have hearing depth perception: "wait, what?"

[@BenKerswell]

As a pipe organist myself, I’ve explored this topic extensively in my free time. Great job making it so accessible!

[@Makri9]

I really appreciate the audio cue towards the end of all veritasium videos. Very soothing to the brain while preparing us for the conclusion.

[@Ben_D.]

This was one of your best mate. Good job. (personally thought it was better than the black ball thing.)

[@neutronenstern.]

<a href="#" class="seekto" data-time="26">0:26</a> I actually heard that sound A and B both have the same note in common, but sound B has something added to it. The thing is, that adding higher frequencies also adds a beating to it. This beating has a lower frequency. And this is what might makes you think the note is deaper.

[@twist197]

Same. Are you a musician?

[@tylerfb1]

Ahhh! There's the words I needed to describe what I was hearing. I'm like, I know what they're getting at, I can like intimate it, but can't physically hear it. I physically hear all the different overtones.

[@dan725]

Yup, and that part is explained so well @7:03!

[@evenjohansen4584]

Same here🤠 (singing in a choir for many years might have something to do with my result ^_^)

[@neutronenstern.]

@@twist197 playing the piano and studying physics. My parents are music teachers

[@pastelthedevil2662]

bro has done 14 different titles and 62 different thumbnails. Optimization is a never ending task as they say

[@DannMeza-ck1ez]

AI generated titles working at 120%, it really helps 🙌🏼

[@artugert]

Actually, just 8 titles and 8 thumbnails.

[@AbhishekSingh-ly9gi]

Overthinking

[@brine1986]

Today I learned people can actually hear each other at cocktail parties. <a href="#" class="seekto" data-time="848">14:08</a> 100% impossible I pick anything from that noise

[@gamebuster800]

Same. This matches my "real life" experience where I just can't understand what anyone is saying in a busy room.

[@davidgro2000]

Yeah, I just immediately lose the one voice after 14:21, and he calls that 'easier'.

[@lightinthedarkd]

22:57 ... yep, they do sound like a total mess which is why I prefer smaller gatherings with at most 2 parallel conversations

[@the64threalm]

I couldn't hear the person either

[@preevetElizabeth]

Yea that whole time section reminded me why I never go to large gatherings

[@YodaWhat]

The overtone illusion thing was used in early transistor radios, and maybe still is, whenever they are limited to a small speaker. The way they do it is to purposefully distort the audio signal at the lower frequencies, to create extra harmonics. For instance, over amplify the low frequencies to create clipping, which is square waves, and square waves contain all the odd numbered harmonics. It is generally sufficient to have just the odd numbered harmonics.

[@dalyxia]

<a href="#" class="seekto" data-time="1379">22:59</a> "a cocktail party would always just sound like a complete mess" yep, thats what it always sounds to me, i cant for the life of me hear anyone in a noisy environment.

[@harpintn]

That is the way I am. and if I stay in that type of environment for more than 45 minutes I get a bad headache.

[@MacrosBlackD]

That's what ADHD does to us... I've never been able to enjoy a drink with friends because I can't hear anything what they're saying most of the time. It's truly insane.

[@silverbluewolf406]

I’m guessing it’s part of my adhd But i Find it extremely hard to isolate a single sound in a “noisy” environment This makes it very hard to talk to people in a room of multiple people talking as all of the sounds (including any traffic noises or birds singing outside) sound to be roughly the same volume when i hear them If i’m not directly trying to speak to a specific person it causes discomfort after some time and if i can’t take a break can even lead to a panic attack

[@dalyxia]

@@silverbluewolf406 yep, i was diagnosed with ASD when i was 18.

[@Sopel997]

yep that's how I realize I may have some auditory processing issues. Even that isolated left ear voice I just can't do.

[@josephvanderpool3407]

As a physicist and organist, I really loved this video, thank you! I hate to be this person in the comments, and please everyone hate on me if I'm wrong, but I think your explanation of resultant tones is actually not (entirely?) correct. Your ear can always hear the difference between two frequencies perfectly. For example, if you hear one tone at 440hz and one at 441hz played simultaneously, you will hear a 1hz tone as the peaks of the waves line up and cancel each other out. Thus, if you play one tone at 440hz and one at 660hz (The perfect fifth above), you will hear a tone of 220hz (the octave below) as the peaks line up 220 times per second. If you have a tuner or sine wave generator, try this out. It's great fun! It is not a matter of overtones at all, rather peaks of sound waves amplifying and canceling out each other. The fact that one note is a harmonic of the other is irrelevant. But please don't take this in the wrong way, I loved the video and just thought you might enjoy knowing this!!

[@friadoonhemmat2963]

Amazing

[@raam1666]

This makes much more sense.

[@Photosounder]

What you said is totally wrong, the video got the beating correctly. The beating is not a tone, there's no 1 Hz tone being generated (when you add two signals their spectrums are also simply added, so you still only have two tones), there's two tones, 440 and 441 Hz, and their envelope has a 1 Hz beating cycle (although technically it would seem to pulse twice per second), but there's nothing AT 1 Hz. Btw you will perceive this as a 440.5 Hz pure tone beating, because it's the same thing. Likewise with 440 + 660 there still won't be anything at 220 Hz (and you won't perceive this as beating), it's all a matter of perception, you MAY perceive both tones as being harmonics of a 220 Hz tone that isn't there (it's not that weird, plenty of instruments have their base frequency missing), although if they don't start playing together you might perceive them as being part of something different.

[@raam1666]

@@Photosounder You're so wrong that I'm laughing.

[@therealjibrano]

arent overtones just a fancy way of saying "peaks of sound waves amplifying and canceling out each other"? also im a physics major dropout (not my choice, but as soon as i can im going back) and also a self taught musician. it's always nice to see fellow physics people on here!

[@batchampa]

I have audio processing disorder. I had a hearing test recently that showed my hearing was excellent, but, especially in a noisy environment, it takes a while for me to figure out what someone is saying. It's easier if I can see their mouth when they are talking. Sometimes, at first I think I haven't heard them, and I say "huh", but then suddenly what they said comes through in my brain and I can respond before they've actually repeated what they said. This is more common in a quieter environment where I just wasn't expecting something to be said It's like my brain has to kick into gear to make sense of what it's hearing

[@luisdorador8676]

What do you call all this? Pretty sure I have it

[@Gennys]

It's been explained to me to think of it like our brains have to do an extra step or that a fundamental step in the process simply has a time delay. I heard everything you said but I need more than instant time to let it process.

[@andykins118118]

I have this exact experience all the time. What's the disorder?

[@FirstnameLastname-jd4uq]

@@andykins118118auditory processing disorder

[@cubertmiso]

pretty normal. no need for brains to kick into gear, alas mystifying it for some reason.

[@SD-cf3tj]

the "almost" part of the title is well placed. Some things worked for me, and others very much did not. Although I will say, going back and trying it again changed my experience/result. Likely because my brain was expecting/primed.

[@MonkeMountain]

<a href="#" class="seekto" data-time="83">1:23</a> I thought skin was the largest organ

[@haniiiff]

You god damn right 😎

[@scisher3294]

Based! 😂

[@omgrapist]

My skinflute is my largest organ

[@forasago]

Actually my [redacted]

[@erik4177]

Die haut ist kein organ

[@jadenschalck8640]

*Plays two really quiet sounds* "Put on headphones for the full experience." *Incredibly loud organ*

[@FinneasJedidiah]

The sounds weren't really quiet with headphones. Must be something with your speakers not being able to play those sounds well

[@IMelonBeats]

@@FinneasJedidiah doesnt change the troll of palying a loud organ after getting you to put on headphones. xD

[@TallicaMan1986]

@@FinneasJedidiah I don't know what it is, but something is going on with youtube sound and things aren't being put in limiters and or volume checks aren't happening. The Organ is loud and thats just a fact apparently on recording and off recording lol

[@infinite4809]

du du du DUUUUUUUUUUUUUUUUUUUUUUUUUUU

[@muhammadhammadkhan6830]

<a href="#" class="seekto" data-time="55">0:55</a> Derek: If you have headphones handy, I'd recommend putting them on. Me: (already wearing earphones, turns volume up just to be safe) Editor: (puts church organ clip next at full blast)

[@EHLOVader]

🎧 💀

[@hotflashfoto]

I like this video a lot. Especially when hearing the higher harmonics being played and yet "hearing" the lower note! At the end, the wrap-up seems to point a listener to conclude that our brains developed on their own. Seeing how complex they are, it's much easier to conclude that they were created. Couple that with the advert right after where it wants you to use critical thinking skills and one might be led down the path of wanting to believe in evolution. My critical thinking skills tell me to look at how something is designed and then ask who the designer is, not assume that it just happened by chance.

[@RishabhTiwari-hs4xk]

It thought sound B was higher

[@tuttebelleke]

same

[@BrandonDyer64]

Same. And no amount of mental parsing made it that way.

[@brando3342]

Sound B only sounds higher if you mentally parse out the separate tones in your head. You CAN hear the higher frequencies, but the 100 HZ in sound A (the lowest frequency in sound B) does sound "higher" than the 100 HZ in sound B. Concentrate on the "lowest" frequency in sound B and you'll see what I mean.

[@viethoangtrantrinh6519]

I think you confused high vs loud

[@VoidSinister]

​@@brando3342 this.

[@brianknight8195]

This is how low sub bass is synthesized for smaller speakers digitally. Very nice! The drawings of how it’s done brings it home too. Well done.

[@SamHe-nm8sz]

the pipes at <a href="#" class="seekto" data-time="200">3:20</a> looks like 🗿

[@kiwi_2_official]

fetoid

[@daffatahillah]

🗿🗿🗿🗿

[@senku_z1]

🗿🗿🗿

[@LoftyAssertions]

The fascinating thing to me is as a musician, I could easily tell Sound B is polyphonic with multiple higher frequencies, I wonder how far this training extends, the crossovers of the Sheperds Tone was quite clear too.

[@The_SaneHatter]

"most of us can do this" referring to listening to a voice in a crowded room... meanwhile me just nodding hoping I'm not agreeing to something heinous.

[@IlIlIlIlIlIlIllIlIII]

Me with tinnitus, NIHL and binaural hearing loss: *intensely staring at the mouth speaking*. Crowded rooms or rooms with music playing in the background create a wall of white noise for me, I completely lack the ability to pick any sound out.

[@pXnTilde]

Once the noise floor gets to a certain point I'm basically deaf to voices. About the level of a busy fast food joint I'd say. I can keep up if I don't lose the context mostly because my brain matches what I do catch with what it's predicting. As soon as that's off, just nod and smile

[@vojtechzeller8364]

Great video overall. As mentioned in the video, this ia very much affected by your skill in that language. As a non-native English speaker, picking out the voices in the presented "cocktail party" example was really hard, although I suppose I could do that in my native language.

[@Emmanuel_Rocha]

@@vojtechzeller8364 I'm native in both English and Spanish, and still couldn't pick up anything. But interestingly, I'm autistic, and whenever I'm in crowds I get very easily overwhelmed by all the noise because, to me, everything is the same plaster of noise. Which is very, very stressful.

[@kitkatkk2]

me: hold my autism

[@fredesch3158]

<a href="#" class="seekto" data-time="860">14:20</a> as someone with audio processing issues I feel personally attacked by this LOL

[@rzezzy1713]

Same, it's mostly verbal processing in particular for me. I couldn't do this for the life of me.

[@juliasteam2077]

I couldnt follow anything either

[@vincentvanzwietenOFFICIAL]

Yea this was impossible to me. Can't even do it in the example where the captain is speaking all the way to left and other sound is coming through the right. Can follow it in the beginning, but I get so distracted by the other side because I can't filter it out, especially with the bump in volume present on the right side voices.

[@yummyjackalmeat]

I'm deaf in one ear so it's also hard for me to focus on sounds.

[@HubcapPointOutdoors]

Same... I can hear a pin drop across the room if it's quiet... Let the ac kick on, it's time to turn on subtitles

[@nmccrear1299]

As an organist, Veritasium very really pulled out all the stops with this one!

[@BuzzaB77]

🤦

[@nmccrear1299]

@@BuzzaB77 it had to be said lol

[@kyttraus]

We see what you did 😊

[@biggles258]

Oh, very good. Chapeau!

[@ardenanderson5051]

You bring so much knolage to the world and many people appreciate it

[@Account81658]

In the next video, Derek should commit to the bit and describe Super Mario 64 as the game where you play a blue hedgehog that has to run really fast

[@bevinwalker1639]

ok

[@cowcat8124]

That would be awesome

[@samoraei7579]

At <a href="#" class="seekto" data-time="776">12:56</a> I thought the balls were bouncing off of each other until you mentioned that they were going through each other lol

[@plackt]

@samoraei7579 that’s not uncommon. I work in a lab that studies this phenomenon (the stream-bounce effect) and, for me, the version in this video also appeared very bouncy. We usually work with a purely horizontal stimulus motion, and sometimes get people who are very “streamy”, even with the sound.

[@kushanchathuranga2707]

yeah, me too..

[@urgay1992]

For me I could not get that one too look like it bounced to me even when trying to. The sound effect didn't help but I think that was because my Bluetooth headphones added too much delay.

[@randomguy1371]

​@@plackthow often do you see balls bouncing off each other in the lab? I rarely see my balls bounce off each other at work

[@toxic5628]

<a href="#" class="seekto" data-time="4">00:04</a> - Am I misinterpreting something? I'm hearing sound B as higher... <a href="#" class="seekto" data-time="617">10:17</a> - Hearing "priot low" (was unable to hear anything more meaningful). <a href="#" class="seekto" data-time="671">11:11</a> - First time without looking at the text - "Lattice is in person" :D <a href="#" class="seekto" data-time="740">12:20</a> - Without looking - "bear"; looking at the video - "there." <a href="#" class="seekto" data-time="845">14:05</a> - First time listening - I isolated the voice when I heard "so bad" and "overhead bins." <a href="#" class="seekto" data-time="887">14:47</a> - I tried the opposite, and it's a little bit hard to focus on your right ear. Maybe because the pilot on the left ear is speaking alone, and the sound on the right ear is a mix of multiple people speaking. <a href="#" class="seekto" data-time="1018">16:58</a> - So true and mind-blowing. <a href="#" class="seekto" data-time="1320">22:00</a> - Can't really hear the beating as before. It feels more like the sound is revolving around me very fast.

[@jrjubach]

The organ gentleman is so impish. Smiling upon each note, scurrying away behind a secret miniature door.

[@mkultraguineapig3017]

Pipe organ

[@zelwinters1981]

But he's so calm and passionate about it. Excited, even!

[@williammatthews7735]

Impish is not a compliment, at least not to an American

[@kj_H65f]

​@@williammatthews7735in this case you can tell its clearly a tern of endearment. I'm an American and I get the comment.

[@TheKhopesh]

<a href="#" class="seekto" data-time="705">11:45</a> My favorite is "Why would any parent ever name their kid Crisp Rat?" A guy who didn't realize the actor's name was Chris Pratt actually asked this. (Granted, I'm paraphrasing as I only partially remember it, I remember the basic gist/context but not the exact wording of what he said.)

[@iamthebroker]

Your references to Chris Pratt and Crisp Rat need to be other way around. Only way it makes sense to me.(it’s now been edited)

[@ChrisPonate]

Knowledge is power, france is bacon.

[@arnavsaxena4278]

@@ChrisPonate some people thought it sounded like the former british high chancellor francis bacon, which would be very wierd indeed

[@ChrisPonate]

@@arnavsaxena4278 What? that makes no sense...

[@DoomsdayMayBeOkay]

That Pipe Organ is such a magnificent work of art, i'm want to know everything about how it was built.

[@AutPen38]

It was made from the pipes in Super Mario Brothers. All pipe organs are made by plumbers.

[@md.mohaiminulislam9644]

<a href="#" class="seekto" data-time="1251">20:51</a> the transition was smooth!

[@x3-PC]

I hear her saying "Low" and the other saying "High", the word "Low" is said in a low tone of voice while "High" is in a higher pitch. <a href="#" class="seekto" data-time="617">10:17</a>

[@tabbitee]

Same here! Low and high a third apart

[@RichardFineAustralia]

Same here

[@nanopi]

Fly Lung

[@Hris4eto]

10:17 on the left i hear tie low and on the right low lie

[@cluelessturlte1512]

<a href="#" class="seekto" data-time="872">14:32</a> yeah no. It was NOT easy to distinguish different sounds when they are mixed up.

[@tspamtyahoocom]

The isolated voice should have played a bit longer so our brain could have locked in on it.

[@user-white007]

@@tspamtyahoocomI still immediately followed ny to cali worst flight over head full. Definitely couldn’t pick ever word out first listen but it blew my mind

[@kevinrey9427]

Not even a little bit easy lol

[@kubixus]

Sound B sounds higher to me.

[@brandoloudly9457]

Same. Maybe phone speakers vs other stuff

[@Aahir.]

He meant high as in which one has a higher frequency not sound. Sound B clearly has many chops which sound A does not so to anyone sound A should be higher .

[@kubixus]

@@Aahir. There's no such thing as higher sound. Obviously we know he meant frequency. And to me B is clearly pitched higher than A.

[@IWntGhost2YT]

Did you know that if you dig a hole, it makes a hole?? 😱😱😱😱😱 how did I solve this? I’m such genius. Aka these videos in a nutshell 💀

[@lastnamefirstname8655]

same to me!

[@cgbach]

This guy is incredible. And that organ player loves what he does!

[@gregorcutt1199]

<a href="#" class="seekto" data-time="770">12:50</a> So now I feel less stupid that sometimes I need to put my glasses on to hear people.

[@phaZZi6461]

i feel you

[@MrTubeuser12]

I'd be completely blind if I had no ears...my glasses would't stay on LOL

[@Beryllahawk]

Also why I struggle sometimes with phone calls, especially if there's a lot of noise on either end of the line.

[@sharondesfor5151]

20 years ago in my early 40s, my husband said something to me and I replied without thinking, "Hold on, I can't hear you without my glasses." We laughed about that for a long time, but it's never become any less true.

[@super0nofa]

@@RockBrentwood For me the "bear/fair" one does work but with the circles I see them passing through each other whether the sound is played or not.