42 Audio Illusions & Phenomena! - Part 1/5 of Psychoacoustics

[@CaseyConnor]

BINAURAL BEATS: First, note that some people (not most) don't hear the binaural beats at all, or do hear them at the higher frequencies, and AFAIK (I'm not a doctor) that's just part of normal human variation and doesn't mean you're about to die or that there's anything wrong with you. Lots of people have commented here with experiences all over the map. (Also some of that is no doubt due to playback issues -- see below.) Understand that "beats" are not the same as binaural beats. E.g. what you use to tune a guitar is just "beats". The "binaural" part only happens when the two tones are presented separately to each ear. If you hear the beats through your speakers, that doesn't mean the demo worked on your speakers -- it just means that you heard regular beats. You need to listen on headphones or earbuds to try that demo. There have been a lot of comments about the binaural beats working or not working when they should or shouldn't -- one issue seems to be that on some systems (not sure if it's some versions of the video that youtube serves, or an operating system configuration thing, or an audio playback system thing, or a headphone thing) the left and right channels are "polluting" each other. In the actual audio there is only a single tone in each ear at 2:20. If you take out an earbud (and if you're sure you can't hear the earbud you took out through the air at all), you should definitely hear no beating at 2:20. You can test your system by taking one earbud out and playing from 2:12: when the audio plays one channel and then the other, you should hear total silence in the single earbud for one of those tones. If you hear even a little bit bleeding through, it means your system is not separating the channels properly (and in fact this may explain a lot of the cases where other illusions in this series don't work!) Even my Focusrite Scarlett 18i8, a dedicated prosumer audio interface, has bleed between the headphone channels (but not the speaker channels). I wish I knew this was so common before making these videos. :-) Try finding a playback system that isolates the left/right signals perfectly at 2:12, and then watch the videos again. You also need to listen to the 720p version or better -- the lower-quality streams degrade the audio (including the stereo separation). I'd also appreciate reports under this comment about whether your system does or doesn't perfectly isolate the left/right channels on your headphones. Similarly, the McGurk effect depends on accurate audio/video synchronization, and A/V synchronization (on basically every system and operating system and device outside of an acoustics lab) is a total disaster. Also wish I knew that ahead of time. :-)

[@pilotavery]

Hello, I did confirm that the sound is isolated, but funny enough, my wife and I both heard the beating very clearly. There was no mixing of sound, either. We're both very autistic though, and very sensitive to all stimulus and respond very differently, so I am assuming that is why.

[@beeopper]

sound is isolated in each ear, can hear 2 different pitches, however when played together I only here one tone not any "beat"?

[@pilotavery]

@@beeopper Above 15khz, others can't hear beats where I can. If you mean you can't hear the beats at all, when isolated, you may just have audio processing issues

[@beeopper]

@@pilotavery I have no idea what you are on about, in my head phones the right tone is different to the left tone but when played together in the video is hear one tone not the beat like the video says?

[@pilotavery]

@@beeopper if that happens above 15 kilohertz that's normal

[@Redinator]

Ah, yes, my good friend tinnitus. Not a night goes by without a constant _eeeeeeeeeeeeeeeeeeeeeeee_ in the dark.

[@CaseyConnor]

Oi, tell me about it.

[@TwentyTwoThirtyThree]

Gents....I think you just informed me that I have tinnitus....I just assumed everyone had that constant ringing...

[@slipsonic809]

@@TwentyTwoThirtyThree That's how I found out too haha. I had it since I can remember. It only bothers me if it changes tone, which it does sometimes when I'm really tired or some other unexplainable reason.

[@jajwarehouse1]

@@slipsonic809 I once concentrated in a very quiet room and started counting the various tones that I hear, and I lost track at well over 100 different frequencies.

[@TwentyTwoThirtyThree]

@@slipsonic809 I know exactly what you mean, just hanging out when the time completely changes frequency for no apparent reason...how odd

[@carykh]

I remember I would experiment with beating in my high school orchestra class. The teacher would play the 220 Hz tone on the piano for the students to tune their instruments, and I would try to hum something like a 225 Hz note in my head, to try hearing the pulsating effect in my skull. But maybe that's why my violin was always out of tune...

[@idktj10]

Hi

[@HH-mf8qz]

Hi Cary kill hitler

[@DerFliegendeMocca]

you cant wobble a note in your head to create a pulsating effect. you can imagine a wobble, but the true wobble needs to physical waves to interfere.

[@uberwhaleblubber7007]

He lives!

[@newyearsday7304]

So it's not just me?

[@SamChaneyProductions]

I'm going to make a track with an increasing Shepherd tone over a Risset beat and it will give everyone on the floor a panic attack

[@KimStennabbCaesar]

Suggestion for genre: Hitech Trance

[@randomdude189]

It’s been done. Music festivals where they test new music to tripping people lol

[@Sp00kyBones]

So what your saying, is that your want to cause a panic at the disco?

[@Womblewobble1321]

Made one in phaseplant they sound so frickin awesome

[@lukedavies9708]

That's the most evil thing ever, I love it

[@TEJR69]

about that last part ... as a kid I was learning how to play a piano and I really often told my teacher I heard this weird almost like a "white noise" sound in my ears at all times. There has not been a single moment I've not hear that for my entire life... She told me it's just from the loud sounds that piano makes, but I tried to explain I hear it all the time. When I'm outside, at school, in bed, all the time. I then talked about it with my mom and she took my to a doctor that inserted numerous things into my ears and they played various tones. From really low freq. to really high and ear tearing ones. I remember sitting in front of a monitor and since I was a kid, the doctor told me we are gonna play "catch the mole" since the little spectrum of the sounds on the monitor made little hills like a mole does on your garden. The point was just to entertain me so I always looked at the monitor and told the nearest number to the center of the little hill. I remember I went there couple of times and the last time I was there he inserted these little things into my ears, played the tone and ... The "white noise" was gone. He then turned it off and just looked at me, I could hear it again and then he talked with my mom for about 20 minutes while I was there sitting confused, how come did I not hear the noise for the first time? I don't remember WHAT EXACTLY then they told me, it's been so many years and mainly I don't really know how to translate diseases into english from my language so I'd have to look that up too... BUT! I stayed with music and kept playing the piano for several years, then high school came up I started playing drums and my friend invited me to a practice where he learns to play drums. They had this "anti-noise" booth for playing any kinds of instruments and it was the quietest place I've ever been to, apart from that white noise. Everyone who went in there with me, told me they hear literally NOTHING. So I just threw around "Not even the white noise in your ears?" And everyone threw me a weird look like what am I talkin' about? Years later I got to know it's pretty normal that people hear this kind of a white noise in their ears, but in my case my ears have another weird thing going on, where additional to that white noise I still hear that one frequency at all times. For example if I'd try and fall asleep without NO SOUND in the background? I just can't do that :^) If you put me in a bed and there is no sound around me I won't fall asleep until I'm really really tired ... Over the years I've learned to listen to whatever I can on my phone. I put one earbud into my ear, play someting on my phone really really low and I fall asleep like a little baby, but if by any chance I have to sleep somewhere where I can't do that or there is nothing to listen to, I ain't sleepin'. It's been a real problem for me over the years, almost my whole high school there wasn't like single day I came to school rested, when I started to work my first work was really shitty one and I was there for 4 months, every single shift I had I was sooo tired until my boss thought I'm doing drugs and fired me. Then I took a job at a hotel as a receptionist and it was the same story, so tired through out the day and I got weird looks from people I worked with, BUT then my boss came to me and asked me if I could do a whole month of night shifts since the girl that was doing night shifts was scared because some drunken asshole came to the hotel and ... well she was just scared to do them anymore. So I agreed and it was perfect ... whenever I came from a night shift I was so god damn tired I always fell into my bed onto my face and passed out. I worked there for 3 years and never had a day shift ever again... then I changed my work where I'm now for 2 years and I'm doing night shifts only ... I'm actually "working" right now while I watched the video and wrote this whole essay. So yeah, my ear hears this one frequency at all times (or produces it I still don't really know) so I don't know what DEAD SILENCE is like...The one time I heard absolute nothing was at the doctor when I was like 6? Well, I don't even know why I wrote this, have a wonderful day and thanks for reading my stoopid story I suppose :^)

[@scogin2670]

I've been told it called tinnitus. I always hear either a sound like a diesel engine revving up and down way off in the distance, or I hear what sounds like a sink that's barely turned on. It's irritating when I have to ask someone to repeat themselves and I have to explain that a hearing aid wouldn't help. My hearing is fine, I just can't hear over the other noise.

[@edwardclark6731]

I had ear purring. It went away, and never comes back. One day, it was absolutely deafening. i couldn't hear anything over a loud "Purr"

[@orchdork775]

​@edwardclark6731 I get that a lot. It's like a flutter in my ears that causes an uncomfortable sensation deep in my ears. I can actually make it happen intentionally by flexing certain muscles in my ears, but for a while now it's been happening on its own. I think I'm just getting muscle spasms in my inner ear. It can last for hours once it's started, and it goes between constant spasms back and forth, to a few seconds between each spasm. Muscle relaxers help, thankfully, so I can take them when it gets bad enough. Apparently, grinding your teeth can lead to issues with the joint in your jaw, which can then affect the muscles in your ear. I grind my teeth at night and have issues with my jaw, so I'm pretty sure that's the cause. Maybe you also have that.

[@kdoshimmusic]

I've never been able to sleep in silence either because it's too loud 😭 the quieter a room is the louder it is for me i just always listened to music sometimes i get this weird feeling too like music is uncomfortable and too loud even if it isn't like some songs i think have certain tones that make me hear weird sounds if that makes sense i completely feel what you're saying bro and idk what it is either but i honestly until reading your comment just thought it was normal 😭

[@codywhen]

Someone should make horror music with this where it sounds like the killer is getting closer and closer but never arrives

[@mr.manifestor]

You got it! It'll be available on my channel soon! ✌

[@tictacmaniac7415]

Christopher Nolan used one of these in The Dark Knight, where the sound in the background gets more and more intense without actually getting any higher/lower. It's just our ears that think so :D

[@salomahoney2675]

What you're thinking of is utilised in lots of music in horror movies! :')

[@gatufelpudu5767]

love how it ends with “stay tuned”

[@DanX2M]

Tune

[@classofrass5752]

DUDE! SPOILER WARNING!

[@motifity3416]

I *hear* ya.

[@seinfan9]

That's the literal original usage. When commercial radios were getting more popular and programs became a thing, the host of the shows would tell their audience to stay tuned to the station while between commercial breaks so they wouldn't miss a second of the show.

[@onearthonelegion]

Same bat channel?

[@letsplaysquire3257]

"Going to need headphones" *Sat here with headphones on mono as I'm profoundly deaf in one ear* "Alright! lets see shall we?"

[@dcuoscissorkickz1614]

Let's see!! Lol 😆

[@emigogo8059]

I'm partially deaf in both ears. My left is worse than my right ear.

[@c0smic_cr0w]

This made me chuckle because I'm doing the same as well

[@SignalsMusicStudio]

This series is an INCREDIBLE resource for any serious musician or producer. Can't find this sort of info any where else compiled into such clear examples. Pure gold, excellent work, and thank you!

[@YoBoof]

soo true me as a musician it is very interesting to watch/hear!

[@rubenvela44]

I need to study this because I am accidentally making audio illusion music

[@crcaccounts]

Gold Jerry, GOLD!

[@spirosyeros221]

The sound at 2:15-20 didn’t best for me I heard the combination without a beat….

[@devinsatterfield2642]

V

[@Missingo32]

The coolest and most effective use of Tempo Circularity that I've heard is in the song "Emergent One" by Comaduster. The tempo sounds like it continuously slows to an utter crawl, and then some, yet ends up at the exact tempo it started in. Yes, once you break it down, it's just a clever trick, but it's done effectively enough that your first time hearing it, you don't realize it until it's already happened. And even knowing what's happening, it's still a really cool effect, imo. If you don't mind electronic music, it's worth a listen. (timestamp after the break) (It occurs around 1:48 into said song, for the impatient)

[@gergelykasza5351]

I think you should listen to Autechre - Fold4, Wrap5 the whole piece is "tempo circularity"

[@kylemcdonnell86]

Not just great information, this is also a great example of voice over with very pleasing, well-recorded reverb.

[@fabricioteixeiradasilva2720]

A nightmare where a circularity effect is playing loud and forever in your head

[@connormccullough2226]

Incomplete sentence

[@fabricioteixeiradasilva2720]

@@connormccullough2226 ??

[@daoofpotato7238]

You mean tinnitus?

[@Termenz1]

@@fabricioteixeiradasilva2720 he probably means, that you just mentioned a nightmare, and described it, and didn't say anything else. It's like saying a random word without any context, but wider. I guess you just have to insert "imagine" before your sentence and the nazi will be fine.

[@Muffinmurdurer]

hell circus

[@Rob-rs5rn]

For some reason, after watching this, I feel so blessed to be able to hear. My whole heart goes out to those who have no hearing.

[@atlantic_love]

Did you ever figure out that reason? We don't need your heart.

[@bashkillszombies]

If you didn't write this they wouldn't know they were missing out on anything, jerk.

[@moretrash4you]

@atlanticlove8883 You officially have the most random profile picture I’ve ever seen

[@SALAZANDERR]

​​@@atlantic_love stop being rude

[@xxxxyz854]

@@atlantic_love Have you always been an asshole or is this something new?

[@jordoneaton7083]

Tinnitus...wish I could forget that noise.

[@raihidara]

Hey, here's a technique that'll give you momentary relief when it gets too bad: 1. Cover both ears with your hands 2. Rotate them counterclockwise. Your thumb should be around your jawline and your other fingers should be at the base of your head. 3. Strike where your head and neck meet with your index and middle fingers. It should honestly sound like a timpani drum is being struck in your ear. Repeat this 30 times per ear (I alternate striking with each hand every second for a minute). 4. If you did this correctly, you'll now have perfect silence for a moment. It is only momentary, but it helps in the worst of times.

[@RFC-3514]

@@raihidara - While it does have a physical cause in a few rare cases, tinnitus is generally neurological, and physical manipulation of your ears won't make any difference.

[@raihidara]

@@RFC-3514 @@RFC-3514 I can't post the source due to an "unexpected error every time, but please look up Lifehacker's article "This Weird Trick Might Give You Relief From Your Tinnitus" which is where I found out about it.

[@vcrlord141]

if you focus in a quiet place, focus solely on quieting it down, it will work. I do this in the bathroom sometimes, as I have lived with constant tinnitus most of my life. It's a good exercise even if you don't have tinnitus, helps in stressful situations. Listening to "transamorem transmortem" by eliane radigue might help too, it's essentially a recreation of tinnitus, but oddly enough, it's like its scratching your brain of that itch that is tinnitus. It uses a few of the techniques here on this video. Hope this helps.

[@RFC-3514]

@@raihidara - Ah, yes, Lifehacker, the respected medical journal.

[@joshuadelaughter]

The first thing is a great example of why panning stereo audio is so important in mixing music. It helps make different tracks distinct by giving them their own space.

[@semnet3217]

10:41 IS THAT DESPACITO????

[@thomascorin7816]

Not even close. Hell, you'd be better guessing Stayin Alive

[@semnet3217]

​@@thomascorin7816brotha that was a year ago

[@aubry980]

are we not going to talk about how insanely clear and crisp Casey's voice is??? What mic setup do you have like jeez.

[@CaseyConnor]

Shucks, thanks. It was a while ago when I recorded it, but I believe it was a Roswell Pro Audio "Aurora" mic (no longer made) with a stand-mounted shield on a mic stand. And some basic processing in the computer, of course, including some iZotope RX magic to cleanup mouth noises and breaths and so on.

[@Kris_P._Bey_Ken]

Just you aubry.

[@underdogg87]

No

[@jwslyb6208]

its actually just an illusion

[@Martian891]

Yeah it's the editing not the mic. Any 100$ + studio mic will have this quality but it's more about how far away he stands, where the walls are in his room. What they're made of.

[@ailurophilekia6565]

It's been so many years since I last heard a Shepard-Risset tone and yet my brain still notices the transition without fail.

[@timisunu]

Cool ngl same

[@ItsMilla_]

Me too!

[@liamkirk770]

Binaural beats happen a lot when restarting a circle track race. Almost like the engines are running in time. It's super neat to hear and experience

[@horizoon]

fantastic video! I'm an audiologist an we learn a lot of this stuff but only in theory. nice to be able to actually hear these effects!

[@albertnortononymous9020]

The frequencies on the tritone paradox are a whole step apart, not a tritone.

[@CaseyConnor]

D'oh -- thanks for pointing that out. It was a rendering glitch having to do with the automation driving the synth software... I'll update the video description with the errata.

[@albertnortononymous9020]

@@CaseyConnor Glad I could help😊

[@the_original_Bilb_Ono]

I knew something was wrong! I dont have perfect pitch but good relative pitch, i knew that wasnt the tritone. I use the tritone alot in my weird music.. plus i have my guitar split into my headphones with this video, and i played the b5 over it.

[@SamChaneyProductions]

Yep, and the second one was definitely lower! I heard it as a re-do. I believe it was a slightly flat F then an Eb

[@tabacPL]

@@SamChaneyProductions actually the first one is a slightly sharp F and the second is a slightly flat Eb

[@Krebzonide]

On those infinite ones I can very easily pick out the "imperceptible" addition of new sounds.

[@calvinjewett8216]

me too

[@olik136]

I can also easily hear that- BUT my brain still thinks that it is continually speeding up or slowing down

[@TobiasJohansenMusic]

I thought the same. It was especially clear for me on the tempo one. I was more frustrated the fascinated becuase I could distinctly hear different tempi playing on top of eachother.

[@reverie5760]

if i focus directly on the descending tone, then it sounds infinite. otherwise, I can also easily pick out the addition.

[@flori5296]

@@olik136 my thinks it jups at one point.

[@geese5170]

The illusions are great, but it makes me most uncomfortable that there is an ever so slight reverb on his voice throughout the whole video

[@KrisS602]

Right!? I kept finding myself just focussing in on his voice again and again to double-check I wasn't going crazy. Kept hearing the time of the room, then would focus in and only stop briefly when I'd hear a bit of splash on the sibilance. Or the edits that ended without a room tail.

[@nyssalikesbugs]

jojo reference 😳

[@shaykireas]

what is reverb?

[@KrisS602]

@@shaykireas it make da "boom bap" go "booom baaap"

[@Zyn_Shi]

@@KrisS602 This is the best description ever

[@CrookedEyeSniper]

6:10 - The Tritone. AKA The Devil's Interval. 🤘👹🤘

[@AlexiBexi]

So good

[@eincrafter1047]

ach, wen haben wir denn da

[@derlukas2676]

Lol hi

[@jonathanlange1339]

Dieser Lümmel

[@mister_jbr1761]

heavy spannend irgendwie

[@Flec2507]

lol was machst du denn hier?

[@lukedstaten]

“Psychoacoustic” reminds me of the Portal 2 soundtrack

[@therm0tt0]

I often replay that game for many reasons including the soundtrack, story, characters, and humor. I found the complete soundtrack on Bandcamp. In case anyone is interested, it's listed as "Portal 2: Songs to Test By (Collectors Edition)" from Ipecac Recordings: portal2game.bandcamp.com/

[@wrightexe1]

Like when you’re on the propulsion gel and the music ramps up

[@ene_n]

@@therm0tt0 its available on streaming services and steam itself tho

[@ankapatos]

"There she is", "You know her?", "Music of the spheres", "Bots make bots" just a few of my favorite Portal 2 tracks - Great game, humor and music. I lost track of the times I've played it so far..

[@paulmurphy5244]

9:30.......Sounds like sumthin from a "Mr.Bungle" record!

[@thedukeofweasels6870]

This video might be about a auditory illusions but I stared at that Barber pole so long that my brain adapted to it and now it looks like my keyboard is trying to turn itself inside out

[@otesunki]

oh god

[@reotlhoaele2123]

When he said"even on an old smartphone with cheap earphones", i felt that.

[@ohno-wi1vb]

the risset beat that gets faster made me incredibly anxious

[@itsmexoxurmom]

sorry this is late but same omfg it speeds up my heartbeat sm

[@DiscoBallGaming]

i'm glad the Algorythym threw me here. this is nuts man.

[@Kerry1PRO]

For sure *mind blown*

[@yrmthr]

Its basic audio engineering

[@dcuoscissorkickz1614]

What's up nutsman. I'm dave

[@Kai_On_Paws_4298]

Algorithm*

[@Cleric_Guardian]

I need to use a tempo circularity on my D&D players. Give them that tension of music speeding up, but the tension never stops...

[@8546Ken]

When discussing the combination 2 or more tones, we need to be aware of the difference between linear and non-linear mixing. If we combine tones in a linear device or system, we may hear beats, but no new frequencies. For instance, when we combine 200 Hz plus 205 Hz, we will hear a 5 Hz modulation but not a 5 Hz tone. In other words, there will be a tone at about 200 Hz that is fluctuating at 5 Hz. Likewise with a 220 Hz tone plus a 330 Hz tone in a linear system, there will not be a sum and difference frequency created. This is why audio amplifiers and speakers are carefully designed to be very linear. I first became aware of this phenomenon when I visited a museum that had a circus air calliope, which is an instrument with very loud high pressure whistles intended to be used outdoors. I heard a lot of discordant notes that were being generated by the sums and differences. This is called "intermodulation". which only occurs at high levels. Radio engineers are very familiar with this effect on radio signals. Even air is non-linear at very high volumes (due to adiabatic expansion). I don't know whether the effect I heard was due to non-linearity of the air or of my ears.

[@mcmike89]

This video is the fundamentals of synthesis used in synthesizers when making music.

[@Ykulvaarlck]

there's this song from autechre's "LP5" album called "Fold4, Wrap5" which actually is entirely a risset beat

[@kalproc]

Link to Fold4, Wrap5: kzbin.info/www/bejne/rIbMoIl9psuobNU

[@Mercury-Wells]

Autechre's great - love watching tweekers try to dance to that shit 😄

[@JunkBondTrader]

deep cut

[@DrTasty18]

this shit was weird but I dig it.

[@kaspartambur]

Thank you for such a short to the point, with examples, of discoveries in acoustics, electrical engineering & psychoacoustics!

[@channelnotfound4061]

This comment is so the algorithm recommends this to more people. This is crazy.

[@gravesclay]

Band director, HAM radio communicator, musician, physicist, nearly all of my hobbies and professions have made me aware of these enough for them to not even happen, or to know what is happening and "listen the other direction". Super useful for tuning a band by ear!

[@jzero4813]

7:11 For the English side, UK power is 50Hz, which is somewhere between G and G#. In California power is 60Hz, which is around B. Weird if the dominant background hum somehow imprints onto the ear.

[@FlashDrive356]

For the 2000+ frequency I still heard a very fast beat.

[@zacmc8004]

Same

[@rodent62]

same

[@013A]

+1

[@Berranteromatadordenidalee]

me 2

[@dtibor5903]

You are not using a headphone or the headphone has crosstalk for some reason

[@RedGallardo]

You just made me 40% more paranoid than I was before. Thanks. This world is crazy. You're crazy. I'm crazy. And my cup of tea sounds crazy now.

[@accountone1727]

Lol 😆 ... quite a bit of anxiety leading to the paranoia.

[@yogidemis8513]

Calm down, it's going to be okay..........Maybe!!!!!

[@josefabian1133]

What are you talking about, the cup of tea sounds perfectly normal

[@RedGallardo]

@@josefabian1133 Don't side with him, he's gonna betray you in the end

[@TURAMOTH]

As somebody who produces music, a lot of these are fascinating, I've experienced the Binaural beats phenomena myself when messing with serum.

[@MichaelCoombes776]

Beating sounds absolutely gigantic if you use saw waves and I love it

[@lishkathedegenerate9066]

Yesss! I always do this!

[@notplaceerrorlol]

This is sometimes the same with vital

[@AfroBoi14]

The tempo circularity beat was the trippiest one by far. It kind of made me unsettled trying to follow it and pick out the different tempos. It reminded me of scary circus music or something I enjoyed it though! This whole video is incredibly fascinating

[@youwhenyouyouwhenuhhhhyea5794]

this is the first time i’ve ever been introduced to something like this and I love it. I was researching to find out how I could possibly make a track in a song I’m working on In garage band feel like a surrounding audio and then i stumbled upon this. Audio Illusions are so crazy cool and I think I’m gonna get obsessed with this soon lol. great video!

[@rogthepirate4593]

2:45 "And you probably don't hear a beat between them" Except I actually do. It's faint, but it's definitely there.

[@phoenix-qr3ln]

@Jonathan Tippy I can hear the beating very distinctly even when they are separated, about twice per second, even if I stop listening to it and come back after a while with no expectation or recollection of what the beat sounded like

[@richardsmith1780]

100% I can hear the beat...much slower but very clear

[@rogthepirate4593]

@Jonathan Tippy the frequency was pretty much spot on for me, it was just very faint.

[@darkcloud12345678900]

i could 100% hear it

[@LegendaryKenneth]

"You still hear a beating, even when there is only one tone in each ear". Seems this is not necessarily the case, as soon as you panned them the beating stopped for me.

[@gg1k]

same

[@s0lice]

Same for me. I'm using 7.1 headphones so maybe that has something to do with it? I don't currently have another pair to try.

[@JunkBondTrader]

If you focus on it, you can hear it, and it goes in and out for me. If I focus my attention to the "center channel" I hear the beating, if I focus on the side channels, (L and R) It blends.

[@SteveJones172pilot]

Me too. I have noise cancelling headphones on, and figured that was why, so I turned the noise cancellation off, but it still sounds the same for me.. Little to no beating. I'm going to have to ask my wife to listen and see what she hears..

[@PsychoSis1994]

It hasn't worked for me either. :( I even listened to it with one earphone out and added it back in when both tones were playing and just heard the two tones simultaneously with no beating.

[@tanderra8541]

Excited to learn these effects! I'm developing my game right now it has a heavy emphasis on sound design I hope I find something I can use!

[@tanderra8541]

@Ricky Still working on it haven't really got to the stage where I'm happy with with it as my life is filled with other stuff I need to keep track of (family and work). In fact something very soon could happen that will prevent me from working on it for half a year or indefinetly. It saddens me that I may have to release the game way too soon or otherwise it may not be released at all.

[@johnferguson4089]

Sound, and the science of it has fascinated me all of my adult life, that's about 60 years and I still discover new aspects of it. As a church organist, it is vital to understand harmonics and resultant tones. I have a fairly large electronic organ that I use at my church and just for the hell of it, I like to experiment. It just happens that the tone generators do not go below tenor C for the manuals and just for variation, on one piece that I play, instead of using a low 16-foot stop on the pedals I play that same part with my left hand on one of the manuals using an 8' plus a 5-1/3' flute toned stop (they are actually sine waves) and while I physically play just one note, two pitches a perfect 5th apart are heard which means that they produce a 'resultant' tone which is an octave lower than the note I'm playing. In organ terminology, it's producing a 16' resultant tone which sounds as though I'm playing a pedal. This same effect can be had on small electronic or digital organs just by playing the right notes using as near to the tone of a sine wave that you can get. Of course, you must also have a decent speaker system on the instrument for this to work also. Sound has always fascinated me and it's interesting to just listen to a rich toned sound while sustaining it while you pick out the individual harmonics with your ears. On many medium sized pipe organs, there is often a stop for the bass pedals called Resultant Bass 32' or Acoustic Bass 32'. This simply plays two flute-like tones together to produce a simulated 32' sound. Your ears provide the pitch of 16 hz even though it's not really there.

[@margithammer8835]

It's just like tuning your guitar. You know when the pitches are perfectly matched when the beats go away completely.

[@fredherfst8148]

Can even use a fifth to tune against..beat is still audible to me.

[@MelodyWarp]

I remember listening to examples of these illusions before I took critical listening/ear training classes and developed my ear for my B.S. in Audio Engineering. I remember being so amazed. Coming back to them now almost none of them work... at least not completely. My guess is the hundreds of hours spent troubleshooting issues that make things sound weird has turned into the ability to not only realize something is weird immediately, but *what* specifically is weird and the reason for it. I'll have to check out the rest of the series and see if there are any illusions that still work as intended for me. Edit: Definitely some just in part 2 that still affect me! Obviously the vast majority of things under the "Phenomena" category will affect most people, but I'm glad there's still some stuff under "illusions" that keep me feeling normal. 😆

[@levitoman3069]

For the first one I didn't hear it beating when they separated. Just a combination of notes on a piano.

[@MrZcar350]

Same.

[@LuckyFlesh]

I didn't either. To me it just sounded like they added some chorus effect.

[@smalin]

I didn’t either.

[@sh230968]

Me neither.

[@TobyIKanoby]

I can turn it on and off in my brain.

[@longschlongsilver7628]

I love how medieval monks had noticed the combination tone phenomenon centuries ago, which is why they're so common in old gregorian chant

[@jb-ik8sj]

My work has always required ear plugs. And i agree. When i visit any place outside city life, where silence is deafening, i clearly hear several high pitch tones. Not super high pitch but the octaves sometimes change. Ive asked people who were with me at times if they hear that. But they dont. Its not bothersome but definitely audible. Cool video

[@jaredfurr5596]

that barberpole illusion is ripping m brain into teensy little shreds... i love it. great video

[@jamessmith84240]

8:57 the sound of a bad trip...

[@lishkathedegenerate9066]

The music in my head is weird af

[@tdonbrow]

This was great. I had a few seconds of "quiet" where I couldn't hear my tinnitus. Thank you for that.

[@jay-rev]

THIS IS THE MOST BRILLIANT WORK ON SOUND IVE EVER SEEN OR HEARD. THIS SHOULD BE MANDATORY EARLY LEARNING FOR ALL.

[@proteanalias]

This is actually giving me flashbacks, its insane

[@akouo]

Great video, thanks ! About tinnintus, if my experience can help ... : As a sound engineer, tinnintus, when it appears, is very annoying. So I have been working deep on the subject. We hear through a very thin "harp" of so called ciliated cells. Think of it as a microscopic wheat field, where wind (aka sound) blows. Each wheat stem is irrigated by microscopic blood vessels. Too loud sounds (or aging) lead in permanently damaging some of the cells. Hence tinnintus. But most of the tinnintus I have encountered is due to a bad vascularisation of the cells. This one can be fixed : - by drinking more water - by reducing overall fatigue and stress - by eating less sugar - by correcting your posture - by easing the muscles of your neck and shoulders - by any kind of relaxation. For example, play this game : think of your ear as a cave (grotto), a labyrinth where you wander with a torch. You choose your way according to the direction of the tinnintus. As you approach, the sound gets louder and more clear. There, you find it ! You stay there, enjoying the found. The sound is pure and intense. The walls of the grotto are made of wax, and they begin to melt because of rhe heat of your torch. The sound fades out. (In fact, through focusing and relaxing, you have eased the way for blood into a ciliated cell) Soon, you will discover that other frequencies are ringing, and you go on chasing them in the labyrinth, until you feel better (or fall asleep) Other suggestion : think of your body as of the body ok the kid you have been : think how smooth and relaxed is every muscle. How easy your neck and shoulders move. How your eyes move rapidly, how your forhead is smooth, how your jaw is loose. And see : even your ears open up themselves, very naturally. You might experience a sensation of swalling. Let it happen ! It is healing ! Third suggestion : close your eyes and imagine they are falling in an infinite well (pit ?). You let them fall, offer no resistance at all. Feel how your eyebrows relax, your sinuses, your cheeks, and now, imagine your ears are two verical disks, under your skull. Two thick plates, like 15cm diameter and 2cm thick, centered on your ear holes. Every sound you hear is mapped on a point of these plates. Now, let the plates spin slowly, from the top to the front and so on. Let them go ease the movement and enjoy the dizziness a while. Feel how the plates get bigger as you focus on them. Let it fill all the space. Fourth suggestion : massage the very point where your spine and your skull meet, on each side of the spine, in the hollow where the muscles are attachee Last one, be cautious, this is medication and has to be approved by your doctor : one drop of Ravintsara per day on a piece of bread (boosts the bloob circulation) Hope it helps !

[@23UAS]

This should be recommended by KZbin to more people! Such a geat presentation of the non-trivial topic!

[@Kombivar]

Awesome stuff, feels like watching 3Blue1Brown but with different content - well done, visual, narration - straight into my favourites list.

[@TReyeHD]

First test makes my head spin. I knew it could mess with the brain but I didn't know how effective it could be.

[@ANDYWOUNDSABRXS]

that slow beat part was amazing, I couldnt tell what was happening for a sec. Such a good idea.

[@oneleggedturkey]

Wow, this is a great video. Thanks for making it. The pitch circularity forever descending was much like one of those visual illusions where you see either a rabbit or a duck until you know to look for both. Once I understood what was going on the illusion was broken and I could pick out the higher tones being faded in again.

[@way.lie.mp3]

This is insanely cool! Didn't know half of these existed

[@-pixelatedbrain-3494]

same

[@Darke_Exelbirth]

I actually do hear the pulsing effect of the 2000 and 2005Hz tones when they're separate, but it's a slower pulse than when they're played in sync in both ears.

[@mrarchaicworld]

And I don’t hear the pulsing of the lower tones when their in separate ears.

[@gaming4fun419]

@@mrarchaicworld You both should check if you really hear only one sound in each ear when he demonstrates that with 500 and 504Hz. Spatial or surround sound mix the channels for you, this only works in stereo.

[@getromire]

When I hear the barber pole illusion I can hear it going up and then down repeating the loop but it's very subtle.

[@bigmac463]

am i the only one that involuntarily smiles when two tones get closer to eachother

[@juliushamilton3656]

One of the best videos on KZbin. A world of discovery. I think someone needs to explore using these under-recognized aspects of sonic behavior for their aesthetic and musical possibilities.

[@boiboi2505]

Why do I get freaked out by majority of the sounds he plays

[@DkaraokeD]

There must be a certain like for what we consider "natural" or to be found in nature

[@xiaseth52900]

Right?! Like my fight or flight response kicked in when the circularity started.

[@LeatherCladVegan]

Because sound is the sense most closely associated with fear. If someone comes into your room at night, not making a sound, you can still hear them. You hear the sound that they absorb. Just like when you hold a piece of paper up to your face, you can hear it, even though it makes no sound. This is a big reason why sound is the sense of fear - it tells you when something is close, and otherwise undetected. I.e. a predator. There's also an obvious association with thunder, earthquakes and volcanos, but I'm not completely convinced they happen often enough to have shaped our instincts. In any case, this natural fear of sound can be abused to freak people out, and it is done all the time. Try watching a jump-scare without sound; it's just a changing image. The visuals don't frighten you because the visual change just means the monster is suddenly there. The jump-scare sound being loud, on the other hand, means that it is suddenly close. Again, *closeness* is the issue that we instinctively have a problem with. Hope that helps.

[@LeatherCladVegan]

@@DkaraokeD This is also true! Nothing in nature is perfect, but here, he can play you a whole bunch of perfect sine waves, for example. They don't sound natural, they sound horrible, in fact. That is another good reason that these sounds are unsettling. Good call :)

[@MaecaLarochelle]

I thought it was only me 😅

[@lrs0620]

I have always loved optical illusions. I never knew there were also audio illusions! Very cool!

[@DatBoi_TheGudBIAS]

Wait till u hear about audiovisual ilusiona

[@jayknight139]

It's almost as if our brains are in a constant state of illusion.

[@johnpowell6386]

This video looked like something different to me at first and almost clicked out of it but I heard a clear voice from someone who spoke well and to my surprise kept my interest. The subject material is out of my league but you made it interesting and I enjoyed it so I thank you sir! Good job and I plan on checking out more of your content on KZbin so keep it coming. Very talented!

[@Релёкс84]

I was expecting a clickbaity watchmojo top 10, but this video is really well made and educating!

[@AmblesJambles]

7:33 "hmm, human music"

[@CaseyConnor]

My man!

[@wirefrost5164]

2:35 "here's the 2000Hz tone" Oh no...Here we go

[@TheShadowWolf1]

Prepare your ears

[@LikaLaruku]

I have a sudden inexplicable craving for Meow Mix.

[@Kai_On_Paws_4298]

7:23 when my food is here but it gets set somewhere else but it's mine but i don't wanna get it so endless mindfuck

[@lukemccurdy3763]

I remember taking acid and watching a video with a cool pitch circularity effect and a constant zoom in to a infinite Mandelbrot set... watched that shit on repeat for like 4 hours

[@11darklight11]

Most of the looped sounds such as the one that goes down or slows down forever it is possible to pick up the beginning of each cycle and thus illusion breaks appart as you start to hear 2 cycles at the same time, with some displacement between each other

[@nyanSynxPHOENIX]

When you know what to look for and have been explained the trick, Haha. Even knowing it, it can still seem deceiving.

[@kevinmartin7760]

The circular rhythm one might benefit if the pitch was not also changing

[@CaseyConnor]

Yeah, I started trying to make a risset beat by hand via MIDI, etc, which would have had that nice property, but in the end I ran out of time and patience trying to figure it out and ended up using a script which also did the pitch shifting. Maybe some day. :-)

[@Cwighty13]

Just listen to Dun Dun Ba Ba by Jacob Collier for a real world example

[@MichaelCoombes776]

@@CaseyConnor Couldn't you make the MIDI parts at a constant tempo and then modify the tempo ruler in your DAW to create a linear change before rendering any audio? That way there's no pitch shifting, only note duration changes.

[@CaseyConnor]

Yes that's essentially how I started: a few MIDI parts using short-duration sounds only, a linear tempo ramp, and then you duplicate all the MIDI parts a couple times and half-time them and double-time them and lay them over the same tempo ramp, but you need to extend it for several more loops than that because at any given moment you're hearing ~8 versions of the same loop at different rates and levels: the 1/8th time version, the 1/4, the 1/2, the 1, the 2, the 4, and the 8, etc, all at once and fading in/out appropriately. I can't remember now what the problem was, but I ran into some tech issues making it work and ended up going the easier route (which is also cool because I could use a more sophisticated piece of audio.)

[@CaseyConnor]

And side note: it'd be really fun to get a group of people together to try to pull this off live. :-)

[@moritzrossbroich]

Wow. Didn't expect such quality tbh

[@etiennem.3191]

I am all aboard on this journey with you. This a big step into exploring the part of my world where sound is like the light.

[@dazoedave]

Thumbs up just for the awesome intro warning about loudness

[@floofzykitty5072]

Does anyone else find the combination tones very relaxing?

[@judef]

love the very subtle reverb on your voice over

[@Fairyfink]

As a autistic person with auditory sensitivities, this was a fascinating experience. I identified a number of illusions that cause me discomfort, and I found that strangely helpful. Knowledge is power?

[@levitheentity4000]

2:17 I can not hear the pulsing anymore I think ears are broken

[@talhaklc9621]

2:10 turn up the volume and take off your headphone, you can also try to slowly spread the left and right side of the headphones to hear the difference with blending and unblending of the sounds.

[@donepearce]

About three quarters of these worked for me. I'm a musician and was listening on really good headphones through a Focusrite interface, so there was no distortion happening before it reached my ears. For example I didn't hear the missing fundamentals - I perceived the notes as an octave higher when the fundamental was removed. Also the two tone test that was supposed to generate sum and difference tones - no. Didn't hear those. And finally the beats when the 500/504Hz tones were played in separate ears. No - no beats. I suppose we all have slightly different physiology and these things are to be expected.

[@gemmalouise3564]

I had the same experience. I am also a musician, so I wonder if that’s why

[@fredherfst8148]

Also a musician. After many years of trying to figure out why some folks can hear subtleties, others cannot, I am convinced that no two people “hear” exactly the same thing. Hell..as a bass player hearing a new song, I hear the chords and tonics first. Other people hear the lyrics first..etc.

[@BACzero]

I knew about binaural beats before I knew what they were called. Learned to use them to help tune my guitars as a teenager. :)

[@RandomJ2023]

This is exactly how a professional group of musicians can sound louder and more powerful than a larger group of less experienced. Powertones, overtones produced by performing perfectly in tune can quantify a group's ability. I remember listening to the Canadian Brass live, only 5 members but could fill an entire theater with no amplification easily.

[@salomahoney2675]

Also helps that they were playing brass 😂

[@roverclover3178]

Headphones recommended Hears the effects on my IPad Pro speakers: what kind of power do I hold?

[@deadrituals]

That first "beating" technique is so amazing on an electric guitar with a fuzz pedal to enhance that pulsating sustain, it's an effect we use on almost every song!

[@tayloryuill9593]

the infinitely ascending pitch and increasing tempo ones gave me such bad anxiety

[@sowyd._.3459]

Put on a shirt lmao

[@tedeisner822]

I think combination tones just explained to me a phenomenon I observed throughout life and watching some people sing. Some people seem to have the inclination to harmonize instead of sing along to the melody.

[@meetim2931]

13:00 Otoacoustic emissions are supposedly the basis behind a brand of headphones that began on Kickstarter called Nuraphone. I bought in & own a pair. The pitch (excuse the pun) is that they can set up your own personalised equaliser for the best possible listening experience based on your Otoacoustic emissions. However, I am firmly of the belief that it was an idea that sounded great in theory, but after taking everyone's money and looking into it, they realised it couldn't be done but decided to pretend they were doing it and push on. I don't deny they have an elaborate system for varying tonal quality, but I debate that 'your' setting is better than someone else's. They are just different and it depends what you are into at the moment as to whether you like it or not. The problem in evaluating it is that the results are entirely subjective. If you paid close attention to their updates & literature like I did, you realised that whatever Otoacoustic feedback they were getting (If any), there was no right answer as to what tonal control that should be mapped to, so effectively the entire output is arbitrary. I would add that the headphones are comfortable for about 5 minutes, after which the built in earbud thingys start to hurt my ears.

[@johnpaulboudreaux9569]

on that first one i was like "what? we're supposed to be hearing beating when they are split to different ears?" and then i realized that the acoustic illusion just didnt work on me

[@daviddo805]

Same

[@wesmatron]

Binaural beats are very handy when tuning a guitar: As you are tuning one string to another you can use the beats getting closer to tune the strings to be the same pitch

[@SteveJones172pilot]

Thats how I learned tuning too and the "beats" per minute is how many hz you're off..

[@wesmatron]

@@SteveJones172pilot 👍

[@lukasoliverleo3730]

I heard the beating of the 2000Hz-2005Hz even when they were panned. But the rythm of the beat was slower?

[@manand777]

I had the same experience too, as mentioned above..

[@erikziak1249]

Me too. On DIY pseudo-retro "vintage hifi" speakers. Speakers intentionally build out of old drivers, just for fun. However, with a properly designed crossover for a decent result.

[@Woowoo-m6x]

Beginning my masters degree in audio technology this Fall , thanks for this!

[@lilkornbread9791]

in the binaural beat one the beat goes away when the two tones are panned for me

[@name7692]

strange

[@SneakyCorndog]

Yeah, same here, except if I try and find the beating, it emerges.

[@Bubu567]

I can hear the beat if I concentrate, or I can make the beating go away.