Acoustic reflex anatomy (middle ear muscle reflex, stapedial reflex)

The acoustic reflex is a mechanism that protects the most sensitive parts of the ear from loud sounds.
Ear anatomy playlist:
• Ear anatomy
Mukerji S, Windsor AM, Lee DJ. Auditory brainstem circuits that mediate the middle ear muscle reflex. Trends Amplif. 2010 Sep;14(3):170-91. doi: 10.1177/1084713810381771. Epub 2010 Sep 23. PMID: 20870664; PMCID: PMC3624626.
www.ncbi.nlm.nih.gov/pmc/arti...
Music:
Twin Peaks by Gregory David
www.epidemicsound.com/track/U...

[@jrdoctorsnotebook]

I have my ENT surgery internship exams tomorrow morning. And you uploaded this now. Obviously it's gonna be a tough one. :) Thank you so much for the video!!

[@Nick41622]

Good luck. I hope you do well.

[@jrdoctorsnotebook]

@@Nick41622 Thank you very much. I saw your good wishes before I went to the hospital. Result: I barely passed! I passed thanks to Sam's videos.🧑‍⚕

[@Nick41622]

​@@jrdoctorsnotebook That's good. Sam has a good teaching technique.

[@HHg-dq6nh]

Hello can you help me what are you staying in surgery? Or where I can have a vedio about it

[@rawnatalib7243]

Your voice is so nostalgic. I used to watch you during my first year in medical school. I got recommended one of your lectures today and all the memories came back to me. Thank you for being our good teacher!

[@user-zu9bw5tc1v]

Interesting how the acoustic reflex triggers both sides of the head. Wondering if it could be used as a kind of therapy, there already seems to be a somatic component like with how music and binaural music seems to help people through anxiety. It might be possible to... have an audiologist make a reading of the tympan stiffness and create a custom song that can be used as a therapy to retrain the ear after trauma.

[@ooqui]

I have hyperacusis and my acoustic reflex basically both works way too good and not at all. One time is spasms and tries way too hard, the other time it doesn't work at all. This makes listening to everything difficult. I hear music, games and videos on maybe 20% to 10% (or less; generally 20 to 40 decibels less) of the volume other people tend to hear it. Stuff like cooking cannot be done without protective earwear like noise cancelling headphones. Human speech is way too loud, etc. It's both a nightmare and a blessing. For example, I cannot tune out unwanted sounds like others do. So if there's an ambulance siren, I hear it ALL, and it would make me deaf if I didn't cover my ears. This makes judging the actual loudness of sounds (e.g. in decibel) really easy for me, because for me every sound is always the exact same "correct" (relative to me) loudness. I can also hear/notice more in the frequency range that I do hear, because my brain and ears don't filter out 'unwanted' sounds; making me naturally good in sound design and e.g. human echolocation. But sound - sadly - generally just hurts if it's just a little too loud.

[@maryroberts9315]

The ability to "tune-out" extraneous noise is so amazing. I notice older people lose that ability, so everything is equally loud.

[@JohnSmith-pw7ri]

I had an ear infection in both ears recently and had the same issue, thankfully it went away.

[@azamatb557]

New hair looks sick

[@amitborade3949]

We like to watch your video please upload regularly

[@pimmelberger9967]

This is ONE BIG EAR.WOW❤😮

[@ronnronn55]

Audio amplifiers have AGC (Automatic Gain (volume) Control) which reduces volume level for louder sounds. Ronn

[@tkorte101]

Some might have that as a 'feature' but it is by no means the norm. What you're describing is s 'limiter' function. The converse is a 'compressor' function and it boosts the signal level for quieter passages. FM radio uses both to keep the sound level within a predictable range. Note that compression and limiting from an amplifier function are applied to the overall signal, not individual instruments or vocals. Specific frequencies can be limited by something called a de-esser, which usually targets sibilance frequencies, those used for the 'S' sound.

[@Battker]

If you're ever thinking you've run out of video ideas, I think you haven't done any yet on the rectus capitis and obliquus capitis muscles. (Or maybe you have and I couldn't find them). Anyways great vid as always

[@linjoy9627]

Any surgical damage to this area will cause Horner' syndrome

[@Nick41622]

Your voice sounds like Richard Hammond. I have Tinnitus in my left ear, it can be at times unbearable.👍