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Re: painfully loud sound

I remember as a teenager I made a high powered ultrasonic source - as teenagers are wont to do!

At 50-60 kHz even my young ears couldn't hear it.

However as I brought the transducer closer to my ear it suddenly HURT VERY MUCH INDEED. No sound - just VERY intense pain. I can
still recollect it well many years on.

I wonder which part of the system created that pain?



----- Original Message -----
From: "James D. Miller" <jdmiller@ARTSCI.WUSTL.EDU>
Sent: Friday, November 12, 2004 6:29 PM
Subject: Re: painfully loud sound

> A man named Nober did and published such experiments with profoundly deaf
children. I don't have the reference handy, but you should be able to find it. i
think we're talking late 60's or early 70's before HSC (IRB) committees were
busy protecting their Institutions.

  James D. Miller
> Allan Goldstein wrote:<br>
> <blockquote cite="midF2C9D434-34BF-11D9-9315-00039342C954@yahoo.com"
>  type="cite"><!-- Times -->Dr Depireux’s reply to the location of
> acoustic pain is interesting. The experiment is simple to perform.
> Anesthesia of the tympanic membrane can be achieved by any
> otolaryngologist in about 30 seconds with an injection of local
> anesthetic along the posterior bony canal wall. Thus expose to
> painful sound level before and after. Experiment completed.
>   <br>
>   <br>
> Allan J. Goldstein M.D.
>   <br>
> Retired otolaryngologist.
>   <br>
> <a class="moz-txt-link-abbreviated"
>   <br>
>   <br>
> </blockquote>
> True: the only difficulty might be to convince the ethical review
> committee that there is no danger that the painfully loud sound might
> actually damage hair cells in the unfortunate subject. <br>
> >From the replies that I've had so far (thank you all for your
> insightful contributions by the way) it seems to be not uncommon
> for people who have some sensory-neural hearing loss to find some loud
> sounds painful even though they can't hear them. To my mind that
> supports Didier's and Yale's thoughts that nociceptors in the middle
> ear may be at least partly responsible, but more direct experimental
> proof
> would be nice. (Would anyone like to  volunteer as a subject ;-) ?)<br>
> <br>
> Jan<br>
> <br>
> <br>
> <pre class="moz-signature" cols="72">--
> --------------------------------------------------------
> Dr. Jan Schnupp
> University Laboratory of Physiology             St Peter's College
> Oxford University                               New Inn Hall Street
> Parks Road, Oxford OX1 3PT, UK                  Oxford OX1 2PL
> Tel (01865) 272513                              Tel (01865) 278889
> Fax (01865) 272469
> </pre>

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