Subject: Re: painfully loud sound From: "Richard H." <auditory(at)AUGMENTICS.COM> Date: Fri, 12 Nov 2004 19:07:18 -0000I 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? regards, Richard ----- Original Message ----- From: "James D. Miller" <jdmiller(at)ARTSCI.WUSTL.EDU> To: <AUDITORY(at)LISTS.MCGILL.CA> 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(at)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" href="mailto:Bostonear-auditory(at)yahoo.com">Bostonear-auditory(at)yahoo.com</a> > <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> > > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.784 / Virus Database: 530 - Release Date: 27/10/2004