Subject: Re: Perception as memory From: Eric LePage <ericlepage@xxxxxxxx> Date: Mon, 31 Aug 2009 23:12:20 +0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>In reply to your message dated 29/08/2009 at 16:18 Dear Diana, and list, Thanks for your personal comments. You noted: > Philip Vernon wrote an entertaining article about his shift of AP with > age in the British Journal of Psychology 1977, 68, 485-489. I found the article in my reprint collection, but inside I found a letter from Philip Vernon which accompanied the reprint, dated September 19, 1978. He would then have been aged 72. Rereading the article he specifically suggested how his experience is consistent with a change in stiffness of the basilar membrane. One of his comments to me echoes your own comments about variability: "My own hearing is, I would say, quite normal, apart from some natural tendency to deafness with age. But the deviance of my pitch norms is quite liable to fluctuate. E.g., at an ordinary orchestral or chamber concert, I may start off identifying the keys a semitone too high, and then notice half-an-hour later that everything is a tone too high; sometimes, of course, I am uncertain of which is predominant. But I don't seem to find any fluctuations with health, colds, or other conditions. (Signed: Philip E Vernon)" ----- So he seems to be suggesting that the same underlying parameter varies in the short-term as well as with age. Perhaps the same parameter explains the variation of AP with menses (Wynn, 1971) ? Andrew Bell (HR1992) also showed that spontaneous OAE frequencies also shift with menses, again suggesting a link with cochlear mechanical stiffness. Recently I showed a post-hoc analysis of CEOAEs suggesting a possible diurnal variation in the whole-waveform reproducibility (p<0.01) (Acoustics Australia April 2006). David Kemp did a prospective study (reported at the 2008 mechanics meeting in Keele) and concluded there was a diurnal variation in CEOAEs. Food for thought. Regards, ELeP www.oaericle.com.au