Re: cochlear wave travel time (Daniel Adam Taft )


Subject: Re: cochlear wave travel time
From:    Daniel Adam Taft  <dtaft@xxxxxxxx>
Date:    Thu, 24 Jul 2008 20:34:52 -0400
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You could also just stimulate with a tone and time the neural delay. Luckily this has been done already. Two such examples are: Anderson, Rose et al (1971) measured oval window to auditory nerve delays in squirrel monkeys for tones at loud levels (>90 dB SPL). See figure 3. They give: Delay(ms) = 1.95*frequency(kHz)^(-0.725) Donaldson and Ruth measured latencies for 65 dB SPL tones in humans using EEG. See figure 4. They give: Delay(ms) = 4.915 + 0.363exp(0.11324*d(mm from stapes)) Or carefully using Greenwood's formula to convert d to f (if I haven't messed this up) gives: Delay(ms) = 4.915 + 1230/F(Hz)^0.82 If you are estimating relative delays then you can probably ignore the leading 4.915 constant here, it is the asymptote independent of frequency. Hope that helps, Daniel. P.S. Here are the BibTex citations. @xxxxxxxx{ Author = {Anderson, D. J. and Rose, J. E. and Hind, J. E. and Brugge, J. F.}, Title = {Temporal Position of Discharges in Single Auditory Nerve Fibers within Cycle of a Sine-Wave Stimulus - Frequency and Intensity Effects}, Journal = {The Journal of the Acoustical Society of America}, Volume = {49}, Number = {4}, Pages = {1131-1139}, Year = {1971} } @xxxxxxxx{ Author = {Donaldson, G. S. and Ruth, R. A.}, Title = {Derived Band Auditory Brain-Stem Response Estimates of Traveling-Wave Velocity in Humans .1. Normal-Hearing Subjects}, Journal = {The Journal of the Acoustical Society of America}, Volume = {93}, Number = {2}, Pages = {940-951}, Year = {1993} }


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