rarefaction onset? (Eckard Blumschein )

Subject: rarefaction onset?
From:    Eckard Blumschein  <Eckard.Blumschein(at)E-TECHNIK.UNI-MAGDEBURG.DE>
Date:    Sat, 15 Jul 2000 08:00:15 +0200

Dear Peter and list, I would much appreciate if you, after vacation, did not ignore my question marks concerning interval histograms, efferent equalization, effects of refractory time, high frequency = 10Hz, and spectral map. I would like to add just one more related moot point you might ponder about. Normally I expect most of the sound attacks and onsets to start with increasing sound pressure like plosives and condensation clicks. In case of vowel "a" I do not expect the opposite sign either. However the neurogram by Shamma rather resembles a sequence of rarefaction clicks. Possibly this lower than expected latency at low frequency is due to modification of the mechanisms within cochlea. Can you confirm that the stimulus was actually positive, i.e. condensation-like? When I checked my own experiments I was unhappy with non-ideal (oscillating) response of my loudspeaker to clicks. As far as I know, merely the Manger transducer is able to respond aperiodically. What type of loudspeaker did you use in your experiments? -- Eckard

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