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Aniruddh Patel wrote:
> Dear Auditory list,
> Does anyone happen to know a reference which reports the delay between
> the arrival of sound at the ear and the arrival of stimulus-related
> activity (esp. synaptic potentials) in primary auditory cortex? Does
> this delay depend on the amplitude of the stimulus? I'm particularly
> interested in data from humans.
> Ani Patel
> Aniruddh D. Patel
> The Neurosciences Institute
> 10640 John Jay Hopkins Dr.
> San Diego, CA 92121
> 619-626-2085 tel
> 619-626-2099 fax
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Dear Ani Patel,
the delay between to onset of the stimulus and the evoked potentials /
fields at the human primary auditory cortex has been found to be of
about 30 ms (so called "middle latency components" of EEG and MEG).
For more detailled information I would recommend to read:
Pantev et al. (1995): "Specific tonotopic organizations of different
areas of the human auditory cortex revealed by simultaneous magnetic and
electric recordings". Electroencephalography and clinical
Neurophysiology 94, 26-40.
There is evidence that the latency is shortened with increasing
loudness up to about 60 dB nHL.
Furthermore, there is evidence of an amplitopic organization of the
secondary auditory cortex (latency: about 100 ms), i.e. the locus of
maximal excitation seems to depend on intensity as well (Pantev et al.
(1986): "Causes of differences in the input-output characteristics of
simultaneously recorded auditory evoked magnetic fields and potentials",
Audiology, 25, 263-276).
Annemarie Seither-Preisler, Ph.D.
Dept. of Experimental Audiology
Westfalian University Muenster
D-48129 Muenster, Germany
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