Subject: Tr: Auditory delays (fwd)
From: Alexandra Hettergott (email@example.com)
Date: Mon Feb 15 1999 - 08:43:01 EST
From: firstname.lastname@example.org <email@example.com>
To: firstname.lastname@example.org <email@example.com>
Date: Tuesday, January 19, 1999 4:11 PM
Subject: Re: Auditory delays (fwd)
>---------- Forwarded message ----------
>Date: Tue, 19 Jan 1999 20:06:27 +0800
>From: Bill Budd <bill@PSY.UWA.EDU.AU>
>Subject: Re: Auditory delays
>While the neurophysiological basis of evoked auditory and magnetic fields
>are not well understood they are generally thought to reflect the net extra
>or intracellular currents, respectively, generated in the apical dendrites
>of pyramidal neurons in auditory cortex (ie. post-synaptic potentials).
>Hari, R. (1983). Auditory evoked magnetic fields of the human brain. Revue
>de Laryngologie Otologie Rhinologie, 104(2), 143-51
>Hari, R. (1991). On brain's magnetic responses to sensory stimuli. [Review]
>[33 refs]. Journal of Clinical Neurophysiology, 8(2), 157-69
>Mitzdorf, U. (1991). Physiological sources of evoked potentials.
>Electroencephalography and Clinical Neurophysiology (Suppl. 42), 47-57
>Naatanen, R. A. K. (1995). Generators of electrical and magnetic mismatch
>responses in humans. [Review] [63 refs]. Brain Topography, 7(4), 315-20
>Nunez, P. L. (1981). Electrical Fields of the Brain. New York: Oxford
>At 11:59 AM 1/19/99 +0200, you wrote:
>>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
>>McGill is running a new version of LISTSERV (1.8d on Windows NT).
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>Cognitive Neuroscience Laboratory, Dept of Psychology
>University of Western Australia, Nedlands W.A. 6907
>Ph: +61 8 9380 1413 or +61 8 9347 6424
>FAX: +61 8 9380 1006
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