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ID 671
file
title alternative
The effects of the appearance rate of stimulus on the rats' auditory evoked potentials
creator
Sato, Nobuya
subject
auditory evoked potentials
Papez circuit
rats
stimulus appearance rate
neural model
NDC
Medical sciences
abstract
The mismatch negativity (MMN) is a component of the auditory event-related brain potential which is elicited by the infrequent stimuli within the repeated frequent stimuli. The stimulus sequence which generates the MMN has the property which elicit following two automatic processes: (1) the neural model for frequent stimulus is established, and difference between incoming stimulus and the model is detected (Cowan, Winkler, Teder, & Naatanen, 1993) and/or (2) the neural model for the context, infrequent as figure and frequent as ground, is established, and the attention to figure is called.

The Papez circuit is known to be critical for memory because the demage of these regions cause the memory deficit. In this study, auditory evoked potentials for frequent and infrequent tones in the above stimulus sequence were recorded from the regions of the Papez circuit (dentate gyrus, mammillary body, anterior thalamus) and cortices (auditory and entorhinal).

The purpose of this study is to examine following three : (1) whether the components which correspond to the automatic processes appear or not in the regions of the Papez circuit; and if these components appear, (2) the temporal relation between the information processing in the Papez circuit and that in cortical area by comparing the latencies of processing in the Papez circuit and that in cortical area by comparing the latencies of components; (3) the effects of stimulus appearance rate on those components in the Papez circuit.

In the regions of the Papez circuit, the amplitudes of the positive component peaking at about 30 and 70msec for infrequent tones were higher than those for frequent tones. But in the cortical area, only the amplitude of positive component peaking at about 70msec for infrequent tones was higher than those for frequent tones. These phenomenon disappeared as frequent and infrequent tones came to be more equal in the stimulus appearance rate. The results suggested that the information processing which based on the neural model of the frequent standard stimulus and/or on the context of global stimulus sequence occurred in the cortical area and the Papez circuit in parallel.
journal title
Memoirs of the Faculty of Integrated Arts and Sciences, Hiroshima University. IV, Science reports
volume
Volume 21
start page
207
end page
218
date of issued
1995-12-28
publisher
広島大学総合科学部
contributor
国立情報学研究所
date of created
2006-03-21
issn
1340-8364
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Integrated Arts and Sciences
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