SPATIOTEMPORAL REPRESENTATION OF SOUND INTENSITY IN THE GUINEA-PIG AUDITORY-CORTEX OBSERVED BY OPTICAL-RECORDING

被引：25
|
作者：
TANIGUCHI, I
NASU, M
机构：
[1] Department of Neurophysiology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo
来源：
NEUROSCIENCE LETTERS | 1993年 / 151卷 / 02期
关键词：
OPTICAL RECORDING; AUDITORY CORTEX; VOLTAGE-SENSITIVE DYE; SPATIOTEMPORAL REPRESENTATION; FUNCTIONAL ORGANIZATION; INTENSITY COORDINATE; ORTHOGONAL ORGANIZATION;
D O I：
10.1016/0304-3940(93)90015-D
中图分类号：
Q189 [神经科学];
学科分类号：
071006 ;
摘要：
The spatio-temporal representation of sound intensity in the guinea pig auditory cortex was studied by optical recording with the aid of a voltage-sensitive dye. Changes in light intensity due to neural activity induced by sounds at various pressure levels were recorded with a 12 x 12 array of photodiodes. The amplitudes of the responses were displayed as sequential two-dimensional images. The iso-intensity bands revealed by neural activity were orthogonal to the isofrequency bands of tonotopical organization in the anterior field and dorsocaudal field. The frequency-intensity representation through the orthogonal organization varied with time. This mechanism may be adapted to the auditory cortex to sequentially process the three parameters of sound: frequency, intensity, and time. Furthermore, a new field was found in the ventrocaudal region of the auditory cortex. This field showed tonotopicity, but high thresholds.
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页码：178 / 181
页数：4
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