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.

引用

页码：178 / 181

页数：4

共 15 条

[1] RESPONSES OF NEURONS IN AUDITORY CORTEX OF MACAQUE MONKEY TO MONAURAL AND BINAURAL STIMULATION [J].