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具有共同感受野的外膝体神经元的反应相位互补特性

李朝义, 徐杏珍

中国科学院上海生理研究所. 上海 200031

摘要

用微电极在猫外膝体进行记录时,有时同一支微电极能同时记录到两个神经元放电,通常是一个给光中心细胞和一个撤光中心细胞。这一对神经元具有共同的感受野,并且对光刺激的反应类型也相同(同属于瞬变型细胞,或者同属于持续型细胞)。当正弦调制的光点投射在它们的感受野中心时,在不同的刺激强度下,给光中心细胞和撤光中心细胞的反应相位彼此相差半个周期(180°)。在低的刺激频率(5Hz)下,给光中心和撤光中心细胞的反应峰值延迟时间(相对于光调制信号的最大和最小值)也相同,表明它们具有相同的反应潜伏期。

关键词： 猫; 感受野; 外膝体; 反应相位; 单神经元

Terporal phase complementarity ebtween the lateral gehiculate neurones sharing a common receptive field

Li Chaoyi, Xu Xingzhen

Shanghai Institute of Physioloyg, Chinese Academy of Sciences. Shanghai 200031, China

Abstract

Bi-unit recordings were sometimes obtained in the lateral geniculate nucleus of
cat with a single microelectrode. The neurone pairs consisted of an on-center and an off-center cell sharing a. common receptive field and both cells showed either transient or sustained responses to light stimulation. When a sinusoidally modulated light spot was presented at their receptive field center，the on-center and off-center cells responded half a cycle (=180°) out of phase with one another at all intensities tested.At a low temporal frequency (5Hz，peak responses occured in response to the maximum(in on-center cells) or minimum (in off-center cells) luminances of light modulation with an identical delay. The complementary phase property makes the cell couple work in a “push-pull”. manner and enables transient cells，which show half-cycle rectification as they work alone, to transmit modulated light signals of complete cycle.

Key words: Cat;Receptive field;lateral geniculate nucleus;Response phase;Single neurone

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引用本文：

李朝义, 徐杏珍. 具有共同感受野的外膝体神经元的反应相位互补特性[J]. 生理学报 1993; 45 (1): .

Li Chaoyi, Xu Xingzhen. Terporal phase complementarity ebtween the lateral gehiculate neurones sharing a common receptive field. Acta Physiol Sin 1993; 45 (1): (in Chinese with English abstract).