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猫纹状皮层神经元整合野的形状和范围

李武, 李朝义

中科院上海生理研究所感觉雠息处理研究室. 上海 200031

摘要

用正弦调制的移动光栅测量了120个猫纹状皮层神经元在长度和密度方向上的空间整合特性 。结果表明:(1)大多数细胞的传统感受野具有长度相近的结构, 然而它们的整合野多数是宽而短或者窄而长的长条形。(2)整合野大小为传统感受野的2-7倍, 平均为3.7倍。简单细 胞与复杂细胞整合野的大小没有显著差别。(3)随着感受野的视网膜偏心度的增加, 整合野 大小有逐渐增大的趋势。(4)感受野靠近视网膜垂直中线的细胞, 其整合野可以跨越中线进 入同侧视野; 在两半视野中整合野的范围没有显著差异, 但是同侧视野整合野的作用强度明显弱于对侧视野。以上结果显示, 初级视皮层神经元能够对大范围内的图形特征进行整合, 这种整合作用来自两侧视野。图5参20

关键词： 猫; 视皮层; 神经元; 感受野; 空间总合; 整合

Shape and extent of integration field of cat^s striate cortical neurones

Li Wu, Li Chaoyi

Shanghai Institute of Physiology, Chinese Academy of Sciences. Shanghai 200031

Abstract

120 cells were recorded from area 17 of cats and their length and width summation properties were investigated by drifting sinusoidal grating patches. The study shows that (1) for most of the cells, the RF was roughly equal in length and width, while most of the integration fields (IFs) were of elongated sape either in length or in width; (2) the size of the IFs was mostly 2---7 times (mean 3.7 times) the size of the related RFs, no significant difference was seen between the simple and the complex cells; (3) the size of the IFs tends to increase with increase of retinal eccentricity of the RFs; (4) for neurones whose RF located near the vertical meridian (VM), the IF extent, bilaterally into both the contra--and the ipsilateral sides to about the same extend, but the strength of the modulatory effect of the ipsilateral field is weaker than that of the contralateral field. The above results indicate that neurones of the primary visual cortex integrate visual information from an extensive visual field, and the integration effect may cross the VM to the ipsilateral side.

Key words: Cat;Visual cortex;Neurone;Receptive field;Spatial summation;Integration

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引用本文：

李武, 李朝义. 猫纹状皮层神经元整合野的形状和范围[J]. 生理学报 1995; 47 (2): .

Li Wu, Li Chaoyi. Shape and extent of integration field of cat^s striate cortical neurones. Acta Physiol Sin 1995; 47 (2): (in Chinese with English abstract).