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视觉剥夺猫外膝体神经元最优方位的分布特性

周逸峰, 寿天德

(中国科学技术大学生物系视觉研究实验室，合肥230026；中国科技大学北京认知科学开放实验室，北京100039)

摘要

记录和测定了视觉剥夺猫(dark-reared cats)外膝体344个细胞的方位调谐等感受野特性，多 数细胞(8200)具有方位敏感性( Biases 0. 1)。最优方位的分布与正常猫类似，偏向于水平方位，但分布特性强于正常猫。与正常猫类似，视觉剥夺猫外膝体细胞的最优方位与该细胞感受野在视网膜上的位置有关，偏向平行于视网膜中心区与感受野中心的连线(向心线);外膝体内位置相邻近的细胞具有相近的最优方位，亦呈现初步有序排列。结果表明:外膝体细胞最优方位的分布特性与后天视觉经验无关而可能来源于遗传因素。

关键词： 方位敏感性; 有序排列; 外侧膝状体; 视觉剥夺猫

TOPOGRAPHIC RELATIONSHIP OF ORIENTATION SENSITIVE RELAY CELLS IN LATERAL GENICULATE NUCLEUS (LGN) OF DARK-REARED CATS

ZHOU YI-FENG , SHOD T1AN-DE

(Vision Research Laboratory, Department of Biology, University of Science and Techno1ogy of China, Hefei 230026；Beijing Laboratory of Cognitive Science, University of Science and Technology of Mua, Beijing 100039)

Abstract

The orientation sensitivity of the LGNd neurons of dark-reared cats were investigated. As in normal cats，most of the cells studied were significantly sensitive to the orientations of grating stimuli (Bias> 0. 1)，and preferred horizontal and/or radial orientations. Also the adjacent cells tended to assume similar preferred orientations. l'hes,_rcsults indicate that visual deprivation in cats neither affect the distribution properties of
preferred orientations，nor the clustering of cells with similar preferred orientations in the LGN.

Key words: orientation sensitivity;organized arrangement;lateral geniculate nucleus;dark-reared cats

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引用本文：

周逸峰, 寿天德. 视觉剥夺猫外膝体神经元最优方位的分布特性[J]. 生理学报 1996; 48 (2): .

ZHOU YI-FENG , SHOD T1AN-DE. TOPOGRAPHIC RELATIONSHIP OF ORIENTATION SENSITIVE RELAY CELLS IN LATERAL GENICULATE NUCLEUS (LGN) OF DARK-REARED CATS. Acta Physiol Sin 1996; 48 (2): (in Chinese with English abstract).