视觉剥夺猫外膝体神经元最优方位的分布特性

记录和测定了视觉剥夺猫（ｄａｒｋ－ｒｅａｒｅｄｃａｔｓ）外膝体３４４个细胞的方位调谐等感受野特性，多数细胞（８２％）具有方位敏感性（Ｂｉａｓ＞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。

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

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 criernactions. Also the adjacent cells tended to assume similar preferred orientations. These resuits 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.