POSSIBLE FUNCTIONS OF THE INTERHEMISPHERIC CONNECTIONS BETWEEN VISUAL CORTICAL AREAS IN THE CAT
POSSIBLE FUNCTIONS OF THE INTERHEMISPHERIC CONNECTIONS BETWEEN VISUAL CORTICAL AREAS IN THE CAT
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DOI：
10.1113/jphysiol.1983.sp014627
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发表时间：
1983-01-01
影响因子：
5.5
通讯作者：
XIAO, Y
中科院分区：
文献类型：
--
作者：
BLAKEMORE, C;DIAO, Y;XIAO, Y
用两种技术研究了连接两侧大脑皮质17区和18区边界的纵裂轴突的功能。在另一个半球的相应部分进行广泛损伤之前和之后，在17/18边界区域记录了一个匹配良好的神经元样本。双眼驱动细胞的比例从96%下降到67%。方向和方向选择性，以及神经元群体的反应性，似乎没有改变。对于17区的细胞，双眼性的减少就不那么令人信服了，甚至非常接近胼胝体受体区。可逆冷却的17/18边界没有影响的少数细胞外的胼胝体区记录在另一个半球，也没有对18的35个细胞记录在胼胝体区。在10个细胞的感受野完全消失，在1只眼睛，在5个细胞有一个普遍的反应性降低，2个细胞失去了一部分的感受野，在同侧，在双眼。明显通过胼胝体传递的感受野位于视野的垂直子午线周围，并不局限于接收半球同侧的视觉半野：它们的分布与直接膝状皮层输入所提供的分布重叠。胼胝体17/18界投射的主要功能可能是促进皮层细胞的双眼会聚，并可能起部分立体视觉作用。
The functions of interhemispheric axons linking the borders between cortical areas 17 and 18 on the 2 sides of the brain were investigated by 2 techniques. A well-matched sample of neurons was recorded in the 17/18 border region before and after an extensive lesion was made in the corresponding part of the other hemisphere. The proportion of binocularly driven cells fell from 96 to 67%. Orientation- and direction-selectivity, as well as the responsiveness of the population of neurons, seemed unaltered. The reduction in binocularity was much less convincing for cells in the body of area 17, even very close to the callosal-recipient zone. Reversible cooling of the 17/18 border had no effect on the few cells recorded outside the callosal zone in the other hemisphere nor on 18 of the 35 cells recorded in the callosal zone. In 10 cells the receptive field disappeared completely in 1 eye; in 5 cells there was a general reduction in responsiveness; 2 cells lost a portion of the receptive field, on the ipsilateral side, in both eyes. The receptive fields that were apparently transmitted via the corpus callosum lay around the vertical meridian of the visual field and were not restricted to the visual hemifield ipsilateral to the receiving hemisphere: their distribution overlapped that provided by the direct geniculo-cortical input. The principal function of the callosal projection between the 17/18 borders may be to contribute to binocular convergence on cortical cells and perhaps to play a part stereoscopic vision.