Effects of visual cortical lesions on receptive-field properties of single units in superior colliculus of the rabbit.
Effects of visual cortical lesions on receptive-field properties of single units in superior colliculus of the rabbit.
复制标题
视觉皮层损伤对兔上丘单个单位感受野特性的影响。
DOI：
10.1152/jn.1982.47.2.272
复制
发表时间：
1982
影响因子：
2.5
通讯作者：
Murphy,EH
中科院分区：
文献类型：
--
作者：
Graham,J;Berman,N;Murphy,EH
1.在7只荷兰带兔的上级丘中研究了同侧视觉皮层消融后的179个单单位。这些单位的反应特性进行了比较，从20个完整的动物的上级丘记录的284个单一的单位。2.在灰层浅层和灰层中间的上部和下部，去皮质动物的方向选择性视觉单位的比例比正常动物小。3.在上层griseum浅，一个更大的比例的单位响应于频闪照明在去皮质动物比正常的。此外，在去皮质的动物，有一个较大比例的单位，其对一个小的移动刺激的反应被抑制的同时提出的频闪照明。4.在上层和下层的灰色表层，更大比例的视觉单位的反应良好，固定的刺激和较小比例的视觉单位表现出习惯性在去皮质动物相比，正常的。5.在浅灰色下层，单位的感受野更大，在前，后维度在去皮质动物比正常的延长。6.在这两种制剂中，单位在反应性或自发活动方面没有差异;视觉单位在其反应的持续性或短暂性、对亮或暗刺激的选择性、对刺激的起始或偏移的选择性或对刺激速度的选择性方面没有差异。7.本研究为家兔上级丘单位视觉感受野特性的研究提供了重要的视觉皮质-顶盖投射的证据。此外，这项研究表明，上级丘的细分差异的视觉皮质顶盖投射的损失的影响。
1. One hundred seventy-nine single units were studied in the superior colliculus of seven Dutch-belted rabbits following ablation of the ipsilateral visual cortex. The response characteristics of these units were compared with those of 284 single units recorded from the superior colliculus of 20 intact animals. 2. In both the upper and lower parts of the stratum griseum superficiale and in the stratum griseum intermediate, there were smaller proportions of direction-selective visual units in the decorticated animals than in normal ones. 3. In the upper stratum griseum superficiale, a larger proportion of units responded to stroboscopic illumination in the decorticated animals than in normal ones. Also, in the decorticated animals, there was a larger proportion of units whose responses to a small moving stimulus were inhibited by the simultaneous presentation of stroboscopic illumination. 4. In both the upper and lower parts of the stratum griseum superficiale, a larger proportion of visual units responded well to stationary stimuli and a smaller proportion of visual units showed habituation in decorticated animals compared to normal ones. 5. In the lower stratum griseum superficiale, the receptive fields of units were larger and were more elongated in the anterior-posterior dimension in the decorticated animals than in normal ones. 6. In the two preparations, units did not differ in responsiveness or spontaneous activity; and visual units did not differ in the sustained or transient nature of their responses, the selectivity for light or dark stimuli, the selectivity for onset or offset of the stimuli, or the selectivity for stimulus velocity. 7. This study provides evidence for the importance of the visual corticotectal projection in the elaboration of the visual receptive-field properties of units in the superior colliculus of the rabbit. In addition, this study shows that the subdivisions of the superior colliculus are differentially affected by the loss of the visual corticotectal projection.