Yin T C, Greenwood M
Department of Neurophysiology, University of Wisconsin, Madison 53706.
Exp Brain Res. 1992;88(1):1-14. doi: 10.1007/BF02259124.
The visual response properties of cells in the middle (MS) and lateral (LS) suprasylvian cortices were studied in alert cats, which were trained to fixate a spot of light and maintain fixation when a second test light was introduced in the midst of fixation. This second light served to test for visual sensitivity, and it could be moved at different speeds in any direction under computer control. Over half of the cells exhibited a visual response. With a small spot of light, most cells were directionally selective and responded better to a moving spot than to a stationary one. In some cases movements of the spot in the non-preferred direction revealed an inhibitory process. The visual receptive fields were large and often extended into the ipsilateral hemifield, though the centers of the receptive fields were usually in the contralateral field. We used Fourier analysis to quantify directional selectivity and compared these results to other commonly used measures of directional selectivity. Compared to cells in MS, there was a higher incidence of visual cells in LS and the visual cells were more directional. We also made comparisons between our results and those found in anesthetized cats and awake monkeys.
在警觉的猫身上研究了中（MS）和外侧（LS）上薛氏皮质细胞的视觉反应特性。这些猫经过训练，能够注视一个光点，并在注视过程中引入第二个测试光时保持注视。这个第二个光用于测试视觉敏感性，并且可以在计算机控制下以不同速度向任何方向移动。超过一半的细胞表现出视觉反应。对于一个小光点，大多数细胞具有方向选择性，对移动的光点反应比对静止的光点更好。在某些情况下，光点在非偏好方向的移动显示出抑制过程。视觉感受野很大，并且常常延伸到同侧半视野，尽管感受野的中心通常在对侧视野。我们使用傅里叶分析来量化方向选择性，并将这些结果与其他常用的方向选择性测量方法进行比较。与MS中的细胞相比，LS中的视觉细胞发生率更高，并且视觉细胞的方向性更强。我们还将我们的结果与在麻醉猫和清醒猴子身上发现的结果进行了比较。
