Cat area 17. III. Response properties and orientation anisotropies of corticotectal cells.
Cat area 17. III. Response properties and orientation anisotropies of corticotectal cells.
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猫区 17. 三．
DOI：
10.1152/jn.1986.56.4.1088
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发表时间：
1986
影响因子：
2.5
通讯作者：
Schwark,HD
中科院分区：
文献类型：
--
作者：
Weyand,TG;Malpeli,JG;Lee,C;Schwark,HD
在麻痹、麻醉的猫中，对17区皮质顶叶（CT）细胞的感受野特性进行了探讨。为了将这些与另一群小颗粒内细胞进行比较，我们还检查了第6层细胞的感受野特性。我们的CT细胞样本中有60%对增加的刺激长度（长度总和）表现出增加的反应，并被归类为标准复杂细胞。其余40%的细胞很少或没有长度总和，一般末端停止，被归类为特殊复杂细胞。标准和特殊复杂CT细胞具有互补的取向各向异性：标准复杂细胞的取向偏好分布偏向于斜向刺激，而特殊复杂细胞的取向偏好分布偏向于水平和垂直方向的刺激。在我们的样本中，细胞的感受野主要沿着水平子午线，所以我们不能确定这些各向异性是相对于垂直子午线还是相对于通过感受野的子午线来定义的。这些各向异性在首选方向的影响被CT细胞的宽方向调谐最小化。CT细胞的方向偏倚与报道的顶盖细胞的方向偏倚之间没有简单的关系。与皮质顶盖细胞的非均匀性不同，第6层细胞均匀地表现出强的长度总和、紧密的取向调谐和很少的自发活动。
The receptive field properties of antidromically identified corticotectal (CT) cells in area 17 were explored in the paralyzed, anesthetized cat. To compare these with another population of infragranular cells, we also examined the receptive field properties of cells in layer 6. Sixty percent of our sample of CT cells showed increased response to increased stimulus length (length summation) and were classified as standard complex cells. The other 40% showed little or no length summation, were generally end stopped, and were classified as special complex cells. Standard and special complex CT cells have complementary orientation anisotropies: the distribution of orientation preferences of standard complex cells is biased toward obliquely oriented stimuli, whereas special complex cells are biased toward horizontally and vertically oriented stimuli. The receptive fields of the cells in our sample were primarily along the horizontal meridian so we cannot determine if these anisotropies are defined relative to the vertical meridian or relative to the meridian passing through the receptive field. The effects of these anisotropies in preferred orientation are minimized by the broad orientation tuning of CT cells. There was no simple relationship between the direction bias of CT cells and the reported direction bias of tectal cells. In contrast to the heterogeneity of corticotectal cells, layer 6 cells uniformly showed strong length summation, tight orientation tuning, and little spontaneous activity.