COMPLEMENTARY GLOBAL-MAPS FOR ORIENTATION CODING IN UPPER AND LOWER LAYERS OF THE MONKEYS FOVEAL STRIATE CORTEX
COMPLEMENTARY GLOBAL-MAPS FOR ORIENTATION CODING IN UPPER AND LOWER LAYERS OF THE MONKEYS FOVEAL STRIATE CORTEX
复制标题
DOI：
10.1007/bf00248906
复制
发表时间：
1989-01-01
影响因子：
2
通讯作者：
DOW, BM
中科院分区：
文献类型：
--
作者：
BAUER, R;DOW, BM
从2只恒河猴纹状皮质中央核记录的269个细胞的群体中，研究了定向偏好性与感受野相对于凝视中心位置的函数关系。分离并比较颗粒上层和颗粒下层记录的细胞。在中央凹内(0.0-0.5度)，颗粒上细胞呈垂直偏向，而颗粒下层则不明显。偏心率较大时(0.5-2.5度)颗粒上细胞呈径向偏向(优先定向点朝向凝视中心)，而颗粒下细胞呈同心偏向(择优取向与凝视中心周围的圆相切)。这些结果与我们早先的报告一致，即颗粒上层和颗粒下层之间的取向转移(Bauer等人。1980、1983；Dow和Bauer 1984)。我们前面提到的对角方向偏差(Bauer等人)。1980；Dow和Bauer 1984)，偏心率在0.5到2.5度之间的颗粒上细胞。可以用径向偏向结合记录部位倾向于更接近斜线子午线而不是水平或垂直子午线的接受场位置来解释。鉴于其他证据表明，猕猴纹状皮质的上层细胞倾向于表现出方向或颜色的选择性，而下层细胞倾向于表现出运动敏感性(Dow 1974；Livingstone和Hubel 1984)，目前的数据表明，参与凝视眼球运动和图案视觉的颗粒上系统和颗粒下系统之间存在功能上的二分法，前者主要由行走过程中的光流场激活。
A population of 269 cells recorded from the foveal representation of striate cortex in 2 rhesus macaque monkeys was examined for orientation preference as a function of receptive field position relative to the center of gaze. Cells recorded in supragranular and infragranular layers were segregated and compared. Within the foveolar region (0.0-0.5 degrees) supragranular cells showed a vertical bias which was not evident in the infragranular layers. At larger eccentricities (0.5-2.5.degree.) supragranular cells showed a radial bias (preferred orientation points toward the center of gaze), whereas infragranular cells showed a concentric bias (preferred orientation is tangent to a circle around the center of gaze). These results are consistent with our earlier report of an orientation shift between the supragranular and infragranular layers (Bauer et al. 1980, 1983; Dow and Bauer 1984). The diagonal orientation bias which we noted earlier (Bauer et al. 1980; Dow and Bauer 1984) in supragranular cells at eccentricities between 0.5 and 2.5.degree. can be explained by the radial bias, combined with a tendency for recording sites to favor receptive field locations closer to the diagonal meridia than to either the horizontal or vertical meridia. Given other evidence that upper layer cells in macaque striate cortex tend to show either orientation or color selectivity, while lower layer cells tend to show movement sensitivity (Dow 1974; Livingstone and Hubel 1984), the present data suggest a functional dichotomy between a supragranular system involved in fixational eye movements and pattern vision and an infragranular system activated primarily by optical flow fields during ambulation.