Anisotropy in the representation of direction preferences in cat area 18
Anisotropy in the representation of direction preferences in cat area 18
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DOI：
10.1111/j.1460-9568.2008.06219.x
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发表时间：
2008-05-01
影响因子：
3.4
通讯作者：
Ajima, Ayako
中科院分区：
文献类型：
--
作者：
Ribot, Jerome;Tanaka, Shigeru;Ajima, Ayako
较高的视觉皮层区域涉及复杂刺激的感知，例如由自我运动产生的光流。另一方面，区域 18 被认为可以提取原始视觉特征，为更高的皮质区域提供进一步处理。在这项研究中，我们应用了猫区域 18 中央下视野中固有信号的光学成像，并重建了每个半球的方向偏好和方向选择性图。根据之前的电生理学结果，我们观察到向下和时间方向的显着过度表达。然而，基本取向并没有被过度代表。向下方向在最高方向选择性域中被过度代表。另一方面，时间方向表示随着方向选择性而降低。因此，我们的研究结果表明猫的 18 区存在处理光流的神经基质。
Higher visual cortical areas are involved in the perception of complex stimuli, such as the optic flow created by self-motion. On the other hand, area 18 is thought to extract primitive visual features, feeding higher cortical areas for further processing. In this study, we applied optical imaging of intrinsic signals in the central, lower visual field of cat area 18, and reconstructed direction preference and direction selectivity maps in each hemisphere. We observed a significant overrepresentation of downward and temporal directions, in accordance with previous electrophysiological results. Cardinal orientations were not overrepresented, however. Downward directions were overrepresented at the highest direction selectivity domains. Temporal direction representation, on the other hand, decreased with direction selectivity. Our findings therefore suggest the existence of a neural substrate for the processing of optic flow in cat area 18.