Shou T D, Zhou Y F
Department of Biology, University of Science and Technology of China, Hefei.
Sheng Li Xue Bao. 1996 Apr;48(2):105-12.
Since the work of Hubel and Wiesel, it is generally accepted that visual orientation and direction selectivity are achieved by processes in the visual cortex in the higher mammals. This view seems to require revision in views of more recent experimental finding that both relay cells in the lateral geniculate nucleus (LUN) and the ganglion cells in the retina do show some orientation and direction sensitivities. Such selective sensitivities in the LGN which are genetically determined and not affected by post-nated environment, would furnish a basis for further architectural fabrication in the visual cortex for orientation/direction detection. Relativiely segregated grouping in the LGN plays an important role in the formation of parallel processing pathways of the visual system. In the course of post-natal development of the visual system, the emergence of orientation/direction sensitive cells in the subcortical level would contribute to enhance intracortical mechanisms to achieve more refined orientation/direction detectability.
自休伯尔和威塞尔的研究工作以来，人们普遍认为，高等哺乳动物的视觉皮层中的过程实现了视觉方向和方向选择性。鉴于最近的实验发现外侧膝状核（LGN）中的中继细胞和视网膜中的神经节细胞确实表现出一些方向和方向敏感性，这种观点似乎需要修正。LGN中这种由基因决定且不受出生后环境影响的选择性敏感性，将为视觉皮层中进一步的结构构建以进行方向/方向检测提供基础。LGN中相对分离的分组在视觉系统平行处理通路的形成中起重要作用。在视觉系统出生后的发育过程中，皮层下水平方向/方向敏感细胞的出现将有助于增强皮层内机制，以实现更精细的方向/方向可检测性。
