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视觉系统皮层下细胞的方位和方向敏感性

寿天德, 周逸峰

〔中国科学技术大学生物系视觉研究实验室，合肥230027)

摘要

视觉方位、方向选择性曾被认为是高等哺乳动物视皮层细胞的特有功能。近年来大量的实验结果表明，视皮层下的外膝体神经元和视网膜神经节细胞都具一定程度的方位和方向敏感性，这些性质是遗传决定的，不受后天环境的影响。在外膝体内，已为视皮层细胞高度的方位、方向选择性和功能柱的形成做出了初步的分类与编组，提供了前级安排。这种皮层下的方位、方向敏感性细胞在发育过程中传递和加工了环境视觉信息，促进了视皮层更强的方位、方向选择性机制和方位功能柱的形成。外膝体在视觉信息平行处理通道的形成上起着分类集聚的重要作用。

关键词： 方位敏感性; 方向敏感性; 视觉皮层下细胞; 感受野; 猫

ORIENTATION AND DIRECTION SENSITIVITY OF CELLS IN SUBCORTICAL STRUCTURES OF THE VISUAL SYSTEM

SHOD TIAN-DE, ZHOU YI-FENG

Vision Research Laboratory, Department of Biology, University of Science and Technology of China, Hefei 230027)

Abstract

Since the work of Hubel and Wiesel，it is generally accepted that visual orient tion 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 detectablity.

Key words: orientation sensitivity;direction sensitivity;cat visual subcortical cells;receptive field ;

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引用本文：

寿天德, 周逸峰. 视觉系统皮层下细胞的方位和方向敏感性[J]. 生理学报 1996; 48 (2): .

SHOD TIAN-DE, ZHOU YI-FENG. ORIENTATION AND DIRECTION SENSITIVITY OF CELLS IN SUBCORTICAL STRUCTURES OF THE VISUAL SYSTEM . Acta Physiol Sin 1996; 48 (2): (in Chinese with English abstract).