鸟类离顶盖通路的结构和电生理特性

离顶盖通路是鸟类主要的视觉通路之一, 由视网膜、视顶盖、圆核和外纹体组成. 各结构之间具有区域性的对应投射;通路中的神经细胞具有不同的感受野特性, 对不同形式的刺激呈现出不同的反应模式. 参与物体运动方向和物体的朝向分析、运动物体的速度检测、颜色和物体轮廓处理、图象-背景识别、视觉指导定位、捕食和逃避反应等.离顶盖通路侧重于加工关于目标运动的特殊视觉信号,而对自身引起的视觉运动不敏感.

Structcture and Characteristics of Electrophysiology in the Tectofugal Pathway of Birds

The tectofugal pathway is one of mainly visual pathways,it is composed of retine,tecta,necleus rotundus and ectostriatum.Among these structures exist topographic projections.Neurons,in the pathways,have different characteristics of receptive fields and reponse models to different stimulation.These structures may be more concerned with the analysis of directionality,orientation and velocity of moving objects,and the processing of colors,contours,figure/grpimd segregation,visually guided orientation,prey-catching and avoidance responses etc.The tectofugal pathway seems remarkably well-adapted to process specific visual information about object motion while ignoring most classes of self-induced visual motion.