ELECTROPHYSIOLOGICAL STUDIES ON THE NUCLEUS ISTHMI OF THE LIZARDS Gekko gekko AND Shinisaurus crocodilurus

This report studies visual responses of the isthmic units in Gekko gekko and Shinisaurus crocodilurus using extracellular recording and cobalt sulfide marking techniques. Our results indicate that: (ⅰ) the nucleus isthmi pars magnocellularis (Imc) is a visual center; (ⅱ) there are luxotonic units in Imc; (ⅲ) Imc units respond vigorously to moving contrast targets, of which 35% units burst only at the moment when targets are moving into and out of their receptive fields, none react to either tactile or auditory stimulation; (ⅳ) there exist binocular units in Imc; and (ⅴ) visual field is topographically projected onto Imc.     

蛤蚧和鳄蜥峡核的电生理研究

本文用细胞外记录和硫化钴标记技术研究了蛤蚧(Gekko gekko)和鳄蜥(Shini-saurus crocodilurus)峡核单位的感觉反应.结果指出:(1)峡核大细胞都(Imc)是视觉中枢;(2)Imc内存在照度反应(luxotonic)单位;(3)Imc单位对运动的反差目标反应活泼,35％单位只在目标进出其感受域瞬间发放脉冲 ;(4)Imc内有双眼单位 ;(5)视野在Imc上呈区域对应投射。