Zhukov V A
Neirofiziologiia. 1980;12(1):75-85.
Arrangement of on- and off-discharge centres in the receptive fields of the 1st and 3d classes of the frog retina was determined by means of moving bars of different length. Three groups of fields are found. On- and off-centres of the 1st group receptive fields coincide, those of the 2nd group are divided spatially; in the 3d group fields the central position is occupied by the discharge centre of the same contrast sign, and in the periphery the discharge centres of the opposite sign are arranged to the right and to the left of the discharge centre. Thus the frog retina receptive fields possess features resembling concentric receptive fields of geniculate neurons and visual cortex field of the cat. The asymmetry in responses was found: with a bar moving in opposite directions the distance between discharge centres "changed"; with a bar moving in one direction only one of peripheral centres was revealed and with a bar moving in another direction--the second centre on the opposite side of the receptive field was detected. This asymmetry in space-time relations in the receptive fields is analogous to that which is found in the fields of the cortex neurons and is connected with their directional properties.
通过不同长度的移动光条，确定了青蛙视网膜第一类和第三类感受野中开中心和关中心的排列方式。发现了三组感受野。第一组感受野的开中心和关中心重合，第二组的开中心和关中心在空间上分开；在第三组感受野中，相同对比信号的放电中心占据中心位置，在周边，相反信号的放电中心排列在放电中心的右侧和左侧。因此，青蛙视网膜感受野具有类似于膝状神经元的同心感受野和猫的视觉皮层区的特征。发现了反应的不对称性：当光条向相反方向移动时，放电中心之间的距离“改变”；当光条仅向一个方向移动时，仅揭示一个周边中心，而当光条向另一个方向移动时，在感受野的另一侧检测到第二个中心。感受野中这种时空关系的不对称性类似于在皮层神经元的感受野中发现的不对称性，并与其方向特性有关。
