[The effect of stimulus velocity on inhibition efficiency in the responses of the retinal ganglion cells in the frog].

Responses of 3 class ganglion cells evoked by dark bars of different vertical size moving with different velocity were studied in Frog's retina. The data obtained shows that effect of inhibition diminished with increasing of the velocity over 40 degrees/sec. The on- and off-inhibitory zones of receptive fields seem to have different spatial-temporal properties. An on-inhibitory zone has homogeneous structure and is not far from the central zone of receptive field. An off-inhibitory zone consisted of near and distant subzones. The effect of a near subzone hardly depended on the velocity of moving visual stimuli. The effect of a distant off-inhibitory subzone weakly depended on the velocity of moving stimuli and spread to 20 degrees from the central excitatory zone.