[Intracellular on--off responses of carp retina amacrine cells adapted to the dark].

Dependence of the amplitude and latency of on and off responses of amacrine cells in the isolated dark-adapted carp retina upon the light spot intensity and diameter was studied by intracellular recordings. It is shown that the responses of amacrine cells to onset and offset of light consist of trasient depolarizations with oscillatory potentials and impulses. The latency of the on response decreases and the latency of the off response increases when the light spot intensity and diameter are increased. A dependence close to linearity on logarithm of the spot diameter up to 3 mm is observed for the on response amplitude with changes in intensity within 4 log. units. The amplitude and zone of summation of the off response decrease, when intensity of the stimulus is increased. It is supposed to result from differences in the amplitude and time characteristics to offset of light in the bipolars which give inputs to amacrine.