Fig. 3.

Effects of picrotoxin on the oscillation-like activities of the ON and OFF responses. A In control, the oscillatory frequency was 40 and 27 Hz for the ON and OFF responses, respectively. B The oscillation-like activity patterns of both ON and OFF responses were eliminated by picrotoxin (100 μM). C, D Scatter and bar plots for the mean firing rate during control and picrotoxin. E Oscillatory frequency. F Oscillation index (N = 18 neurons from 7 retinas, bar plot: mean ± s.e.m., *p < 0.05; **p < 0.01; t test)