Fig. 6. The time course and latencies of the responses of 10 V1 neurones to step ocellar stimuli. (A) Instantaneous firing rates from 10 neurones arranged according to the latency of peak activity, t_peak. Data were averaged over more than 100 trials for each animal, the scale bar shows 100 spikes s^-1. Blue broken lines indicate the spontaneous firing rate. (B) Stimulus sequence presented in each trial; LED intensity difference=(left LED output-right LED output); I_max, max LED output. (C) The latency of peak activity plotted against spontaneous firing rate. Red dots: latency versus spontaneous rate for the 10 neurones shown in A; blue crosses: the reduced peak latencies recorded when five of these cells were driven at >250 spikes s^-1 by stimulating the compound eye. The vertical bars indicate a significant reduction of latency in each cell.