Fig. 3.

Presaccadic changes in FF for “mean-matched” conditions. The mean-matching algorithm was applied to presaccadic spike trains from the population of recorded V4 neurons to equalize firing rate distributions across time for each of the saccade directions. A: mean-matched firing rates for each of the saccade directions (toward, left; up, middle; opposite, right), which no longer vary over time. B: FF of the mean-matched data, which still declines presaccadically despite removing variation in firing rate. C: the magnitude of FF decline in the final 80-ms period before the saccade for each of the 3 saccade directions. The FF decline plotted corresponds to the component of the FF decline independent of the presaccadic change in mean firing rate, computed in an ANCOVA. Error bars represent 95% confidence intervals from ANCOVA.