Fig. 4
Robustness of the premicrosaccadic enhancement results at the individual neuron level. (a) In each panel, we plotted, for either brights (left) or darks (right), the peak visual response of neurons in baseline (x-axis) and with premicrosaccadic stimuli (y-axis; stimulus onsets within the interval from − 75 ms to − 25 ms relative to microsaccade onset). Each dot is an individual neuron in the 5% contrast condition. (b–e) At higher contrasts, premicrosaccadic enhancement was visually more robust, especially for the negative luminance polarity stimuli. (f–j) For each contrast level, we computed the ratio of the y- to x-axis values in (a–e) for each neuron and each luminance polarity. The upward pointing bar plots show the distributions of ratios for bright stimuli, and the downward pointing bar plots show the distributions of ratios for dark stimuli. In each distribution, the vertical red line indicates the mean across the population. Each p-value shows the Bonferroni-corrected result of a t-test comparing the dark to bright distribution at each contrast level. There was stronger premicrosaccadic enhancement for darks than brights at 20% contrast (see Fig. 3d). n = 166–193 neurons per panel and condition (Methods).
