Window

window durations and time lags (Figure 1A), similar to results in human observers (Figure 2 in [3]). Different parameters for aftereffect length and noise yielded similar results (Supplemental Figure S1). Positive correlations arise because of an interaction between the short-term negative aftereffect and random fluctuations in the stimulus sequence. Any random sequence will exhibit fluctuations in the proportion of left or right stimuli. Because of the short-term aftereffect, responses are correlated negatively with the stimuli in recent history and thus show similar fluctuations in counterphase. Increasing the time lag of stimulus windows amounts to shifting the timecourse relative to observers ’ responses. Because of the fluctuations in both timecourses, some phase shifts will necessaril