Figure 7.

Choices reflect recent stimulus history. (A) To assess the influence of different stimulus epochs (frames) on each subject’s choices, we estimated their temporal integration weights (temporal kernel) using psychophysical reverse correlation. For each trial, k, we computed the difference between the mean motion direction over all dots, , for each stimulus frame, j, and the target motion direction, . For each frame, j = 1, …, N, we constructed a vector containing these differences for all trials. We then computed the correlation between this vector, for each frame, with the vector containing the difference between the subject’s choices, , and the corresponding target motion directions, , to reveal the subject’s “temporal kernel”. (B) Temporal kernels for each subject for trials aligned with the onset of the motion stimulus. (C) Temporal kernels for each subject as in B, after realigning each trial with the onset of the saccade indicating the subject’s choice. Arrow heads indicate the estimated saccade dead time for each subject. For comparison, B and C also show temporal kernels for four human observers performing the same motion estimation task. Shaded regions indicate bootstrap estimates of 95% CIs. (D) Average saccade-aligned temporal kernels for marmosets and humans, accounting for differences in saccade dead time and normalizing to the peak amplitude.