Fig. 2.

Choice performance. (a–c) Probabilities of making a saccade to the rightward target as a function of the right-target color percentage for no-stop (black) and noncanceled stop (gray) trials for (a) macaque B, (b) macaque X, and (c) humans. The mean (open circles) and SD (bars) across monkey sessions and human subjects were fit with Weibull functions. (d–f) RTs as a function of right-target color percentage. The means and SDs across monkey sessions and human subjects are shown for correct choices during no-stop (black circles and lines) and noncanceled stop (gray circles and lines) trials, and diamonds are incorrect choices. Note that the y-axes for the monkeys differ from that for humans in panels d–f