Fig. 2.

Psychometric functions for motion curvature discrimination during pursuit and fixation for 2 representative subjects. The proportions of trials in which the curvature was reported as being “flatter” than the comparison motion curvature are plotted as a function of the comparison standard curvature with a radius of 7.93°. Psychometric functions are plotted in gray for fixation and in black for pursuit. A: a subject whose discrimination performance was better during fixation. B: a subject whose performance was better during pursuit.