Figure 2. Intrinsic color modulation of pursuit to a single surface.

Each subject's data was normalized to the maximum pursuit produced to any color by that subject, to control for between subject variability. The error bars depict SEMs. Subjects exhibited different pursuit levels for different isoluminant colors. A one-way repeated measures analysis of variance showed a significant main effect of color on pursuit. (F _(3,12) = 4.83, p = 0.0198). This result indicates that colors modulate motion processing which drives the pursuit system.