Fig. 1.

In all experiments, dot fields alternate in motion direction between inward and outward, and in color between red and green. In Experiments 1 and 4, adjacent dot fields are one-half cycle out of phase as shown at top. Bottom, relative timing between the motion and color change (in → red interval) is varied to determine the best timing to produce the optimal pairing of color and motion. (For interpretation of the references to color in this figure, the reader is referred to the web version of this article.)