Figure 3.

The effect of reward size on the initiation of pursuit for two-target stimuli across multiple experiments. Each trace plots average vertical eye velocity versus average horizontal eye velocity for each millisecond in the first 200 ms after the onset of target motion. Different colors show data for different reward-size paradigms. Traces in different quadrants show responses for different pairs of orthogonal directions of target motions. The multiple traces of the same color show results from identical experiments performed on different days. The two graphs show data for two monkeys. Open circles on the traces show the eye velocities 150 ms after the onset of target motion. In monkey P (panel B) we did not study the pursuit evoked by combinations of horizontal and upward target motion because pursuit was poor for the upward motion of single targets.