Figure 2.

Example data showing the effect of reward size on the initiation of pursuit. The sequence of snapshots illustrates the structure of the behavioral task with two targets (top) or single targets (bottom). We show targets as filled and open spots for clarity of presentation, although they actually were green and yellow in our experiments. A, Examples of the horizontal (Horiz.) and vertical (Vert.) eye velocity in two different trials. The continuous and dashed traces show responses when the highly rewarded target moved horizontally or vertically. B, The black solid and dashed traces show examples of the horizontal eye position (Pos.) and velocity (Vel.) in trials that led to large or small rewards. The gray dashed lines are the target position and velocity.