FIG. 1.

Tracking task used to measure responses to stationary and moving targets. A: initial target positions for on-axis trials (black diamonds) relative to the receptive/movement field (gray patch). On any given trial, there was only one target. The line along which the targets were positioned varied depending on the receptive field (RF) of the neuron being recorded. B: initial target positions for off-axis trials. Same format as A. C: sequence of events for on-axis trials. Black squares represent fixation or saccade targets. Dashed circles represents desired eye position. Gray arrow represents target motion. Black arrow represents eye movements. D: sequence of events for off-axis trials. Same conventions as C.