Fig. 1.

Memory-guided gap saccade task with luminance noise. After the initial fixation period, the fixation cross disappeared. After fixation offset, a fixed gap period began, followed by target presentation (outlined in white for clarity). The target was either in the receptive field of the recorded SC neuron or in the mirrored location in the opposite hemifield. Monkeys then made a saccade to the remembered target location. Target color and location were selected randomly interleaved on each trial. Locations were 45° above, 45° below, or on the horizontal meridian. Targets were 4° eccentricity in monkey FS and 6° eccentricity in monkey CA. ITI, intertrial interval.