FIGURE 1.

Representative visual and movement neurons recorded in the frontal eye field of a macaque monkey performing visual search for a target that was easy (red) or hard (green) to distinguish from distractors. The activity when the target (solid) or distractor (dashed) fell in the receptive field or movement field is compared. Note the delay in the time when the visual neuron distinguishes the target from the distractor in hard as compared to easy search. Note the corresponding delay in the time when the movement neuron activity begins to accumulate to a threshold.