FIG. 1.

Visual search task. A: monkeys made saccades to a target (here, an upright L; not to scale) presented with 1, 3, or 7 distractors. The monkey's eye position is represented by the dashed circle, which is invisible to the monkey. B: response time (RT, circles) and percentage error (squares) vs. set size for each monkey. Error bars represent SE around the mean of the session means. Filled symbols: monkey Q. Open symbols: monkey S. Error bars for percentage error are smaller than plotted points.