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Fig. 5. Stratification procedure. (A) (Upper) Two complementary stimuli of the onset condition. Dotted circle represents fixation at fixation point 1 (FP1). (Lower) Distribution of eye positions (0.2° x 0.2° bins) while the monkeys fixated FP1 (cross). (Left) Eye positions in trials with stimulus 1 (n = 193). (Center) Eye positions with stimulus 2 (n = 187). (Right) The stratified distribution of eye positions (n = 172) was obtained by removing excess trials in every bin. (B) Same as above but for the saccade condition, while the monkey fixates on FP2.

Fig. 6. Computation of t0 in the saccade condition. (A) Red dots show the eye movement trace (one sample per 1.8 ms). Red cross depicts the eye position when the receptive field (red rectangle) touches the curve. This point in time is taken as t0. Blue cross depicts the eye position at the end of the saccade. (B) Latency of visual responses in the onset (Left) and saccade (Right) condition. The green curve was fitted to the average response (black curve) to determine the visual latency.

Fig. 7. Suppression of spontaneous activity in the saccade condition. (Left) Population response aligned on stimulus onset. (Right) Population response aligned on the moment that the receptive field comes in contact with one of the curves.

Fig. 8. Attentional modulation of neuronal responses in a cueing task. (A) After initial fixation (300 ms), the stimulus was presented for 200 ms (cueing period) and then disappeared. It reappeared after 500 ms, and the monkey had to maintain fixation for an additional 200 ms. Then the animal made a saccade to the circle at the end of the target curve (blue arrow). (B) Complementary stimuli. The rectangle depicts a multiunit receptive field located on a segment of the target (Upper) or distractor (Lower) curve. (C) Population response (n = 33) in the cueing period (Left) and at stimulus reappearance (Right). In the cueing period, enhancement of responses to the target curve occurs at a latency of 133 ms. When the stimulus is displayed for the second time, modulation appears at a latency of 104 ms.