Figure 4.

Activity of an example SEF neuron conditioned on saccade direction, around the times of the rule-selecting saccade (left), the refixation saccade (center), and the rule-implementing saccade (right). Spike density functions used Gaussian kernels of σ = 20 ms (MacPherson and Aldridge, 1979). The neuron exhibited perisaccadic modulations for all three saccades, but the modulations were directionally sensitive only for rule-selecting and refixation saccades. Shaded error bars are SEM across trials within each condition.