Figure 9.

Relationship between preparatory activity and behavioral latency. A, D: Distributions of trial-by-trial correlations between duration of fixation and pursuit latency. A reanalyzes previously reported single-direction experiments in monkeys Xt and Re, while D reports results for the experiments in this paper, from the same two monkeys but for blocks of trials with two or four directions of randomly interleaved target directions. B, C, E: Scatter plots showing the trial-by-trial correlation of preparatory activity at the end of fixation with pursuit latency versus the modulation of preparatory activity across fixation. Each symbol shows results for a different experiment. Again, B and C show data for previous single-direction experiments in monkeys Re and Xt, and E shows data for multiple-direction experiments from both monkeys in the present paper. The dashed lines are the same in all three panels, allowing comparison of the samples. F: Scatter plot showing the relationship between neuron-pursuit latency correlation and correlation of preparatory activity with pursuit latency.