Figure 5.

The coherence and time dependence of evoked-saccade deviations. A, C, Scatter plots of Spearman's rank correlation coefficients (ρ) between the trial-by-trial magnitude of deviation and the coherence (abscissa) or viewing time (ordinate) of the motion stimulus. Points indicate values of ρ computed from individual sessions for monkeys At (A) and Av (C) for correct trials. Arrows are medians. B, D, Histograms of ρ between the trial-by-trial magnitude of deviation and the coherence- and time-dependent decision variable inferred from behavior on correct trials computed for individual sessions for At (B) and Av (D). Arrows indicate median values. Gray bars indicate counts corresponding to H₀: ρ = 0, p < 0.05. Positive values in A–D imply that the deviations tended to be larger on trials with more easily discriminable stimuli. E–H, Average deviations (z-scored per choice per session) from blocks of sessions for both monkeys combined (using the same sessions described for Fig. 4A–D), computed as the mean value in 100-ms-wide bins of viewing time offset in steps of 25 ms for each coherence (see inset in E). These plots include only data from correct trials and sessions in which ρ > 0 (from B and D). I–L, Same conventions as in E–H, but using only data from sessions in which ρ < 0. M, N, Best-fitting values of γ₁ (and SEMs) from Equation 6b, which quantifies the relationship between deviation magnitude and the strength and duration of the motion stimulus on the given trial, plotted as a function of session number. Lines are linear fits (H₀: slope = 0, p < 0.05 in both cases).