Figure 3. Behavioural dependence of SC saliency coding (fixation-aligned).

A subset of the total fixations were extracted based on saccade-goal (that is, the direction of the next-saccade relative to the RF; top illustration). (a,b) Average normalized firing rate of SCs neurons associated with high (dark red) versus low (light red) saliency (upper versus lower tertiles), when next-saccades were directed in a versus b opposite the RF. (d,e) Average normalized firing rate of SCi neurons associated with high (dark blue) versus low (light blue) saliency, when next saccades were directed in d versus e opposite the RF. Shading along the response curves indicates ±1 s.e.m. Tick marks above the abscissa indicate significant differences between the response curves within the pre-saccadic epoch (5 ms bins, Wilcoxon paired-samples test, Bonferroni-Holm correction). The dotted vertical line in a,b and d indicates the time the response curves first differed. (c,f) Average normalized firing rate during the pre-saccadic epoch (0–200 ms) illustrated by the gray shaded regions in a,b,d and e. Error bars in c and f indicate ±1 s.e.m. *P<0.05, paired t-test, 1-tailed; NS=not statistically significant.