Figure 3.

Summary of modulation by choice (A) and coherence (B) across epochs in the population of 129 neurons. Each row represents a single neuron across epochs. Activity in different task epochs was tested separately. Neurons are sorted separately in A and B, as described below. A, Colors represent IN target location of cells showing choice-dependent activity (see color scale to the right). For each neuron, only two motion directions were used and saccade targets corresponded to the motion directions. IN target refers to the preferred target location of the two alternatives. White entries indicate no choice dependence (Wilcoxon rank-sum test, p ≥ 0.05). Neurons are sorted by direction preference in successive epochs. Black circles in the leftmost column indicate cells with bias activity. B, Colors represent the slope of coherence modulation based on a linear regression (see color scale to the right). Positive/negative values imply increasing/decreasing neural responses as a function of coherence. White indicates no significant coherence modulation (F test, p ≥ 0.05). For each epoch, the left and right vertical columns represent IN and OUT choices, respectively. Neurons are sorted by slope values of successive columns in descending order. Black circles in the Stim epoch indicate cells with bias activity during the Pre epoch. Blue and red circles at the right identify evidence accumulation and evaluation activity for each epoch, respectively.