Figure 5.

Summary of choice-related activity in CIP and V3A. A, B, Distribution of firing rates for example CIP (A) and V3A (B) neurons (same as in Figs. 3, 4A,B) in response to the ambiguous 0° slant stimulus. Responses are sorted according to whether the monkey made a top-near (black) or top-far (white) choice. For the CIP neuron, the choice-related difference in responses yielded a choice probability significantly different from chance (grand CP = 0.65, p = 0.001). For the V3A neuron, there was no significant choice-related difference in responses (grand CP = 0.50, p = 0.36). C, D, Histograms of grand choice probabilities for all 65 CIP (C) and 23 V3A (D) neurons. Gray bars denote CPs that are significantly different from the chance value of 0.50 (p < 0.05, permutation test). Mean CPs are marked by triangles. E, F, Choice probability as a function of neuronal threshold (multiplied by $\sqrt{2}$). There is a significant negative correlation between CP and neuronal threshold in CIP (E) and no significant correlation between CP and neuronal threshold in V3A (F). Solid lines show linear fits and dashed lines show 95% confidence intervals for the slope. Filled symbols denote CPs significantly different from chance (0.50, p < 0.05, permutation test). Different symbols correspond to different animals.