Figure 3.

Comparison of neurophysiological and behavioral data between three conditions, in which two targets are separated by 180° (2T-180) or 90° (2T-90), or four targets are evenly spaced (4T). A, Temporal evolution of mean firing rates of neural pools located at 0° (solid), 90° (dashed), or 180° (dotted) relative to the coherent motion direction in the 2T-180 (green), 2T-90 (blue), and 4T (red) conditions. The temporal traces are aligned to target onset (left), motion onset (middle), and threshold crossing (right), respectively. The motion coherence is at 6.4%. B, Activity buildup rates, calculated over the time window of 190–320 ms after motion onset (indicated by a rectangle in A), versus motion coherence. Each data point and error bar represent the average and SEM over 1000 correct trials. C, D, Percentage of correct trials (C) and mean reaction time on correct trials (D) versus motion coherence for the 2T-180 (circles), 2T-90 (squares), and 4T (downward triangles) conditions. A total of 1000 trials are counted for each case. J_sim = 1.32 and J_opp = 1.01 in all panels.