Figure 6.

Choice probability depends on preferred disparity. Squares correspond to data from monkey 1, circles to data from monkey 2. Panel a compares preferred disparity [degrees] with choice probability, showing a negative correlation (r_s = −0.43, P < 0.001, N = 71). Dashed lines mark the disparities of −0.2° and 0.2°, solid black lines the disparity of 0°, and choice probability of 0.5. In Panel b the average disparity tuning curve weighted by (choice probability − 0.5) is shown in red. Superimposed is the unweighted average disparity tuning curve in gray. In contrast to the unweighted average, the weighted average has a peak at disparities < 0°, and a trough at disparities > 0° (The trough arises because the weighted curve is dominated by near preferring neurons, which often show a trough in their response at small far disparities). Black lines as in Panel a.