Population results of gain field analysis. All neurons with nonvertical orientation are included (n = 59). A, Histogram of gain coefficients (gc) in the single-target task to the preferred target (SP, left) and in the choice task with selection of the preferred target (CP, right). Cells with gc significantly different from 0 are shown in dark (p < 0.05). Vertical line indicates the mean gc. B, Scatter plot of gc in the CP task versus the SP task. Circles, T1 cells; squares, T2 cells. Thin solid line, Unity line; gray and dotted lines, linear regression and 95% confidence limits (not significantly different from unity). C, Regression of gc versus the BTD difference between left and right FP conditions. Circles, Individual neurons. Thin solid line, 0 line. Gray and dotted lines, Linear regression and 95% confidence limits (no significant correlation).