Figure 2.

Dopaminergic modulation of probability distortion. A, Boxplot illustrating the drug effect (sulpiride-placebo) on the distortion parameter γ of the probability weighting function in the gain domain, across all participants. Box height represents the interquartile range (IQR), black line represents the median, and whiskers represent the largest and smallest values no further than 1.5*IQR. Single data points are values located outside the whiskers. B, Within-subject paired observations of γ estimates in the placebo and sulpiride conditions for both experimental groups (different illustration of the result presented in Fig. 2A). C, Fitted probability weighting function, based on the median estimates of δ (elevation) and γ (distortion) parameters across all participants. The shaded areas illustrate the variance of γ across participants, with the boundaries corresponding to the probability weighting function plotted with median δ, and 25th and 75th percentile γ.