Figure 4.

The effect of reward feedback on movement variability. The addition of noise in experiment 1 generated four potential types of outcome feedback. Participants could be rewarded when the hand reach angle was correct (Rewarded-In zone) or incorrect (Rewarded-Out zone). Conversely, reward could be withheld when the hand reach angle was incorrect (Unrewarded-Out zone) or correct (Unrewarded-In zone). a, b, Group means of the absolute change in reach angle after the four types of outcome feedback in the low-noise condition (a) and high-noise condition (b) of experiment 1. Filled black circles represent individuals subjects. *p < 0.05, **p < 0.01, ***p < 0.01.