Fig. 1: Midbrain DRT is distributed similarly across groups.

The midbrain DRT measure was distributed similarly in both groups receiving standard feedback in Studies 1 (n = 14 subjects) and 2 (n = 28 subjects) and the control group receiving inverted feedback in Study 1 (n = 17 subjects). Accordingly, we found no evidence supporting a main effect of feedback type on transfer. However, midbrain DRT varied substantially across individuals, which motivated the analyses of non-midbrain DRT, assessing correlations with individual midbrain DRT at the whole-brain level.