Dopamine enhances model-free credit assignment through boosting of retrospective model-based inference.

Using simple effects, MFCA preferred the ghost-nominated vehicle in the levodopa condition (b = 0.15, F(1,240) = 15.45, p < 0.001), while the same effect was only marginally significant in the placebo condition (b = 0.05, F(1,240) = 2.77, one-sided p = 0.048).

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