We assessed the influence of the variables outcome potential, feedback valence, magnitude, and probability on the amplitude of the feedback negativity (FN). Outcome potential was defined as the a priori valence of an upcoming feedback, that is, is there a potential win or potential loss? All these variables have been studied previously, although never together, but the findings have been contradictory. We analyzed the event-related potential (ERP) after feedback presentation in a reinforcement-learning task to examine the effects of all the variables on feedback negativity. Our results show that outcome potential, feedback valence, probability, and magnitude all influence feedback related ERPs. Taken together, the findings suggest that ERPs in the time range of the feedback negativity are primarily driven by positive outcomes (reinforcement) rather than negative outcomes (punishment).
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