“…This feedback-locked P300 refers to a positivity over parietal electrode sites that reaches a maximum about 300 ms after feedback onset. It is sometimes reported to be less sensitive to feedback valence (Yeung & Sanfey, 2004; but see Bellebaum & Daum, 2008;Bellebaum, Polezzi, & Daum, 2010;Hajcak, Moser, Holroyd, & Simons, 2007;van der Helden et al, 2010) but-at least in simple decision tasks-correlates with reward magnitude (Yeung & Sanfey, 2004) and reward probability (Hajcak, Holroyd, Moser, & Simons, 2005;Hajcak, Moser, Holroyd, & Simons, 2006;San Martin, Manes, Hurtado, Isla, & Ibanez, 2010) and, therefore, has been assumed to reflect the update of outcome expectancies in these tasks (e.g., Yeung & Sanfey, 2004). Recently, Chase, Swainson, Durham, Benham, and Cools (2011) showed that explicit rule-based adjustment in a probabilistic reversal learning task is predicted by the P300, whereas the FRN is linked only to reinforcement learning.…”