(Kopp and Rist, 1999; Mathalon et al., 2002; Bates et al., 2002). There is some evidence that reduced ERN is modulated by clinical state in schizophrenia, because ERN amplitude increased after successful treatment with atypical antipsychotics (Bates et al., 2004). However, the observed ERN impairments were nonetheless rather robust and suggestive of a trait deficit in schizophrenia. At the same time, other response-related ERP components, such as the correct response negativity (CRN) or the ensuing positivity to errors (Pe) and correct responses (Pc), appear to be unaffected in schizophrenia or yielded inconsistent results (Alain et al., 2002b; Mathalon et al., 2002; Bates et al., 2002, 2004; Kim et al., 2006).
