Interestingly, a small ERN-like component is sometimes evident on correct response trials (Falkenstein, Hoormann, Christ, & Hohnsbein, 2000; Ford, 1999; Gehring & Knight, 2000; Scheffers & Coles, 2000; Vidal, Hasbroucq, Grapperon, & Bonnet, 2000). Because of its similarity to the ERN, this component has been referred to as the correct response negativity (CRN; Ford, 1999). Authors have suggested that CRN reflects a response comparison process (Falkenstein et al., 2000; Vidal et al., 2000), an emotional reaction (Luu, Collins, & Tucker, 2000), uncertainty of a correct response (Coles, Scheffers, & Holroyd, 2001; Pailing, Segalowitz, Dywan, & Davies, 2002), or coactivation of correct and incorrect responses (Luu et al., 2000; Scheffers, Coles, Bernstein, Gehring, & Donchin, 1996; Vidal et al., 2000).
