(Matousek and Petersen, 1973a; John et al., 1980; Gasser et al., 1988b; Wackermann and Matousek, 1998; Dustman et al., 1999; Clarke et al., 2001; Boord et al., 2007). In a developmental study of error-related negativity (ERN), a related component to feedback negativity, Davies et al. (2004) demonstrated that the amplitude of the ERN increased from 7 to 17 years of age and the waveforms did not reach optimal level to those of young adults until mid-teens. Further, similar to our finding, Ladouceur et al. (2007) found that P3 amplitude during error-processing was greater in the adolescent group compared to the adult group. These studies lend support to our finding of P3 differences between age groups.
