“…Reduced ERN amplitudes were shown in schizophrenia (e.g., Foti, Kotov, Bromet, & Hajcak, ; Perez et al, ), substance use disorders (e.g., Luijten et al, ), and inconsistently in autism and attention‐deficit/hyperactivity disorder (ADHD; for reviews, see Gillan et al, ; Luijten et al, ; Manoach & Agam, ). In schizophrenia and substance use disorder (SUD), results from illness course (Foti et al, ), treatment studies (Houthoofd et al, ), and high‐risk populations (Euser, Evans, Greaves‐Lord, Huizink, & Franken, ; Perez et al, ; Simmonite et al, ) support that error‐processing deficits qualify as endophenotypes. This is further confirmed by longitudinal studies showing that reduced ERN predicted relapse in SUD (Luo et al, ; Marhe, van de Wetering, & Franken, ) and initiation of tobacco use (Anokhin & Golosheykin, ).…”