2001; Corcoran et al., 2005; Good et al., 2006; Malaspina & Coleman, 2003; Moberg et al., 2006), negative symptoms in CHR patients were associated not only with poorer odor identification and right odor thresholds, but also showed a strong association with olfactory ERPs, with more negative symptoms linked to reduced N1 and P2 amplitudes. Moreover, a new finding is that healthy controls showed intraindividually a strong association between olfactory ERP amplitudes and odor detection, in that both N1 and P2 amplitudes increased monotonically on an individual basis with increases in odor intensity. These associations, however, were substantially weaker in CHR patients, which is a further indicator that certain characteristics of normal olfactory processing are disturbed in some but not all CHR individuals.
