Factor scores of two targeted CSD-PCA factors corresponding to N1 and P2 were submitted to repeated measures ANOVAs with group (patients, controls) and gender (male, female) as betweensubjects factors, and odor intensity (weak, medium, strong) as a within-subjects factor. As there were no specific hypotheses regarding sex differences for olfactory function in the CHR patients, and because the sample included almost twice as many male than female participants in each group, gender was only considered as a control factor in all statistical analyses. The selection of recording sites for comparing experimental effects in these ANOVAs was guided by our previous findings using a 31-channel EEG montage (Kayser et al., 2010) and by means of randomization tests (cf. Maris, 2004; Mewhort et al., 2010) evaluating the topographic differences between H2S stimuli pooled across intensities and blank air. For a given CSD factor, randomization distributions (10,000 repetitions) were estimated from the observed data of the entire sample (N = 41) to compute univariate (channel-specific) T2 statistics for paired samples (see Kayser et al., 2007, for computational details), which allowed determination of regional
