At the request of a reviewer, conventional peak amplitudes and latencies were extracted from ERPs referenced to linked mastoids (cf. supplementary Figures S1 and S2) or to the average of all recording sites (cf. supplementary Figures S3 and S4). These reference-dependent ERP component measures were analyzed for N1 at T7 and T8 (minimum between 100 and 600 ms) and P2 at Cz and Pz (maximum between 550 and 1400 ms), using the time intervals specified by Turetsky et al. (2008). The repeated measures ANOVAs included group (patients, controls), gender (male, female), intensity (weak, medium, strong), and hemisphere (T7, T8) or site (Cz, Pz) as independent variables.
