Among the shortcomings of previous ERP studies examining the neurophysiology of auditory hallucinations are small sample sizes (e.g., n = 7 in Hubl et al., 2007). Although using ERP data of 75 right-handed patients allowed studying a reasonably-sized subgroup of 26 patients experiencing auditory hallucinations, the sample was heterogenous with regard to diagnostic criteria and medication status. However, it included 32 unmedicated participants, hallucinators and nonhallucinators did not differ in medication status, and previous research has not linked early neurophysiological deficits to antipsychotic medication (cf. Butler et al., 2007; Rosburg et al., 2008).
