“…Atypically enhanced activity in the delta and theta EEG frequency bands has frequently been reported in schizophrenic patients, whereas alpha activity is often attenuated in these patients (Rockstroh et al 1997;Shagass 1991;Winterer and Herrmann 1995); however, results vary considerably between studies. Inconsistencies may result from different patient samples (acute or chronic states, medicated or unmedicated, younger or older subjects, prominent negative or positive symptoms, diagnostic categories, etc.)…”