Several studies have investigated the early, evoked auditory GBR associated with sensory registration of auditory stimuli (Pantev et al., 1991) using evoked power or PLF measures in schizophrenia. Clementz (Clementz et al., 1997) initially observed early abnormalities in auditory evoked gamma power, and multiple subsequent studies (Basar-Eroglu et al., 2009; Hall et al., 2011a; Hall et al., 2011b; Hirano et al., 2008; Krishnan et al., 2009; Leicht et al., 2010a; Leicht et al., 2010b; Lenz et al., 2011; Roach and Mathalon, 2008; Teale et al., 2008), but not all (Blumenfeld and Clementz, 2001; Brenner et al., 2009; Brockhaus-Dumke et al., 2008a; Spencer et al., 2008a), have reported reduced evoked power or PLF in the gamma band. However, the selective examination of these two measures limits our ability to adequately describe the stimulus-driven activity of neuronal assemblies. Evoked power reflects the amplitude of the oscillations that are phase-locked to a stimulus event, since averaging across trials tends to cancel out non-phase locked oscillatory activity. Accordingly, because the evoked power measure initially requires some consistency of phase across single trials, and then
