Studies investigating EEG coherence in SZ are less consistent. On one hand, several studies have reported increased coherence at rest (Merrin et al. 1989; Nagase et al. 1992; Mann et al. 1997; Wada et al. 1998). Specifically, delta oscillations at rest were increased in SZ both within a hemisphere (Wada et al. 1998) and across hemispheres (Nagase et al. 1992). Likewise, increased intra-hemispheric coherence during rest across all frequency bands was observed in patients and their relatives (Mann et al. 1997). However, Yeragani and colleagues reported reduced inter-hemispheric coherence in the beta and gamma range in SZ (Yeragani et al. 2006). Taken together, increased low-frequency power and coherence may characterize resting EEG in SZ.
