Significant phase locking of EROs was found to occur within and between brain areas in both humans and rats, as has been previously described (Fell et al., 2008; Freunberger et al., 2009; Grabner et al., 2007; Gysels and Celka, 2004; Hanslmayr et al., 2005; Jensen, 2005; Moore et al., 2006; Munk et al., 1996; Roelfsema et al., 1997; Schack et al., 2005; Siapas et al., 2005; van Wingerden et al., 2010). In the present study, a similar auditory event-related potential paradigm was used in male humans and male rats in order to explore effects of ethanol on phase locking of EROs in specific frequency bands. Our study is unique in that the same stimuli, data recording, and analysis techniques were used in human and rats, although the rats were not required to respond to the stimuli, which limits some of the applicability. We found that the degree of phase locking at cortical sites in humans was highest in the delta frequencies; however, in rats it was highest in the beta and gamma frequencies. Several authors have suggested that oscillations in
