The early phase-locked gamma has been considered to represent an important processing stage related to the selection and identification of target stimuli, indicative of top-down mechanisms involved in selective attention [105,106,154]. This phase-locked or evoked gamma is larger for attended stimuli compared to unattended stimuli, particularly over frontal regions [79,155], while the induced gamma oscillations have been associated with a wide range of cognitive processes, object representation, and learning [106,156,157]. Although many studies have examined the gamma band ERO activity in healthy individuals, such studies are very rare in clinical disorders including alcoholism.
