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2006-Padmanabhapillai-Suppression of early evoked gamma band response in male alcoholics.pdf

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2006-Padmanabhapillai-Suppression of early evoked gamma band response in male alcoholics

/locate/ijpsychoInternational Journal of PsychopSuppression of early evoked gamma band response in male alcoholics during a visual oddball task Ajayan Padmanabhapillai, Bernice Porjesz *, Mohini Ranganathan, Kevin A. Jones, David B. Chorlian, Yongqiang Tang, Chella Kamarajan, Madhavi Rangaswamy, Arthur Stimus, Henri Begleiter Department of Psychiatry, Neurodynamics Laboratory, SUNY Health Science Center, Brooklyn, NY, USA Received 28 December 2004; received in revised form 15 February 2005; accepted 3 March 2005 Available online 12 July 2005Abstract We investigated the early evoked gamma frequency band activity in alcoholics (n =122) and normal controls (n =72) during a visual oddball task. A time–frequency representation method was applied to EEG data in order to obtain phase-locked gamma band activity (29–45 Hz) and was analyzed within a 0–150 ms time window range. Significant reduction of the gamma band response in the frontal region during target stimulus processing was observed in alcoholic compared to control subjects. In contrast, significantly higher gamma band response for the non-target stimulus was observed in alcoholics compared to controls. It is suggested that the reduction in early evoked frontal gamma band response to targets may be associated with frontal lobe dysfunction commonly observed in alcoholics. This perhaps can be characterized by a deficient top-down processing mechanism. D 2005 Elsevier B.V. All rights reserved.Keywords: Gamma activity; EEG; Event-related oscillations; Alcoholism; Visual oddball task1. Introduction Gamma rhythms are important functional building blocks of brain electrical activity (Basar-Eroglu et al., 1996b). Oscillatory activities in the gamma range form a group of signals with common frequency characteristics but that are functionally related to diverse brain processes (Schurmann et al., 1995, 1997; Sannita et al., 2001). In humans, gamma activity has been observed in a variety of cognitive tasks involving selective a