All subjects completed three MEG recording sessions and also underwent a structural MRI scan. First, they took part in an introductory session in which they provided detailed information on their medical history, family history of alcoholism, quantity and frequency of alcohol use (modified from Cahalan et al., 1969), severity of their alcoholism-related symptoms (SMAST, Selzer, 1971), and handedness (Oldfield, 1971). In addition, the following questionnaires were used in order to obtain a comprehensive dispositional profile of each subject, with particular respect to disinhibitory, novelty seeking and socialization traits: Childhood Hyperactivity Questionnaire (HK/MBD, Tarter et al., 1977); Eysenck Personality Questionnaire (EPQ, Eysenck and Eysenck, 1975); Socialization Scale of the California Psychological Inventory (Gough, 1994); Zuckerman Sensation Seeking Scale (Zuckerman, 1971). Furthermore, during this session subjects were familiarized with the experimental procedure and laboratory setting by participating in a brief MEG recording, with the purpose of reducing the potential effects of situation-induced arousal (Maltzman and Marinkovic, 1996).
