“…Social interaction has been repeatedly validated as an index of anxiety-related behavior (see File and Seth, 2003) because it (social interaction) is decreased following anxiety-provoking stimuli, such as bright lights or exposure to cat odor (File, 1980;File and Hyde, 1978), after the administration of anxiogenic drugs (e.g., Battacharya et al, 1997;File and Lister, 1984;Guy and Gardner, 1985) or following withdrawal from drugs of abuse, including alcohol (Andrews et al, 1997;File et al, 1989File et al, , 1993Irvine et al, 2001;Kampov-Polevoy et al, 2000). Conversely, social interaction can be increased by prior exposure to the test arena (File, 1980;File and Hyde, 1978) or the administration of anxiolytic drugs at doses that have little effect on locomotor activity (Barnes et al, 1990;File, 1980;Lightowler et al, 1994).…”