title: Effect of unexplained arousal on affiliation.
mesh_terms: D001143:Arousal / Q000187:drug effects; D002110:Caffeine / Q000494:pharmacology; D003071:Cognition; D004644:Emotions; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D010919:Placebos
chemical_list: D010919:Placebos; D002110:Caffeine