The purpose of the present study was to experimentally examine the influence of a self-aggressive model on self-aggressive behavior under controlled laboratory conditions. Participants (N= 94) were given the opportunity to self-administer electric shock while competing with a fictitious opponent in a reaction-time task. Participants observed the opponent self-administer either increasingly intense shock (a self-aggressive model) or constant low shocks (a non-self-aggressive model). Self-aggression was defined as the intensity of shock that was self-administered by participants. Results provide support for the notion that social information can influence the expression of self-aggressive behavior. Specifically, participants attended to the opponent's shock choices in both model conditions, and chose shocks consistent with those of the observed model.