Bolton, A. (2010). Individual differences in the effects of playing violent video games: Specific play rehearsals and changes in aggression. Dissertation Abstracts International, 70,

The four purposes of this study were to determine (a) whether playing a high-violence game compared to a low-violence game results in greater post-play aggressive behaviours and cognitions, (b) whether trait aggression interacted with this effect, with higher trait aggression predicting more aggression after exposure to violence, (c) whether differences in post-play aggression are the result of differences in each person’s unique experience with violence in the game (i.e. self-chosen violent game playing, motivations while playing), and (d) whether player personality characteristics influence these effects. Across two studies, players’ personality was assessed in the first session. Changes in post-play aggression (behaviour in Study 1, cognition in Study 2) were assessed in a second session. As predicted, more aggressive behaviour and aggressive cognition occurred after playing the high-violence (HV) vs. low-violence (LV) game, and the predicted interaction with trait aggression occurred, though only for Study 1. Thirdly, in Study 1, more violent play predicted greater aggressive behaviour in both the HV and LV games. Fourth, in the HV game only, trait aggression predicted more aggressive play and behaviour. Study 2 did not show the predicted relationships of trait aggression or game play with aggressive cognition. The influence of aggressive choices within a video game and potential mechanisms of media effects were discussed. (PsycINFO Database Record (c) 2012 APA, all rights reserved)