Kirsh, S., & Mounts, J. (2007, July). Violent video game play impacts facial emotion recognition. Aggressive Behavior, 33(4), 353-358. Retrieved June 27, 2009, doi:10.1002/ab.20191

This study assessed the speed of recognition of facial emotional expressions (happy and angry) as a function of violent video game play. Color photos of calm facial expressions morphed to either an angry or a happy facial expression. Participants were asked to make a speeded identification of the emotion (happiness or anger) during the morph. Typically, happy faces are identified faster than angry faces (the happy-face advantage). Results indicated that playing a violent video game led to a reduction in the happy face advantage. Implications of these findings are discussed with respect to the current models of aggressive behavior. (PsycINFO Database Record (c) 2008 APA, all rights reserved)(from the journal abstract)