Drabman, R. S., & Thomas, M. H. (1974). Does media violence increase children’s toleration of real-life aggression? Developmental Psychology, 10 (3), 418-421.

Abstract:  Randomly divided 22 male and 22 female 3rd and 4th graders into groups for a 2 * 2 (Sex * Film/No Film) factorial design. Ss in the aggressive film group saw a cowboy film that depicted many violent events. All Ss were led to believe that they were responsible for watching the behavior of 2 younger children whom they could see on a videotape monitor. The younger children at first played quietly, then became progressively destructive. Their altercation culminated in a physical fight ending with the apparent destruction of the television camera. The dependent measures were (a) the time it took an S to seek adult help after the younger children began to be disruptive and (b) whether or not the S waited until the younger children had begun to abuse one another physically before seeking adult help. Results show that (a) Ss who saw an aggressive film took longer to seek adult help than Ss who did not see the film and (b) Ss in the film group were much more likely to tolerate all but violent physical aggression and destruction before seeking help. (PsycINFO Database Record (c) 2004 APA, all rights reserved)