Zillmann, D., & Weaver, J. B. III. (1997). Psychoticism in the effect of prolonged exposure to gratuitous media violence on the acceptance of violence as a preferred means of conflict resolution. Personality and Individual differences, 22 (5), 613-627.

Abstract:  210 undergraduate Ss viewed films featuring no violence, old-style violence, gratuitous violence, or horror in a prolonged-exposure, delayed-measurement paradigm. Ss had been classified as low vs high in psychoticism weeks prior to film viewing. Delayed measures were the acceptance of violence as a means of conflict resolution, crime apprehension, evaluation of police brutality, and the endorsement of the death penalty for perpetrators of violent crime. Females, whether low or high in psychoticism, were not appreciably affected by watching any of the violent genres. Similarly, males in the lower half of psychoticism were not appreciably affected. In contrast, males in the upper half of psychoticism, estimated to represent half the population, were significantly affected. Overall, consumption of gratuitous violence consistently fostered greater acceptance of violence as a means of conflict resolution. Males and Ss in the upper half of psychoticism, endorsed the death penalty more strongly after gratuitous violence than after viewing alternative genres. (PsycINFO Database Record (c) 2004 APA, all rights reserved)