<Li> 3 . Black & Bevan (1992) had movie - goers fill out an aggression questionnaire before and after watching a movie . Procedure: Subjects were randomly selected as they went to view either a violent or a romantic film . They were asked to fill out pretest and posttest questionnaires on their emotional state . Result: Those who watched violent films were already aggressive before viewing the film but it was aggravated after the viewing while there was no change in those who viewed romantic films . </Li> <Li> 4 . Anderson & Dill (2000) randomly assigned college students to play two games; Wolfenstein (a science fiction first - person shooter game) and Tetris . This study has sometimes been criticized for using poorly validated aggression measures, and exaggerating the consistency of its findings (Ferguson, 2009). </Li> <Li> 5 . Bartholow & Anderson (2002) examined how playing violent video games affect levels of aggression in a laboratory . Procedure: A total of 22 men and 21 women were randomly assigned to play either a violent or non-violent video game for ten minutes . Then competed in a reaction time task . Punishment level set by opponents measured aggression . Results: The results supported the researchers hypothesis that playing the violent video game would result in more aggression than the non-violent game . In addition, results also pointed to a potential difference in aggressive style between men and women . </Li> <Table> <Tr> <Td> </Td> <Td> hide This section has multiple issues . Please help improve it or discuss these issues on the talk page . (Learn how and when to remove these template messages) <Table> <Tr> <Td> </Td> <Td> This section needs expansion with: further content sourced from high quality secondary sources, to add to this unsourced material appearing heretofore only in the lede, that make clear the broad general conclusions that were drawn from the 1961 - 1965 studies, what long - term impact they have had, and how they relate to observational learning and social learning theory, integrating Bandura's books, currently omitted, in the discussion . You can help by adding to it . (July 2015) </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> (Learn how and when to remove this template message) </Td> </Tr> </Table>

In the bobo doll experiment what seemed to inhibit the children's imitation of aggressive behavior