## Video Games

#### Violent video games do not cause mass shootings: there is no relationship between aggressive behaviour and time spent on violent video games.

*   [Oxford Internet Institute: Przybylski & Weinstein 19](https://royalsocietypublishing.org/doi/10.1098/rsos.171474) [(cited)](http://www.ox.ac.uk/news/2019-02-13-violent-video-games-found-not-be-associated-adolescent-aggression#)
    *   Researchers have found **no relationship** between aggressive behaviour in teenagers (n=1004) and the amount of time spent playing violent video games.
    *   “The study is one of the **most definitive to date**, using a combination of subjective and objective data to measure teen aggression and violence in games. Unlike previous research on the topic, which relied heavily on **self-reported data** from teenagers, the study used information from parents and carers to judge the level of aggressive behaviour in their children.
*   [The Quarterly Journal of Economics: Dahl & Dellavigna 09](https://eml.berkeley.edu/~sdellavi/wp/moviescrimeQJEProofs2009.pdf)
    *   Causal evidence on the **effect of exposure** to media violence on **violent crime**, using data from violent films
    *   Exposure to violent movies has three main effects on violent crime:
        *   It significantly **reduces violent crime** in the evening on the day of exposure
        *   by an even larger percent, it reduces violent crime during the night hours following exposure
        *   It has no significant impact in the days and weeks following the exposure.