Tobias Greitemeyer

TL;DR: This meta-analysis integrates the bystander literature from the 1960s to 2010, provides statistical tests of potential moderators, and presents new theoretical and empirical perspectives on the novel finding of non-negative bystander effects in certain dangerous emergencies as well as situations where bystanders are a source of physical support for the potentially intervening individual.

TL;DR: Data from 98 independent studies revealed that for both violent video games and prosocial video games, there was a significant association with social outcomes, indicating that video game exposure causally affects social outcomes and that there are both short- and long-term effects.

TL;DR: Experiments examined the hypothesis that playing a prosocial (relative to a neutral) video game increases helping behavior and showed that exposure to prosocial video games activated the accessibility of prosocial thoughts, which in turn promoted prosocial behavior.

TL;DR: In this article, a meta-analytic test of the proposed causal cognition-emotion-behaviour sequence reveals that judgements of responsibility determine the emotional reactions of anger and sympathy, and that these emotional reactions, in turn, directly influence help giving and aggression.

TL;DR: It was demonstrated that the longer people are active on Facebook, the more negative is their mood afterwards, and this effect is mediated by a feeling of not having done anything meaningful.