There are a couple of different sub-topics I have found to be
the focus of research on video game and computer use by
children. The topic which has received the most attention is
violence, particularly the perceived correlation between violent
media and violent behavior in those who view violent
programming/play violent video games. As Andy W mentioned, there
are a lot of studies on this topic, and again as Andy W
mentions, there are claims that the research linking video games
and incidents of extreme violent behavior are faulty and fail to
acknowledge the significant methodological and constructional
divides between existing video game research and acts of serious
aggression and violence. Some studies go so far as to claim that
not only is the hypothesis that violent game playing was
associated with violent behavior unsupported by the evidence,
but focus on the improvements in visuospatial cognition. Edit: A
much more recent study also questions the validity of these
studies, while reporting some significan