WOODBURY - The Newtown, Conn. school massacre is bringing national attention to violent video games because of reports that the gunman spent hours playing them.

In the days following the Sandy Hook Elementary School shooting, a portrait of the 20-year-old shooter, Adam Lanza, has begun to emerge. His brother, Ryan Lanza, says he was diagnosed with autism and suffered from a personality disorder. People who knew him say he was isolated from his peers and community and that he was obsessed with video games.

Social worker Mindy Perlmutter says studies show there may be a connection between prolonged video game participation and aggression.

The Journal of Experimental Social Psychology published a study that found "people who played a violent video game for three consecutive days showed increases in aggressive behavior and hostile expectations each day they played."

While no one has shown conclusively that playing video games will compel a person to commit violent acts, some are acknowledging that they could play a role. GamerFitNation, a video game blog, has called for a moratorium on violent online gaming this Friday to honor the victims of the Sandy Hook shooting.