[game_edu] Papers on the effects of play

[Malcolm Ryan]

I'm writing a grant proposal and I need some references about the  
effects of computer games on self-esteem and social relationships. So  
far all I have managed to find are studies which show that violent  
games increase agression and lower self-esteem.

Has anyone studied more constructive games, that are non-violent and  
cooperative? Does anyone have any positive findings about social  
computer-game play, or is it wholly negative?

Malcolm