
Psychology of Video Games
The more a game fulfilled a player's sense of independence, achievement and connectedness to others, the more likely he or she was to keep playing, Dr. Scott Rigby of Immersyve, a Florida-based virtual environment think tank, and colleagues from the University of Rochester in New York found. And the more fully a player's needs were satisfied, the better he felt after playing.
Ref. https://news.yahoo.com/s/nm/20070118/hl_nm/video_game_dc