Recent studies show that heavy gamers are more depressed than moderate gamers - but is gaming the cause?
It's about 4pm, and an internet café in Sydney’s CBD is about half full.
The crowd of gamers are mainly university students fresh from their latest classes, blasting their way through a first-person shooter, or scurrying across the battlegrounds of a role-playing odyssey.
Some are in groups of four or five, hurling insults at each other as they play. Others are hunched over their keyboards - silent and focused.
Staff here say if a customer plays for six to eight hours they're asked to stop.