Louise Kadayer says we've been "foolish" to think watching violence on screens every day wouldn't affect the way we act.
She's speaking after American psychologists analysed data and research over the last decade, to find a definite link between violence in video games and aggression in real life.
They also found violence in video games affected social behaviour, empathy and sensitivity to aggression.
Some video game developers and gamers have rejected their findings.
Mrs Kadayer also said she had seen a sharp rise in the number of people requiring treatment for anxiety and depression, who regularly played violent video games.
She told Premier: "We're completely kidding ourselves, because we know that one incident of trauma, a single exposure to a violent event - and that doesn't have to be an event in the real world... we know that can cause serious long term or short term damage.
"We're very foolish to think that we can watch things on the TV or watch things on a screen and them not affect us."
Vivienne Pattison, a Christian media campaigner, has called for parents to be more aware of the video games their children are playing, and for players to take their effects more seriously.
She told Premier's News Hour: "This is an education issue... I occasionally speak to parents and say, 'why do you allow your children to play 18 [rated] games?,' and they say 'because they're very skilled'.
"The numbers on the boxes are nothing to do with how capable you are... they're to do with the content of the games, and I think that's a message that we really need to get out there.
"Playing a violent video game could lead to aggressive or violent behaviour. It's just one of the things that could do that, and as such, needs to be taken seriously.
"I think we all need to think the kind of games that we're playing. Not all games available on the market are violent, but many of them are, and we need to be thinking about that... and what we allow our children to play within the genre."
Listen to Premier's Aaron James speaking to Louise Kadayer here:
Listen to Premier's Hannah Tooley speaking to Vivienne Pattison on the News Hour:
