You can't compare the effect of multimedia-tasking and the effect of playing action games. They have totally different effects on different aspects of cognition, perception and attention.

We need to go beyond saying, 'I know what these games do because I see my son playing them,' and try to understand the complexities - that different video games have different effects.

We know there are good sugars and bad sugars, and we don't discuss whether food in general is good or bad for us. We need to be far more nuanced when we talk about the effects of video games.

Studies of social games, puzzle games, and brain-training games have shown they have little effect on the brain despite often being marketed as improving memory and reaction speeds.

When people play action games, they're changing the brain's pathway responsible for visual processing. These games push the human visual system to the limits, and the brain adapts to it.

Everybody thought that screen time was bad for vision. Well, it happens that spending a lot of time reading on a computer is bad for your vision, but spending a lot of time playing first-person-shooter games is good for your vision.