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Yeah, a little bit, but the improvement is marginal compared to the intrinsic "default" capacity of the brain. This biological computer of ours works remarkably great even without constant stimuli and training.

Of course there's gonna be a little difference if a person activates his brain intensively and on specific, tailor-made tasks, instead of just sitting on a couch smoking pot all day.

But as I said, the effect is marginal (that's a conclusion we can already make based on the small studies) and therefore you have to first ask if its worth the effort and second, what it is really good for. Will it improve a person's life in a significant way, that's what it comes down to.

So even if I personally already assume that video games probably have a measurable positive effect on some properties of cognitive capability, I think it's a weak argument to promote video gaming.