I just found an interesting study about this that was published last December in Neuron. It was an online test with tens of thousands of respondents, and they concluded that intelligence has three distinct elements: memory, reasoning, and verbal competence. The authors are challenging conventional IQ testing, which isn't new, but here's what I found noteworthy: "Intriguingly, people who regularly played computer games did perform significantly better in terms of both reasoning and short-term memory."
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