There's evidence that doing cognitive tasks can really improve the performance and change brain structure as well. But what's curious about it is, is that sort of like you might do on a computer or whatever tend to train certain areas and certain functions, but they don't necessarily have crossover onto other areas. And that's why I was really interested in the physical activity effect, because physical fitness and performance seems to have effects on the whole brain. So we talked to the beginning about social isolation and being socially active and being engaged with your community. These are things that pull on loads of different tasks of your brain. That's probably what underpins why social activity is so important to maintain a healthy brain

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