He suggests that speed training may build brain reserve – a kind of cognitive buffer against damage. If you assume cognition diminishes at a particular threshold of damage, then a brain with more neurons and connections is going to succumb later.

Albert adds that altered brain connectivity might also help people divide their attention more effectively, making it easier to navigate daily life as they age. This could then reduce isolation, encourage greater activity or increase social engagement – things known to contribute to long-term brain health.