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It seems that meta-analysis confirms the usefulness of things like dual-N-back training. Does anyone disagree?

https://www.gwern.net/DNB%20meta-analysis https://www.quora.com/How-does-dual-n-back-actually-increase...

For an n-back like exercise: http://cognitivefun.net/test/22

You need to read gwern's link more closely. Second paragraph:

This indicates that the medium effect size is due to methodological problems and that n-back training does not increase subjects’ underlying fluid intelligence

Most damningly, the review didn't turn up dose-dependent results. If n-back works, I would expect either "more is better" or "flat gain past some minimum". Instead, the effect vs training graph is a shapeless cloud, which seems like a major warning sign.

I think this is the only proven "brain training" that works, and the effect is temporary.

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