The efficacy of brain training programs has been dispelled multiple times. This is because we can’t necessarily train ourselves to be more intelligent, strictly speaking. We can, however, engage our brains in multiple and novel ways, and somewhat indirectly, become smarter as a result of that neural strengthening. We can improve our fluid intelligence, but not our crystal intelligence. This means that when we want to boost our brains, we’re not really focusing on “improving” the brain itself, but rather how to stimulate it and adapt to different situations.

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