Why does it seem like we can improve our bench press, minutes-per-mile, or alcohol tolerance much more than we can increase our IQ? Can a person with a 100 IQ get a 120 score after training? 130? Seems quite believable to me.
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Maybe our brains don't get bigger, but they get more connected. Your liver doesn't 2x like your biceps do, but it certainly gets better at processing something you keep giving it.
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Training a limited system to be more efficient at a specific task is certainly possible; you can improve at any skill - that's what learning is. Learning skills absolutely doesn't translate into improving your overall mental acuity.
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