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.
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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Isn't that kind of analogous to muscles though? If you practice pushups, it won't help much with your pull-ups.
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It's not analogous because muscles aren't a limited system. You build new muscle tissue This is extremely rare in animals and is a consequence of humans having varied roles and the danger of starvation - it lets your body cheap out on expensive muscle tissue that would be unused
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