Good and bad feelings are what natural selection used to goad animals into, respectively, approaching things or avoiding things, acquiring things or rejecting things; good feelings were assigned to things like eating and bad feelings to things like being eaten. Over time, bit by bit, animals got smarter, but the point of smarts, from natural selection’s perspective, isn’t to replace feelings but rather to make them better informed: intelligence helps animals do a more sophisticated job of figuring out what to approach or avoid, acquire or reject—that is, what to feel good about or bad about.
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