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We have amassed a huge body of knowledge about the brain. But because that knowledge is purely descriptive, not explanatory, we actually understand very little about how the brain works.
This was the central idea of Allen Newell's 1973 essay. We keep accumulating new neuropsychological observations -- by the 1000s. While these observations may seem locally interesting, they don't add up to a whole. We're missing a holistic theory. 47 years later, it remains true
You can't play 20 questions with nature and win.
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