One might speculate that one reason it has been difficult to match human abilities in perception, motor control, common sense, and language understanding is that our brains have dedicated wetware for these functions—neural structures that have been optimized over evolutionary timescales. By contrast, logical thinking and skills like chess playing are not natural to us; so perhaps we are forced to rely on a limited pool of general-purpose cognitive resources to perform these tasks. Maybe what our brains do when we engage in explicit logical reasoning or calculation is in some ways analogous to
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