It could be the other way around. That the human mind evolved in to a more calculator mode of operation with the advent of civilisations due to farming, and the need for complex societal interactions and war. Those communities that had less of the computer brained were disadvantaged and more likely to be wiped out or enslaved.
I say that in part because dyslexics often have wonderful capabilities, such as a friend who can lie in bed and see her day more clearly than when she experienced it.
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