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And even besides the people with low IQ, most everyone is only capable of thinking abstractly some of the time--and even then only after years of cognitive development[1]. System 2 thinking[2] is taxing to the brain (consumes more glucose/oxygen/etc), and is switched out of whenever it's not absolutely necessary.

[1] http://en.wikipedia.org/wiki/Piagets_theory_of_cognitive_dev...

[2] http://en.wikipedia.org/wiki/Dual_process_theory

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