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THINKING, FAST & SLOW (DANIEL KAHNEMAN) - Listening books
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The Effect of Mental Multiplication on Pupil Size
When we exposed our subjects to more digits than they could remember, their pupils stopped dilating or actually shrank. The pupil data corresponded precisely to subjective experience. Longer strings reliably caused larger dilation. Add One with four digits caused a larger dilation than the task of holding seven digits for immediate recall. This is as hard as people can work. They give up if more is asked of them.
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