THINKING, FAST & SLOW (DANIEL KAHNEMAN) - Listening books
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The Importance of Mental Effort in Hypnosis
Pupils are sensitive indicators of mental effort. They dilate substantially when people multiply two digit numbers and they dilate more if the problems are hard than if they are easy. The size of the pupil varied second by second, reflecting the changing demands of the task. We soon discovered that the shape of the response was an inverted V.
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