Pupil Size and Intelligence

Are the eyes the windows to intelligence? In an interesting paper, Georgia psychologists Jason S. Tsukahara and colleagues report that there’s a positive correlation between pupil size and cognitive ability.

It’s well known that our pupil size varies over time due to changes in both emotional state and cognitive ‘effort’. As Tsukahara et al. put it
Starting in the 1960s it became apparent to psychologists that the size of the pupil is related to more than just the amount of light enterin

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