Researchers found that pupils' size fluctuates with attention, arousal, and anger and may be linked to intelligence. A study in Attention, Perception, & Psychophysics suggests a correlation between working memory and pupil size, measured during a common test. Those with more pupil dilation performed better, indicating a connection with working memory.
The part of the brain controlling pupil dilation is the same under stress and focus on cognitive tasks. Study co-author Lauren Garner explains this phenomenon, emphasizing that their research focused on individual differences.
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