All articles tagged with #pupil dilation
Researchers tracked 63 adults as they predicted colors on a screen while their pupil size and brain activity were recorded. They found that surprise-triggered pupil dilation aligns with arousal signals in the locus coeruleus/norepinephrine system and EEG markers, helping the brain refresh context, adjust learning, and reduce perceptual bias when predictions are violated.
A tightly controlled study with 16 six-month-olds found spiders paired with color-matched flowers elicited greater pupil dilation than flowers alone, suggesting an early bias in attention/arousal to spiders. A second test with snakes vs. fish showed no difference, highlighting interpretive debates about whether this reflects prepared fear or other factors. Researchers caution that small sample size and potential image complexity limit conclusions and call for further work with constructed stimuli.
Dilated pupils in elderly cats are often due to iris atrophy, a harmless age-related change, but can indicate serious health issues like glaucoma or brain problems if accompanied by other symptoms. Owners should monitor their cats' behavior and seek veterinary attention if they notice additional signs of illness.
A study links pupil dilation to working memory performance, suggesting that eye measurements could serve as a non-invasive way to assess and improve focus and cognitive function, with potential applications in education and clinical settings.
New research suggests that pupil dilation during very light exercise could serve as a predictive marker for exercise-induced cognitive improvements. The study found that pupils dilated during exercise and the extent of dilation was associated with subsequent improvements in executive function performance. The researchers also observed increased activity in the prefrontal cortex during an executive function task after exercise. These findings highlight the role of the brain's arousal system in the cognitive benefits of exercise and suggest that pupil diameter changes could be a novel biomarker for understanding the effects of exercise on the brain.