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Baseline Pupil Size Seems Unrelated to Fluid Intelligence, Working Memory Capacity, and Attentional Control
Veera Ruuskanen1, Thomas Hagen2, Thomas Espeseth2,3
1Department of Psychology, University of Groningen, The Netherlands.
Journal of Cognition
|May 13, 2024
Summary
Resting-state pupil size does not appear to correlate with fluid intelligence, working memory capacity, or attentional control. This study found no significant relationship, suggesting any connection is likely weak or nonexistent.
Area of Science:
- Cognitive Neuroscience
- Psychology
Background:
- Previous research suggests a link between resting-state pupil size and cognitive functions like fluid intelligence, working memory, and attention.
- However, findings in this area have been inconsistent, necessitating further investigation.
Purpose of the Study:
- To replicate and expand upon prior research investigating the relationship between resting-state pupil size and cognitive abilities.
- To clarify inconsistent findings regarding pupil size and cognitive performance.
Main Methods:
- Two experiments were conducted, measuring resting-state pupil size in participants not engaged in tasks.
- Fluid intelligence was assessed using a matrix task.
- Working memory capacity and attentional control were also measured in one experiment.
- Demographic and personal variables (e.g., age, nicotine use) were controlled for.
Main Results:
- No significant relationship was found between resting-state pupil size (average or variability) and fluid intelligence.
- No significant relationship was observed between resting-state pupil size and working memory capacity or attentional control.
- These findings remained consistent even after controlling for confounding variables.
Conclusions:
- The study provides evidence against a substantial relationship between resting-state pupil size and key cognitive abilities.
- The results suggest that any potential link between resting-state pupil size and cognitive functions is likely negligible.
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