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Baseline pupil diameter does not correlate with fluid intelligence.

Matthew K Robison1, Stephen Campbell2

  • 1Department of Psychology, University of Texas at Arlington, Arlington, TX, USA. matthew.robison@uta.edu.

Psychonomic Bulletin & Review
|April 3, 2023
PubMed
Summary
This summary is machine-generated.

Resting pupil size does not reliably predict cognitive abilities like intelligence. Current research provides strong evidence against using baseline pupil diameter to infer the role of the locus coeruleus-norepinephrine system in cognitive function.

Keywords:
IntelligencePupilWorking memory

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Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • A prior study suggested a positive correlation between baseline pupil diameter and fluid intelligence, linking it to the locus coeruleus-norepinephrine (LC-NE) system.
  • This proposed link has been debated, with recent replication attempts failing to support the original findings.

Purpose of the Study:

  • To investigate the correlation between baseline pupil diameter and cognitive abilities, specifically fluid intelligence.
  • To re-evaluate the proposed role of the LC-NE system in individual differences in cognitive function.

Main Methods:

  • Empirical investigation of the relationship between resting-state pupil diameter and cognitive performance.
  • Analysis of data to assess the replicability of previous findings.

Main Results:

  • Substantial evidence was found against a positive correlation between baseline pupil diameter and intelligence.
  • The findings contradict the hypothesis that pupil diameter reflects LC-NE system activity related to cognitive abilities.

Conclusions:

  • Individual differences in baseline pupil diameter are not a valid indicator for the involvement of the LC-NE system in goal-directed cognitive activity.
  • The findings challenge previous interpretations linking pupil dynamics to higher-order cognitive functions and the underlying neural mechanisms.