Pupil Diameter and Load on Memory
Abstract
During a short-term memory task, pupil diameter is a measure of the amount of material which is under active processing at any time. The pupil dilates as the material is presented and constricts during report. The rate of change of these functions is related to task difficulty.
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Anything that increases the brain's processing load will dilate the pupil.
“Kahneman and Beatty (Kahneman and Beatty 1966) established that 'anything that increases the brain's processing load will dilate the pupil.'”
From Human-Clinical AI Agent Collaboration (2025) · cites this paper as Kahneman and Beatty 1966
There is a fundamental mismatch between the dynamic nature of human cognition and the static interaction patterns of current Clinical AI systems.
“we identify a fundamental mismatch between the dynamic nature of human cognition and the static interaction patterns of current Clinical AI systems.”
From Human-Clinical AI Agent Collaboration (2025) · cites this paper as Kahneman and Beatty 1966
Pupil dilation reliably indicates cognitive load when controlling for luminance and accommodation.
“Fifty years of research demonstrates that pupil dilation reliably indicates cognitive load when controlling for luminance and accommodation.”
From Human-Clinical AI Agent Collaboration (2025) · cites this paper as Kahneman and Beatty 1966
When a participant reads a question or is presented with a problem to solve, his/her pupil diameter increases steadily until he/she provides an answer, at which point the pupil diameter decreases again.
“In general, when a participant reads a question or is presented with a problem to solve, his/ her pupil diameter increases steadily until he/she provides an answer, at which point the pupil diameter decreases again (Kahneman and Beatty 1966).”
From Measuring physician cognitive load: validity evidence for a physiologic and a psychometric tool (2017) · cites this paper as Kahneman and Beatty 1966
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RetractedPupil-linked arousal signals track the temporal organization of events in memory
Clewett, D., Gasser, C., & Davachi, L. (2020) · Nature Communications · doi:10.1038/s41467-020-17851-9 · Cited by 154 · see citing works
Phasic Not Tonic Pupillary Responses Vary With Auditory Vigilance Performance
Beatty, J. (1982) · Psychophysiology · doi:10.1111/j.1469-8986.1982.tb02540.x · Cited by 163 · see citing works
Self-citationPupillary responses in a pitch-discrimination task
Hahnemann, D., & Beatty, J. (1967) · Perception & Psychophysics · doi:10.3758/bf03210302 · Cited by 162 · see citing works
Self-citationPerceptual Deficit during a Mental Task
Kahneman, D. J., Beatty, J., & Pollack, I. W. (1967) · Science · doi:10.1126/science.157.3785.218 · Cited by 162 · see citing works
Self-citation
- Authors
- Kahneman, D., & Beatty, J.
- Affiliations
- Harvard University (US)
- University of Michigan (US)
- Venue
- Science
- Published
- 1966-12-23
- Volume
- 154
- Issue
- 3756
- Pages
- 1583-1585
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1976339519
- Cited by
- 1,617
- References
- 7
- Citations by year
- 2026: 98 · 2025: 127 · 2024: 101 · 2023: 92 · 2022: 111 · 2021: 117 · 2020: 113 · 2019: 121 · 2018: 113 · 2017: 76 · 2016: 87 · 2015: 79 · 2014: 56 · 2013: 58 · 2012: 33
- FWCI
- 9.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Abilities and Testing
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Keywords
- pupil size, short-term memory, memory load, pupil dilation, miosis, task difficulty, active processing, visual attention
- MeSH terms
- Adult, Female, Humans, Memory, Pupil
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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