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Unexpected false feelings of familiarity about faces are associated with increased pupil dilations

View ORCID ProfileKirsten Ziman, View ORCID ProfileJeremy R. Manning
doi: https://doi.org/10.1101/2021.02.22.432360
Kirsten Ziman
1Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH 03755
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Jeremy R. Manning
1Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH 03755
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  • For correspondence: jeremy.r.manning@dartmouth.edu
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Abstract

Our subjective sense that something we encounter is familiar to us is reflected by changes in pupil size. Although pupil dilation effects of familiarity have been well documented, familiarity is not the only, or even the strongest, contributing factor to pupil dilation. Changes in pupil dilation also reflect changes in brightness, affective or emotional responses, hormonal release, expected value or utility, and surprise, among others. Because many factors can affect pupil dilation, important questions remain about how pupil dilation changes reflect high-order cognitive processes, like attention and memory. For example, because surprise and familiarity are often difficult to fully distinguish (since new experiences can be surprising or unexpected), it can be difficult to tease apart pupil dilation effects of surprise versus familiarity. To better understand the effects of surprise and familiarity on pupil dilation, we examined pupil responses during a recognition memory task involving photographs of faces and outdoor scenes. When participants rated novel face images as “familiar,” we observed a robust pupil dilation response.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://github.com/ContextLab/pupil-memory-analysis

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted February 23, 2021.
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Unexpected false feelings of familiarity about faces are associated with increased pupil dilations
Kirsten Ziman, Jeremy R. Manning
bioRxiv 2021.02.22.432360; doi: https://doi.org/10.1101/2021.02.22.432360
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Unexpected false feelings of familiarity about faces are associated with increased pupil dilations
Kirsten Ziman, Jeremy R. Manning
bioRxiv 2021.02.22.432360; doi: https://doi.org/10.1101/2021.02.22.432360

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