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Dynamic arousal signals construct memories of time and events

View ORCID ProfileDavid Clewett, Camille Gasser, View ORCID ProfileLila Davachi
doi: https://doi.org/10.1101/765214
David Clewett
Department of Psychology, New York University, USA
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Camille Gasser
Department of Psychology, Columbia University, USA
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Lila Davachi
Department of Psychology, Columbia University, USANathan Kline Institute, Orangeburg, New York, USA
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  • For correspondence: ld24@columbia.edu
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Abstract

Everyday life unfolds continuously, yet we tend to remember past experiences as discrete event sequences or episodes. Although this phenomenon has been well documented, the brain mechanisms that support the transformation of continuous experience into memorable episodes remain unknown. Here we show that a sudden change in context, or ‘event boundary’, elicits a burst of autonomic arousal, as indexed by pupil dilation. These boundaries during dynamic experience also led to the segmentation of adjacent episodes in later memory, evidenced by changes in memory for the timing, order, and perceptual details of recent event sequences. Critically, we find that distinct cognitive components of this pupil response were associated with both subjective (temporal distance judgements) and objective (temporal order discrimination) measures of episodic memory, suggesting that multiple arousal-mediated cognitive processes help construct meaningful mnemonic events. Together, these findings reveal that arousal processes may play a fundamental role in everyday memory organization.

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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 September 11, 2019.
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Dynamic arousal signals construct memories of time and events
David Clewett, Camille Gasser, Lila Davachi
bioRxiv 765214; doi: https://doi.org/10.1101/765214
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Dynamic arousal signals construct memories of time and events
David Clewett, Camille Gasser, Lila Davachi
bioRxiv 765214; doi: https://doi.org/10.1101/765214

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