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Pupil dilation during recognition memory: isolating unexpected recognition from judgment uncertainty

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Author(s)

Ravi Dev Mill, Akira Robert O'Connor, Ian Dobbins

School/Research organisations

Abstract

Optimally discriminating familiar from novel stimuli demands a decision-making process informed by prior expectations. Here we demonstrate that pupillary dilation (PD) responses during recognition memory decisions are modulated by expectations, and more specifically, that pupil dilation increases for unexpected compared to expected recognition. Furthermore, multi-level modeling demonstrated that the time course of the dilation during each individual trial contains separable early and late dilation components, with the early amplitude capturing unexpected recognition, and the later trailing slope reflecting general judgment uncertainty or effort. This is the first demonstration that the early dilation response during recognition is dependent upon observer expectations and that separate recognition expectation and judgment uncertainty components are present in the dilation time course of every trial. The findings provide novel insights into adaptive memory-linked orienting mechanisms as well as the general cognitive underpinnings of the pupillary index of autonomic nervous system activity.
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Details

Original languageEnglish
Pages (from-to)81-94
JournalCognition
Volume154
Early online date30 May 2016
DOIs
Publication statusPublished - Sep 2016

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