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The eye of the retriever: Developing episodic memory mechanisms in preverbal infants assessed through pupil dilation
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.ORCID iD: 0000-0003-4671-7181
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.ORCID iD: 0000-0003-3046-0043
2018 (English)In: Developmental Science, ISSN 1363-755X, E-ISSN 1467-7687, Vol. 21, no 2, article id e12520Article in journal (Refereed) Published
Abstract [en]

Studying memory in infants can be challenging, as they cannot express their subjective recollection verbally. In this study we use a novel method with which we can assess episodic recognition memory through pupillometry, using identical procedures and stimuli for infants and adults. In three experiments of 4- and 7-month-old infants, and adults we show that the adult pupillary response is larger to previously seen than to never seen items (old/new effect). Pupil dilations index subjective memory experience in adults, producing distinct pupil dilations to items judged as remembered, familiar, and new, regardless of actual previous exposure (Experiment 1). Seven-month-old infants demonstrate a clear pupillary old/new effect, very similar to that of adults (Experiment 2), whereas 4-month-olds do not demonstrate such an effect (Experiment 3). Our findings suggest that the mnemonic mechanisms that serve infants' and adults' episodic recognition memory are more similar than previously asserted: they are not fully developed at 4 months of age but that there is contiguity in human episodic memory development from 7 months of age.

Place, publisher, year, edition, pages
2018. Vol. 21, no 2, article id e12520
National Category
Psychology
Identifiers
URN: urn:nbn:se:uu:diva-309034DOI: 10.1111/desc.12520ISI: 000427006200003PubMedID: 27981704OAI: oai:DiVA.org:uu-309034DiVA, id: diva2:1051376
Funder
Knut and Alice Wallenberg Foundation
Available from: 2016-12-01 Created: 2016-12-01 Last updated: 2018-05-09Bibliographically approved

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Hellmer, KahlSöderlund, HedvigGredebäck, Gustaf

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