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Neurocognitive systems related to real-world prospective memory.
Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
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2010 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 5, no 10, e13304- p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Prospective memory (PM) denotes the ability to remember to perform actions in the future. It has been argued that standard laboratory paradigms fail to capture core aspects of PM.

METHODOLOGY/PRINCIPAL FINDINGS: We combined functional MRI, virtual reality, eye-tracking and verbal reports to explore the dynamic allocation of neurocognitive processes during a naturalistic PM task where individuals performed errands in a realistic model of their residential town. Based on eye movement data and verbal reports, we modeled PM as an iterative loop of five sustained and transient phases: intention maintenance before target detection (TD), TD, intention maintenance after TD, action, and switching, the latter representing the activation of a new intention in mind. The fMRI analyses revealed continuous engagement of a top-down fronto-parietal network throughout the entire task, likely subserving goal maintenance in mind. In addition, a shift was observed from a perceptual (occipital) system while searching for places to go, to a mnemonic (temporo-parietal, fronto-hippocampal) system for remembering what actions to perform after TD. Updating of the top-down fronto-parietal network occurred at both TD and switching, the latter likely also being characterized by frontopolar activity.

CONCLUSION/SIGNIFICANCE: Taken together, these findings show how brain systems complementary interact during real-world PM, and support a more complete model of PM that can be applied to naturalistic PM tasks and that we named PROspective MEmory DYnamic (PROMEDY) model because of its dynamics on both multi-phase iteration and the interactions of distinct neurocognitive networks.

Place, publisher, year, edition, pages
San Francisco: Public library of Science , 2010. Vol. 5, no 10, e13304- p.
National Category
Psychology Radiology, Nuclear Medicine and Medical Imaging
URN: urn:nbn:se:su:diva-85135DOI: 10.1371/journal.pone.0013304PubMedID: 20949046OAI: diva2:585446
Available from: 2013-01-10 Created: 2013-01-07 Last updated: 2014-11-24Bibliographically approved

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