Functional dedifferentiation and reduced task-related deactivations underlie the age-related decline of prospective memory

Functional dedifferentiation and reduced task-related deactivations underlie the age-related... Prospective memory (PM) refers to the ability to remember to execute an intention at the appropriate moment in the future, which can be performed either at the appearance of an event (event-based, EBPM) or after a certain amount of time (time-based, TBPM). PM is generally impaired during aging but the cerebral substrates of this decline have been little investigated. Using functional Magnetic Resonance Imaging (fMRI), we investigated the neural bases of PM in 20 young and 20 healthy older adults. They were proposed a task of semantic categorisation of pictures (ongoing task). For some blocks, participants only had to perform this ongoing task while, for others, a PM instruction was added. In this case, a supplementary answer in response to a specific colour of border for EBPM or at specific time intervals for TBPM was expected. PM, and more particularly TBPM, declined in older adults. For both PM conditions, older adults recruited additional brain areas, but also showed reduced deactivations of other regions. These results are discussed in light of models of the aging brain. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Brain Imaging and Behavior Springer Journals

Functional dedifferentiation and reduced task-related deactivations underlie the age-related decline of prospective memory

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Publisher
Springer US
Copyright
Copyright © 2016 by Springer Science+Business Media New York
Subject
Biomedicine; Neurosciences; Neuroradiology; Neuropsychology; Psychiatry
ISSN
1931-7557
eISSN
1931-7565
D.O.I.
10.1007/s11682-016-9661-z
Publisher site
See Article on Publisher Site

Abstract

Prospective memory (PM) refers to the ability to remember to execute an intention at the appropriate moment in the future, which can be performed either at the appearance of an event (event-based, EBPM) or after a certain amount of time (time-based, TBPM). PM is generally impaired during aging but the cerebral substrates of this decline have been little investigated. Using functional Magnetic Resonance Imaging (fMRI), we investigated the neural bases of PM in 20 young and 20 healthy older adults. They were proposed a task of semantic categorisation of pictures (ongoing task). For some blocks, participants only had to perform this ongoing task while, for others, a PM instruction was added. In this case, a supplementary answer in response to a specific colour of border for EBPM or at specific time intervals for TBPM was expected. PM, and more particularly TBPM, declined in older adults. For both PM conditions, older adults recruited additional brain areas, but also showed reduced deactivations of other regions. These results are discussed in light of models of the aging brain.

Journal

Brain Imaging and BehaviorSpringer Journals

Published: Dec 6, 2016

References

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