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Aging, Neuropsychology, and Cognition
A Journal on Normal and Dysfunctional Development
Volume 28, 2021 - Issue 6
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Original Article

Actigraphy-recorded sleep efficiency and hippocampal volume are related to visual and verbal rate of forgetting in older adults

Alessandra Leea School of Psychology, The University of Sydney, Camperdown, NSW, Australia;b Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia
,
Suncica Laha School of Psychology, The University of Sydney, Camperdown, NSW, AustraliaORCID Iconhttps://orcid.org/0000-0003-2282-4812
ORCID Icon,
Samantha Joplina School of Psychology, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia
,
Carla Haroutoniana School of Psychology, The University of Sydney, Camperdown, NSW, Australia;b Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia;e Neurosleep, Australian National Health and Medical Research Council Centre of Research Excellence, Sydney, Australia
,
Jonathon Pyea School of Psychology, The University of Sydney, Camperdown, NSW, Australia;b Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia
,
Loren Mowszowskia School of Psychology, The University of Sydney, Camperdown, NSW, Australia;b Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia;e Neurosleep, Australian National Health and Medical Research Council Centre of Research Excellence, Sydney, AustraliaORCID Iconhttps://orcid.org/0000-0002-7534-5017
ORCID Icon,
Shantel L. Duffyb Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia;e Neurosleep, Australian National Health and Medical Research Council Centre of Research Excellence, Sydney, AustraliaORCID Iconhttps://orcid.org/0000-0001-9586-4730
ORCID Icon &
Sharon L. Naismitha School of Psychology, The University of Sydney, Camperdown, NSW, Australia;b Healthy Brain Ageing Program, Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;c Brain and Mind Centre, The University of Sydney, Camperdown, NSW, Australia;d Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia;e Neurosleep, Australian National Health and Medical Research Council Centre of Research Excellence, Sydney, AustraliaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0001-9076-2778
ORCID Icon show all
Pages 936-958 | Received 18 Mar 2020, Accepted 23 Oct 2020, Published online: 03 Nov 2020
 
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ABSTRACT

This study aimed to determine if older adults “at-risk” for dementia (those with MCI or SMC) exhibit accelerated long-term forgetting (ALF) and whether rate of forgetting (RoF) is associated with sleep efficiency, hippocampal volume and demographic/clinical features. Forty-nine “at-risk” participants and eighteen controls underwent examination. Memory was assessed using the Scene Memory Task (SMT) and WMS-III Logical Memory (LM) subtest. Tests were administered at baseline, 24 hours and 2 weeks. While our study did not find ALF in those “at-risk” for dementia, on the SMT, RoF over 24 hours and 2 weeks was negatively correlated with sleep efficiency. For LM, RoF at 2 weeks was moderately associated with left hippocampal volume. Neither visual or verbal RoF was correlated with demographic or clinical variables (age, MMSE, IQ, GDS-15). While ALF was not observed in this sample, our results suggest that visual and verbal forgetting have differential predictors.

Acknowledgments

The authors are grateful for the participants of the Healthy Brain Ageing Program, who generously donated their time to participate in this research. Prof Naismith is supported by an NHMRC Boosting Dementia Leadership Fellowship. Drs Duffy and Mowszowski are supported by NHMRC-ARC Dementia Research Development Fellowships. There were no sources of financial support for this study.

Disclosure statement

No potential conflict of interest was reported by the authors.

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