Journal article
Mediating effects of processing speed and executive functions in age-related differences in episodic memory performance: A cross-validation study
T Lee, JD Crawford, JD Henry, JN Trollor, NA Kochan, MJ Wright, D Ames, H Brodaty, PS Sachdev
Neuropsychology | AMER PSYCHOLOGICAL ASSOC | Published : 2012
DOI: 10.1037/a0030053
Abstract
Objective: Age differences in episodic memory (memory) have been attributed to a general reduction in processing speed (the "speed mediation hypothesis"), but also to declines in the efficiency of executive functions operations ("executive decline hypothesis"). To test predictions from these competing models, we examined the mediating effects of processing speed (speed) and executive functions (executive) on age and episodic memory in three older adult cohorts. Method: The first sample comprised 842 individuals from the Sydney Memory and Aging Study (MAS). The second and third samples included 476 individuals from the Older Australian Twins Study (OATS), with each twin from a pair randomly a..
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Awarded by National Health and Medical Research Council of Australia Program Grant
Awarded by National Health and Medical Research Council of Australia/Australian Research Council Strategic Award Grant of the Ageing Well, Ageing Productively Program
Awarded by National Health and Medical Research Council
Funding Acknowledgements
The Sydney Memory and Ageing Study is supported by the National Health and Medical Research Council of Australia Program Grant (ID 350833). The Older Australian Twins Study is supported by the National Health and Medical Research Council of Australia/Australian Research Council Strategic Award Grant of the Ageing Well, Ageing Productively Program (ID No. 401126), and facilitated with access to the Australian Twin Registry, a national research resource supported by an Enabling Grant (ID 310667) from the National Health and Medical Research Council, and administered by The University of Melbourne. We thank the Sydney MAS and the OATS research teams (www.brainage.med.unsw.edu.au) for their contributions to this study. We also thank the participants of both studies.