Longitudinal Relationships Between Subjective Cognitive Decline and Objective Memory: Depressive Symptoms Mediate Between-Person Associations.

Published on Jan 1, 2021in Journal of Alzheimer's Disease3.909
· DOI :10.3233/JAD-210230
Nikki L. Hill12
Estimated H-index: 12
(PSU: Pennsylvania State University),
Sakshi Bhargava5
Estimated H-index: 5
(PSU: Pennsylvania State University)
+ 3 AuthorsJacqueline Mogle21
Estimated H-index: 21
(PSU: Pennsylvania State University)
Background null Subjective cognitive decline (SCD) may be an early indicator of cognitive impairment, but depressive symptoms can confound this relationship. Associations may be influenced by differences between individuals (i.e., between-persons) or how each individual changes in their experiences over time (i.e., within-persons). null Objective null We examined depressive symptoms as a mediator of the between- and within-person associations of SCD and objective memory in older adults. null Methods null Coordinated analyses were conducted across four datasets drawn from large longitudinal studies. Samples (range: n = 1,889 to n = 15,841) included participants 65 years of age or older with no dementia at baseline. We used multilevel structural equation modeling to examine the mediation of SCD and objective memory through depressive symptoms, as well as direct relationships among SCD, objective memory, and depressive symptoms. null Results null Older adults who were more likely to report SCD had lower objective memory on average (between-person associations), and depressive symptoms partially mediated this relationship in three of four datasets. However, changes in depressive symptoms did not mediate the relationship between reports of SCD and declines in objective memory in three of four datasets (within-person associations). null Conclusion null Individual differences in depressive symptoms, and not changes in an individual's depressive symptoms over time, partially explain the link between SCD and objective memory. Older adults with SCD and depressive symptoms may be at greater risk for poor cognitive outcomes. Future research should explore how perceived changes in memory affect other aspects of psychological well-being, and how these relationships influence cognitive decline and Alzheimer's disease risk.
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