This is a revision of a renewal application for a project known as the Victoria Longitudinal Study (VLS). A prospective study underway for over 20 years, the VLS has operated effectively and productively for the last decade in two coordinated labs. The general objective of the VLS is to examine actual short- and long-term changes in middle-aged and older adults across many domains of cognition as they are dynamically influenced and modified by multiple aspects of health (e.g., conditions, beliefs), biological attributes (e.g., functional, genetic), lifestyle activities (e.g., cognitive, social, physical engagement), and neuropsychological status (e.g., cognitively successful, normal, cognitively impaired). According to our Research Plan, we collect systematic, multivariate, and comprehensive data on long-term volunteer participants through repeated waves of observation at regular intervals (every 3-4 years, with 10-12 hours of testing at each wave). Since its inception, the VLS follows a design that features three initially healthy sequential samples (all initially aged 55-85 years, now about 63-100+ years). The three samples were begun in adjacent decades (1980s, 1990s, and 2000s). The VLS now has longitudinal data that span a gradient of 40 years of aging, plus numerous control (e.g., younger, middle-aged adults) and emerging target and comparison groups (e.g., Type 2 diabetes, Mild Cognitive Impairment). The current Specific Aims are to (a) continue the systematic assembly of a rich data archive on actual cognitive changes with aging, (b) identify key patterns of cognitive differences, changes, and transitions with aging, and (c) investigate theoretically and clinically relevant precursors, correlates, and modifiers of healthy, normal, and impaired changes with aging. We report substantial progress in pursuing these aims in the recent grant period. Our Proposed Research includes (a) continued collection of critical waves of longitudinal data, (b) development and management of all longitudinal and comparison samples, and (c) new research in four integrative themes of contemporary cognitive aging. Each proposed theme involves innovative studies on (a) independent and interacting influences (e.g., health, lifestyle, genetic, functional across (b) multiple domains of reliably measured cognitive change (e.g., declarative memory, executive function, speed and inconsistency) using (c) well-characterized and large samples of broad age-bands of adults who may be (d) representative of theoretically and clinically interesting health groups of significance to aging, and are always (e) followed carefully across longitudinal waves. The General Significance of the VLS lies in its ever-growing rich, unique, and multi-faceted data set on actual changes in human aging. A more specific significance pertains to the increasingly integrative studies showing both independent and interactive influences on cognitive aging trajectories and outcomes. The research we conduct addresses historically valid and currently compelling empirical, theoretical, and practical issues of health and aging.
Our longitudinal study has adopted an approach to the study of human cognitive aging that involves several integrated features. Our perspective involves studying (a) actual aging with change-sensitive designs and analyses, (b) multiple cognitive processes followed over short- and long-term periods, and (c) independent, interacting, and emerging influences and outcomes from health, biological, environmental, lifestyle, and neuropsychological domains. Our studies provide new theoretical and applied information on healthy, normal, and impaired cognitive aging.
|McFall, G Peggy; Wiebe, Sandra A; Vergote, David et al. (2015) ApoE and pulse pressure interactively influence level and change in the aging of episodic memory: Protective effects among ?2 carriers. Neuropsychology 29:388-401|
|Sapkota, Shraddha; Vergote, David; Westaway, David et al. (2015) Synergistic associations of catechol-O-methyltransferase and brain-derived neurotrophic factor with executive function in aging are selective and modified by apolipoprotein E. Neurobiol Aging 36:249-56|
|Dixon, Roger A; de Frias, Cindy M (2014) Cognitively elite, cognitively normal, and cognitively impaired aging: neurocognitive status and stability moderate memory performance. J Clin Exp Neuropsychol 36:418-30|
|Runge, Shannon K; Small, Brent J; McFall, G Peggy et al. (2014) APOE moderates the association between lifestyle activities and cognitive performance: evidence of genetic plasticity in aging. J Int Neuropsychol Soc 20:478-86|
|van Ginkel, Joost R; Kroonenberg, Pieter M (2014) Analysis of Variance of Multiply Imputed Data. Multivariate Behav Res 49:78-91|
|DeCarlo, Correne A; Tuokko, Holly A; Williams, Dorothy et al. (2014) BioAge: toward a multi-determined, mechanistic account of cognitive aging. Ageing Res Rev 18:95-105|
|de Frias, Cindy M; Dixon, Roger A (2014) Lifestyle engagement affects cognitive status differences and trajectories on executive functions in older adults. Arch Clin Neuropsychol 29:16-25|
|McFall, G Peggy; Wiebe, Sandra A; Vergote, David et al. (2014) IDE (rs6583817) polymorphism and pulse pressure are independently and interactively associated with level and change in executive function in older adults. Psychol Aging 29:418-30|
|Dolcos, Sanda; Katsumi, Yuta; Dixon, Roger A (2014) The role of arousal in the spontaneous regulation of emotions in healthy aging: a fMRI investigation. Front Psychol 5:681|
|Dixon, Roger A; de Frias, Cindy M (2007) Mild memory deficits differentially affect 6-year changes in compensatory strategy use. Psychol Aging 22:632-8|
Showing the most recent 10 out of 29 publications