Processing speed and longitudinal trajectories of change for cognitive abilities: The Swedish Adoption/Twin Study of Aging

被引:148
作者
Finkel, D
Pedersen, NL
机构
[1] Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden
[2] Indiana Univ SE, Sch Social Sci, New Albany, IN 47150 USA
[3] Univ So Calif, Dept Psychol, Los Angeles, CA 90089 USA
关键词
D O I
10.1080/13825580490511152
中图分类号
B844 [发展心理学(人类心理学)];
学科分类号
040202 ;
摘要
In this manuscript, The Swedish Adoption/Twin Study of Aging (SATSA) is described. Although the study is a multidisciplinary program in gerontological genetics, the summary of findings focuses on the cognitive measures. In the second part of the manuscript, we investigate the role played by measures of processing speed in explaining the longitudinal trajectories of change for cognitive abilities and the genetic and environmental influences on those trajectories. When processing speed was regressed out of cognitive measures representing three cognitive domains (crystallized, fluid, and memory) and a general cognitive factor, the trajectory of decline was less severe. Quantitative genetic analyses indicated that environmental variance increases in late adulthood. A substantial portion of the genetic variance for these cognitive abilities was accounted for by genetic variance for speed. With increasing age, genetic variance associated with processing speed becomes a more prominent component of genetic variance for fluid abilities and for the general cognitive factor.
引用
收藏
页码:325 / 345
页数:21
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