Intraindividual variability may not always indicate vulnerability in elders' cognitive performance
Intraindividual variability may not always indicate vulnerability in elders' cognitive performance
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DOI：
10.1037/0882-7974.20.3.390
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Marsiske, M
中科院分区：
文献类型：
--
作者：
Allaire, JC;Marsiske, M
本研究考察了老年人在3项认知功能指标（归纳推理、记忆和感知速度）上的表现一致性或个体内变异性。理论推测表明，这种个体内的变异性可能是潜在的脆弱性或神经系统受损的信号。36名60岁及以上的参与者连续60天每天两次完成自我管理的认知评估。个体内变异在3个认知指标之间没有很强的相关性，但是，在研究过程中，个体内变异在一项任务中有很强的相关性。更高的平均性能的措施与更大的性能变异性，后续分析显示，更高水平的个体内变异正相关的幅度一个人的实践相关的增益在一个特定的措施。作者认为，随着时间的推移，适应性（与实践相关）和适应不良（与不一致性相关）的个体内变异可能存在于同一个体中。
This study examined consistency of performance, or intraindividual variability, in older adults' performance on 3 measures of cognitive functioning: inductive reasoning, memory, and perceptual speed. Theoretical speculation has suggested that such intraindividual variability may signal underlying vulnerability or neurologic compromise. Thirty-six participants aged 60 and older completed self-administered cognitive assessments twice a day for 60 consecutive days. Intraindividual variability was not strongly correlated among the 3 cognitive measures, but, over the course of the study, intraindividual variability was strongly intercorrelated within a task. Higher average performance on a measure was associated with greater performance variability, and follow-up analyses revealed that a higher level of intraindividual variability is positively associated with the magnitude of a person's practice-related gain on a particular measure. The authors argue that both adaptive (practice-related) and maladaptive (inconsistency-related) intraindividual variability may exist within the same individuals over time.