The sensitivity of dual-task performance to cognitive status in aging
The sensitivity of dual-task performance to cognitive status in aging
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DOI：
10.1017/s1355617704102099
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发表时间：
2004-03-01
影响因子：
2.6
通讯作者：
Donovick, PJ
中科院分区：
文献类型：
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作者：
Holtzer, R;Burright, RG;Donovick, PJ
本研究考察了认知障碍老年人和正常对照组的双任务表现。参与者（N = 60； M年龄= 84.6）从居住设施和社区招募。他们被分为三组：(1)认知障碍组；(2)居住设施控制；(3)社区控制。两种不同的双任务条件由简单的测试组成，这些测试可能是通过不同的感知模式处理的：一个是视觉-手动，一个是听觉-语言。第一个条件包括视觉消除测试和听觉数字跨度测试。第二个条件包括另一种形式的视觉消除测试和字母流畅性。NIANOVA检验了认知状态（三水平自变量）对双任务表现3个指标（字母流畅性、数字广度、视觉消去）的影响。分析控制了年龄、教育程度和单独进行每次测试时的表现。结果显示，与两个对照组相比，认知障碍组的双任务成本明显更高。此外，从判别功能分析中可以明显看出，双任务测量在区分认知障碍老年人和正常对照组方面非常准确，而且比传统的神经心理学测量更好。
The present study examined dual-task performance in elders with cognitive impairments and normal controls. The participants (N = 60; M age = 84.6) were recruited from residential facilities and the community. They were assigned to one of three groups: (1) cognitive impairment; (2) residential facility control; (3) community control. Two different dual-task conditions were comprised of simple tests that are presumably processed via separate perceptual modalities: 1 visual-manual and 1 auditory-verbal. The first condition consisted of a visual cancellation test and an auditory digit span. The second condition was comprised of an alternate form of the visual cancellation test and letter fluency. NIANOVA examined the effect of cognitive status (3-level independent variable) on 3 indices of dual-task performance (letter fluency, digit span, visual cancellation). Analyses controlled for age, education and performance on each test when performed alone. The results revealed that the cognitive impairment group incurred significantly greater dual-task costs compared to both control groups. Furthermore, as was evident from discriminant function analyses, the dual-task measures were very accurate and better than the traditional neuropsychological measures at discriminating elders with cognitive impairments from normal controls.