Effects of instructed focus and task difficulty on concurrent walking and cognitive task performance in healthy young adults.
Effects of instructed focus and task difficulty on concurrent walking and cognitive task performance in healthy young adults.
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DOI：
10.1007/s00221-010-2429-6
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发表时间：
2010-11
影响因子：
2
通讯作者：
Shumway-Cook, Anne
中科院分区：
文献类型：
--
作者：
Kelly, Valerie E.;Janke, Alexis A.;Shumway-Cook, Anne
双任务范式可以用来研究认知与姿势和步态控制之间的相互作用。然而，测量和解释双重任务绩效的变化是具有挑战性的，因为许多因素都会影响绩效。本研究探讨了指导的重点和步行任务的难度，以及这些因素之间的相互作用，对双重任务的表现在健康的年轻人。15名参与者进行了认知任务，同时步行与一个通常的基础或狭窄的基础的支持。参与者被指示专注于认知任务或步行。使用修改后的注意力分配指数和性能操作特性的权衡任务内和任务之间进行了评估。指示焦点影响认知任务和步行。认知任务的表现更快的指令专注于认知任务，步行更快（在窄基条件下更准确）的指令专注于步行。行走任务难度不影响认知能力，但确实影响行走，在通常基础与窄基础条件下行走更快。有证据表明，相互作用，更大的影响，指导重点的认知任务，在平时与窄基步行。这些结果支持的想法，灵活地转移注意力分配和任务性能的指示取决于姿势控制任务的难度。修改后的注意力分配指数和性能操作特性是有用的，在充分表征任务之间和任务内的权衡，以了解双任务性能的变化。更清楚地了解影响双任务行走的因素以及这些因素之间的相互作用对临床和研究环境中双任务性能的评估具有重要意义。
Dual task paradigms can be used to examine the interactions between cognition and the control of posture and gait. Measuring and interpreting changes in dual task performance is challenging, however, because many factors can influence performance. This study examined the effects of instructed focus and walking task difficulty, and the interaction between these factors, on dual task performance in healthy young adults. Fifteen participants performed a cognitive task while walking with either a usual base or a narrow base of support. Participants were instructed to focus on either the cognitive task or walking. Trade-offs both within and between tasks were assessed using the modified attention allocation index and the performance operating characteristic. Instructed focus influenced both the cognitive task and walking. Performance on the cognitive task was faster with instructions to focus on the cognitive task, and walking was faster (and more accurate in the narrow-base condition) with instructions to focus on walking. Walking task difficulty did not affect cognitive performance but did affect walking, with faster walking in the usual-base versus narrow-base condition. There was evidence of an interaction, with greater effects of instructed focus on the cognitive task during usual versus narrow-base walking. These results support the idea that the ability to flexibly shift attention allocation and task performance in response to instructions depends on the difficulty of the postural control task. The modified attention allocation index and the performance operating characteristic were instrumental in fully characterizing trade-offs between and within tasks in order to understand dual task performance changes. A clearer understanding of the factors that affect dual task walking and the interactions between these factors has important implications for the assessment of dual task performance in both clinical and research settings.
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DOI：
10.1037/0096-1523.11.5.617
发表时间：
1985-01-01
影响因子：
2.1
作者：
KERR, B;CONDON, SM;MCDONALD, LA
通讯作者：
MCDONALD, LA
影响因子：
2.5
作者：
MORGAN, ALR;BRANDT, JF
通讯作者：
BRANDT, JF
DOI：
10.1093/gerona/63.12.1364
发表时间：
2008-12-01
影响因子：
5.1
作者：
Siu, Ka-Chun;Chou, Li-Shan;Woollacott, Marjorie H.
通讯作者：
Woollacott, Marjorie H.
影响因子：
1.8
作者：
Lajoie, Y;Teasdale, N;Fleury, M
通讯作者：
Fleury, M
DOI：
10.1093/gerona/54.4.m165
发表时间：
1999-04-01
影响因子：
5.1
作者：
Brown, LA;Shumway-Cook, A;Woollacott, MH
通讯作者：
Woollacott, MH