|Title:||Neuronal Responses to a Postural Dual-Task With Differential Attentional Prioritizations: Compensatory Resource Allocation With Healthy Aging||Authors:||Yu, Shu Han
Hwang, Ing Shiou
|Keywords:||Attention | Event-related potential | Falls and mobility problems | Neuroscience||Issue Date:||4-Oct-2019||Journal Volume:||74||Journal Issue:||8||Source:||The journals of gerontology. Series B, Psychological sciences and social sciences||Abstract:||
© The Author(s) 2018. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: email@example.com. OBJECTIVES: Restricted central processing in older adults prevents optimization of a dual task with a flexible prioritization strategy. This study investigated the neural mechanisms of task-priority in young and older adults when performing a posture-motor dual-task. METHOD: Sixteen healthy young and 16 older adults performed a force-matching task on a mobile-platform under posture-focus (PF) and supraposture-focus (SF) conditions. The platform movement, force-matching performance, and event-related potentials in the preparatory period were recorded. RESULTS: For the elders, the postural stability and force-matching accuracy using the PF strategy were inferior to those using the SF strategy; whereas, the dual-task performances of the young adults were less affected by the prioritization. Only the elders exhibited the P1 wave, with the PF strategy associated with a smaller P1 and larger P1 than the SF strategy in the sensorimotor-parietal and right frontotemporal areas, respectively. The PF strategy also led to a larger P2 wave in the right frontotemporal area of elders, but a greater P2 wave in the sensorimotor-parietal area of young adults. DISCUSSION: For both prioritization strategies, older adults entailed a longer preparatory process than younger adults. Dual-task performance of older adults was more vulnerable to PF strategy, underlying compensatory resource allocation in the preparatory period for resolution of dual-task interference due to degenerated frontal function.
|Appears in Collections:||物理治療學系所|
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