期刊
NEUROSCIENCE
卷 348, 期 -, 页码 143-152出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2017.02.014
关键词
balance; EEG; preparation; dual-task
资金
- Natural Sciences and Engineering Council of Canada
- Heart and Stroke Foundation Canadian Partnership for Stroke Recovery
- Toronto Rehabilitation Institute
- Canada Foundation for Innovation
- Ontario Innovation Trust
- Ministry of Research and Innovation
Preparation for postural instability engages cortical resources that serve to optimize compensatory balance responses. Engagement of these cortical resources in cognitive dual-task activities may impact the ability to appropriately prepare and optimize responses to instability. The purpose of this study was to determine whether cognitive dual-task activities influenced cortical activity preceding and following postural instability. Postural instability was induced using a lean-and-release paradigm in 10 healthy participants. Perturbations were either temporally predictable (PRED) or unpredictable (UNPRED) and presented with (COG) or without a cognitive dual-task, presented in blocks of trials. The electroencephalogram was recorded from multiple frontal electrode sites. EEG data were averaged over 25-35 trials across conditions. Area under the curve of pre-perturbation cortical activity and peak latency and amplitude of post-perturbation cortical activity were quantified at the Cz site and compared across conditions. Performance of the concurrent cognitive task reduced the mean (SE) magnitude of pre-perturbation cortical activity in advance of predictable bouts of postural instability (PRED: 18.7(3.0) mV ms; PRED-COG; 14.0(2.3) mV ms). While the level of cognitive load influenced the amplitude of the post-perturbation N1 potential in the predictable conditions, there were no changes in N1 with a cognitive dual task during unpredictable conditions (PRED: -32.1(3.2) mu V; PRED-COG: -50.8(8.4) mu V; UNPRED: -65.0(12.2) mu V; UNPRED-COG: -64.2(12.7) mu V). Performance of the cogni-tive task delayed and reduced the magnitude of the initial gastrocnemius response. The findings indicate that pre- and post-perturbation cortical activity is affected by a cognitive distractor when postural instability is temporally predictable. Distraction also influences associated muscle responses. (C) 2017 IBRO. Published by Elsevier Ltd. All rights reserved.
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