期刊
NEUROSCIENCE RESEARCH
卷 76, 期 3, 页码 156-162出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neures.2013.04.006
关键词
Near-infrared spectroscopy; Prefrontal cortex; Arithmetic task; Handgrip force variability; Divided attention; Dual-task
资金
- Languedoc-Roussillon Region council
- French University Institute
- National Agency for Research and Technology [1198/2009]
Functional near-infrared spectroscopy (fNIRS) is suitable for investigating cerebral oxygenation changes during motor and/or mental tasks. In the present study, we investigated how an additional mental load during a motor task at two submaximal loadings affects the fNIRS-measured brain activation over the right prefrontal cortex (PFC). Fifteen healthy males performed isometric grasping contractions at 15% and 30% of the maximal voluntary contraction (MVC) with or without an additional mental (i.e., arithmetic) task. Mental performance, force variability, fNIRS and subjective perception responses were measured in each condition. The performance of the mental task decreased significantly while the force variability increased significantly at 30% MVC as compared to 15% MVC, suggesting that performance of dual-task required more attentional resources. PFC activity increased significantly as the effort increased from 15% to 30% MVC (p < .001). Although a larger change in the deoxyhemoglobin was observed in dual-task conditions (p = .051), PFC activity did not change significantly as compared to the motor tasks alone. In summary, participants were unable to invest more attention and effort in performing the more difficult levels in order to maintain adequate mental performance. (c) 2013 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.
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