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Change in intraindividual variability over time as a key metric for defining performance-based cognitive fatigability

机译：个体差异随时间的变化是定义基于表现的认知疲劳性的关键指标

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摘要

Cognitive fatigability is conventionally quantified as the increase over time in either mean reaction time (RT) or error rate from two or more time periods during sustained performance of a prolonged cognitive task. There is evidence indicating that these mean performance measures may not sufficiently reflect the response characteristics of cognitive fatigue. We hypothesized that changes in intraindividual variability over time would be a more sensitive and ecologically meaningful metric for investigations of fatigability of cognitive performance. To test the hypothesis fifteen young adults were recruited. Trait fatigue perceptions in various domains were assessed with the Multidimensional Fatigue Index (MFI). Behavioral data were then recorded during performance of a three-hour continuous cued Stroop task. Results showed that intraindividual variability, as quantified by the coefficient of variation of RT, increased linearly over the course of three hours and demonstrated a significantly greater effect size than mean RT or accuracy. Change in intraindividual RT variability over time was significantly correlated with relevant subscores of the MFI including reduced activity, reduced motivation and mental fatigue. While change in mean RT over time was also correlated with reduced motivation and mental fatigue, these correlations were significantly smaller than those associated with intraindividual RT variability. RT distribution analysis using an ex-Gaussian model further revealed that change in intraindividual variability over time reflects an increase in the exponential component of variance and may reflect attentional lapses or other breakdowns in cognitive control. These results suggest that intraindividual variability and its change over time provide important metrics for measuring cognitive fatigability and may prove useful for inferring the underlying neuronal mechanisms of both perceptions of fatigue and objective changes in performance.
机译：认知疲劳性通常被量化为在持续执行长期认知任务过程中，两个或多个时间段的平均反应时间（RT）或错误率随时间的增长。有证据表明，这些平均绩效指标可能不足以反映认知疲劳的反应特征。我们假设，随着时间的推移，个体内变异性的变化将是一种更敏感和具有生态意义的指标，可用于研究认知表现的可疲劳性。为了检验假设，招募了十五名年轻人。使用多维疲劳指数（MFI）评估了各个领域的特质疲劳感。然后在执行为时三个小时的连续提示Stroop任务期间记录行为数据。结果表明，通过RT变异系数量化的个体内变异性在三个小时的过程中呈线性增加，并且显示出比平均RT或准确性明显更大的效应大小。个体内RT变异性随时间的变化与MFI的相关评分密切相关，包括活动减少，动机减少和精神疲劳。虽然平均RT随时间的变化也与动机减少和精神疲劳相关，但这些相关性显着小于与个体内RT变异性相关的相关性。使用前高斯模型的RT分布分析进一步揭示，个体内变异性随时间的变化反映出方差的指数成分增加，并且可能反映出注意力下降或认知控制中的其他崩溃。这些结果表明，个体内部的变异性及其随时间的变化为衡量认知疲劳性提供了重要的指标，并且可能被证明有助于推断潜在的神经元机制，既可以感知疲劳感，也可以表现出客观的变化。

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  • 来源
    《Brain and cognition》 |2014年第3期|251-258|共8页
  • 作者

    Chao Wang; Mingzhou Ding; Benzi M. Kluger;

  • 作者单位

    J Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States;

    J Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States;

    Department of Neurology, University of Colo-rado Denver, Mail Stop B-185,12631 East 17th Avenue, Aurora, CO 80045, United States;

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  • 正文语种 eng
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  • 关键词

    Fatigability; Stroop; Fatigue; Intraindividual variability; Cognition;

    机译：易疲劳性Stroop;疲劳;个体差异认识;

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