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基于脑电图的不同信息类型工作记忆任务中脑力负荷的评估

[Evaluation of Mental Workload in Working Memory Tasks with Different Information Types Based on EEG].

作者信息

Guan Kai, Wang Sheng, Zhang Zhimin, Liu Tao, Niu Haijun

机构信息

School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083.

Shanghai Aviation Electric Co. Ltd., Shanghai, 201101.

出版信息

Zhongguo Yi Liao Qi Xie Za Zhi. 2022 Jan 30;46(1):10-15. doi: 10.3969/j.issn.1671-7104.2022.01.003.

Abstract

OBJECTIVE

Exploring the effectiveness of using EEG linear and nonlinear features for accessing mental workload in different tasks.

METHODS

Working memory tasks with different information types and various mental loads were designed based on N-Back paradigm. EEG signals from 18 normal adults were acquired when tasks were being performed. Linear and nonlinear features of EEGs were then extracted. Indices that can effectively reflect mental workload levels were selected by using multivariate analysis of variance statistical approach.

RESULTS

With the increment of task load, power of frontal Theta, Theta/Alpha ratio, and sample entropies (scales>10) in parietal regions increased significantly first and decreased slightly then, while the power of central-parietal Alpha decreased significantly first and increased slightly then. No difference in power of frontal Theta, central-parietal Alpha, and sample entropies (scales>10) of parietal regions were found between verbal and object tasks, as well as between two spatial tasks. No difference of frontal Theta/Alpha ratio was found in all the four tasks.

CONCLUSIONS

The results can provide evidence for the mental workload evaluation in tasks with different information types.

摘要

目的

探究利用脑电图的线性和非线性特征评估不同任务中脑力负荷的有效性。

方法

基于N-回溯范式设计了具有不同信息类型和多种脑力负荷的工作记忆任务。在执行任务时采集了18名正常成年人的脑电图信号。然后提取脑电图的线性和非线性特征。采用方差分析统计方法选择能够有效反映脑力负荷水平的指标。

结果

随着任务负荷的增加,额叶θ波功率、θ/α比值以及顶叶区域的样本熵(尺度>10)先显著增加,随后略有下降,而中央-顶叶α波功率先显著下降,随后略有增加。在言语任务和物体任务之间以及两个空间任务之间,额叶θ波功率、中央-顶叶α波功率和顶叶区域的样本熵(尺度>10)均未发现差异。在所有四项任务中,额叶θ/α比值均未发现差异。

结论

研究结果可为不同信息类型任务中的脑力负荷评估提供依据。

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