EEG功率信息显示特征对认知负荷的影响

为解决防空反导指控舱人机界面"巨量信息,有限显示"的矛盾,通过试验探究信息显示率、信息提供率、数据更新率对指控舱界面认知负荷的影响。建立以脑电信号(EEG)α波的频谱功率及任务负荷指数(TLX)量表为评价指标的主、客观认知负荷综合评价模型,并用此模型评估认知负荷。结果表明:3个因素对认知负荷影响极其显著,影响从大到小排序为信息显示率、信息提供率、数据更新率;使认知负荷最小的因素组合为信息显示率80 bit、信息提供率4 bit、数据更新率3 s。

Influence of display characteristics of EEG power on cognitive load

In order to solve contradiction between " massive information and limited display" of humancomputer interface in air and missile defense control cabin, influence of information display ratio,information delivery ratio and data update ratio on cognitive load of interface was explored through experiments. A comprehensive evaluation model of subjective and objective cognitive load was established with spectral power of EGG alpha wave and task load index(TLX) scale as indicators,and was used to evaluate cognitive load. The results show that these three factors have a significant impact on cognitive load in an order of information display ratio,information delivery ratio,and data update ratio decreasingly according to their influence degree. The combination that that minimizes cognitive load is formed with an information display ratio of 80 bits,an information delivery ratio of 4 bits,and an data update ratio of 3 s.