双任务脑力负荷评定的多变量判别分析

为探讨判别分析技术在双任务脑力负荷评定中的意义，在完成由视觉追踪主任务和听觉Ｏｄｄｂａｌ附任务组成的双任务的过程中，同步记录了被试者多种心理生理指标。对资料分析的结果表明：追踪误差、脑事件相关电位Ｐ３波潜时和逐次心跳间期与脑力负荷关系较为密切，用多变量判别分析可以成功区分出被试者所处的脑力负荷状态，较单变量判别分析的判别正确率高。提示：多变量判别分析在脑力负荷评定中有一定意义。

Multivariate Discriminant Analysis for Assessing Mental Workload During Dual Task Operation.

In order to investigate the efficiency of multivariate discriminant analysis in the assessment of mental workload during dual task operations,various psychophysiological indices and performance were recorded.The dual task consisted of the primary visual tracking task and the secondary Oddball task.The results indicated that tracking error,latency of P3 and IBI of HR correlated well with the mental workload and the multivariate discriminant analysis succeeded in classifying the levels of mental workload with higher conformation rate than those using the singal index.It suggests that multivariate discriminant analysis is meaningful in the assessment of mental workload under dual task situations.