追踪作业中几种心理负荷评估指标敏感性的研究

A Study on Some Mental Workload Indexes for Tracking Performance

本研究在模拟追踪作业情境下 ,对主任务绩效测定、主观评定和若干生理测量在心理负荷评估中的敏感性进行了实验。实验采用重复测量的被试者内设计 ,2 0名被试 (男女各半 )在六档负荷下分别从事五分钟追踪作业。所选用的指标有追踪作业平均误差距离、追踪警告次数、主观负荷评定、心率、心率变异和血压。结果发现 :1主任务绩效在评估追踪作业心理负荷中具有最高的敏感性 ,主观评定次之 ,心率变化率和心率变异变化率也随负荷变化 ,血压指标随负荷变化的趋势不明显 ;2除血压指标外 ,其余各指标之间均存在明显的相关 ,这提示它们在评估追踪作业心理负荷中具有较大的可靠性。

This study evaluated the sensitivity of primary task performance, subjective rating and some physiological indexes in assessing tracking mental workload. Twenty subjects ( 10 males and 10 females ) joined the experiment, and each subject was required to take a 5 minutes tracking task under six workload levels. Tracking error, warning number, subjective rating, heart rate, heart rate variance and blood pressure were recorded. Two results found in the experiment were: 1) Primary task performance had the highest sensitivity in assessing tracking mental workload, subjective rating was the next, then followed by the heart rate and heart rate variance, the blood pressure was the last. 2) All indexes but blood pressure were significantly correlated with each other.