Measurement Invariance of the Nasa TLX
Measurement Invariance of the Nasa TLX
复制标题
Nasa TLX 的测量不变性
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Randall D. Spain
中科院分区：
文献类型：
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作者：
E. A. Bustamante;Randall D. Spain
心理负荷是人因研究人员最感兴趣的构念之一。充分评估人们在特定条件下执行任务时所经历的精神工作量对于设计安全和高效的系统至关重要。由于其易于使用，NASA TLX已成为最广泛使用的测量脑力工作量的方法。然而，其心理测量特性仍有疑问。本研究的目的是检验TLX测量不变性的程度，并提高人为因素界的认识。200名参与者报告了他们在城市、农村和全国各地开车时通常经历的精神工作量。结果表明，TLX缺乏标量不变性，从而使平均分数的估计偏倚，使平均差异的检验具有误导性。这些发现表明，在推断不同条件下参与者报告的心理工作量的平均差异之前，研究人员应该首先检查TLX的测量不变性的程度。
Mental workload is one of the most important constructs of interests for Human Factors researchers. Adequately assessing the amount of mental workload that people experience while performing tasks under specific conditions is essential for the design of safe and efficient systems. Due to its ease of use, the NASA TLX has become the most widely used method of measuring mental workload. However, its psychometric properties are still questionable. The purpose of this study was to examine the extent of measurement invariance of the TLX and raise awareness in the Human Factors community. Two hundred participants reported the amount of mental workload they typically experience while driving in urban and rural areas and across the country. Results indicated that the TLX lacked scalar invariance, thereby biasing the estimation of mean scores and making the examination of mean differences misleading. These findings suggest that researchers should first examine the extent of measurement invariance of the TLX before they proceed to make inferences about mean differences in the amount of mental workload reported by participants under different conditions.