Galy Edith, Paxion Julie, Berthelon Catherine
a LAPCOS , University Côte d'Azur , Nice , France.
b ACSO , French Armed Forces Biomedical Research Institute , Brétigny-sur-Orge , France.
Ergonomics. 2018 Apr;61(4):517-527. doi: 10.1080/00140139.2017.1369583. Epub 2017 Sep 8.
The distinction between several components of mental workload is often made in the ergonomics literature. However, measurements used are often established from a global score, notably with several questionnaires that originally reflect several dimensions. The present study tested the effect of driving situation complexity, experience and subjective levels of tension and alertness on each dimension of the NASA-TLX questionnaire of workload, in order to highlight the potential influence of intrinsic, extraneous and germane load factors. The results showed that, in complex situation, mental, temporal and physical demand (load dimensions) increased, and that novice drivers presented high physical demand when subjective tension was low on performance. Moreover, increase of mental and physical demand increased effort. It thus, appears essential to distinguish the different components of mental workload used in the NASA-TLX questionnaire. Practitioner Summary: Currently, global score of NASA-TLX questionnaire is used to measure mental workload. Here, we considered independently each dimension of NASA-TLX, and results showed that mental load factors (driving situation complexity, experience, subjective tension and alertness) had a different effect on dimensions, questioning global score use to evaluate workload.
人体工程学文献中经常会区分心理负荷的几个组成部分。然而，所使用的测量方法通常是基于一个总体得分确定的，特别是通过一些最初反映多个维度的问卷。本研究测试了驾驶情境复杂性、经验以及紧张和警觉的主观水平对美国国家航空航天局任务负荷指数（NASA-TLX）问卷中工作负荷各维度的影响，以突出内在、外在和关联负荷因素的潜在影响。结果表明，在复杂情境中，心理、时间和体力需求（负荷维度）增加，并且新手驾驶员在表现上主观紧张程度较低时体力需求较高。此外，心理和体力需求的增加会加大努力程度。因此，区分NASA-TLX问卷中所使用的心理负荷的不同组成部分显得至关重要。从业者总结：目前，NASA-TLX问卷的总体得分用于测量心理负荷。在此，我们独立考虑了NASA-TLX的每个维度，结果表明心理负荷因素（驾驶情境复杂性、经验、主观紧张程度和警觉性）对各维度有不同影响，这对使用总体得分来评估工作负荷提出了质疑。
