A self-analysis of the NASA-TLX workload measure

Noyes, Jan; Bruneau, Daniel P. J.

doi:10.1080/00140130701235232

Cited by 147 publications

(76 citation statements)

References 5 publications

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“…In this respect it may be useful to include in future studies a workload index, as discussed in several recent studies (Pretorius & Cilliers, 2007;Noyes & Bruneau, 2007 ;Roth, Scott, Deutsch, Kuper, Schmidt, et al ., 2006). Thus, though no direct relation may exist between the present results and real-job performance, the neuropsychological tests enabled suitable outcome measures reflecting cognitive processes also involved in real-job operations.…”

Section: Discussionmentioning

confidence: 99%

Investigation of task performance variations according to task requirements and alertness across the 24-h day in shift workers

2008

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The study investigated time-of-day effects on task performance in shift-workers in different tasks (reaction-time, discrimination, probe recognition, free recall), by varying task-specific features. On each of six recordings, each programmed on a different day and in a randomized order, operators rated alertness and performed different tasks. Self-rated alertness varied according to a typical diurnal trend.Time of day also affected reaction time (slower responses at 03:00), discrimination performance (lower accuracy at 03:00 in the most difficult condition), and recall (superior recall at 07:00 and 11:00 following deeper processing at encoding). The data demonstrated time-of-day effects on cognitive processes also involved in many real-job activities, despite the lack of control for a number of exogenous factors known to interfere with performance in work settings. Since in the cognitively more loaded tasks, time-of-day effects depended on task conditions, the findings are of operational concern in shift-work situations involving differential task requirements.Keywords: Shift-workers, Alertness, Reaction time, Non-verbal Discrimination, Memory TasksPage 2 of 68 URL: http://mc.manuscriptcentral.com/terg E-mail: ergonomics@tandf.co.uk Ergonomics 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Statement of relevanceIn a real-job setting, performance variations were observed according to time-ofday and task-requirements in a set of cognitively more or less demanding tasks.Task-specific research across the 24-h day enables a better understanding of operators' tasks and the development of supporting technology. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 IntroductionOver the last few decades, a number of studies showed how performance measures are affected by sleep drive (homeostatic influence) and circadian phase.The demonstration of an interaction of circadian phase and time awake in the regulation of performance came from laboratory studies under controlled conditions and/or manipulation of the sleep/wake cycle (for a review, Akerstedt, 2007). Several theoretical models conceptualized this interaction by proposing an optimal position and duration for sleep, with any deviation impairing performance and alertness (Folkard & Akerstedt, 1992;Achermann & Borbély, 1994; Van Dongen, Maislin, Mullington, & Dinges, 2003). Systematic performance measures in relation to different simulated shift systems further confirmed a sharp performance drop in the early morning hours (Colquhoun, 1969). This was observed in most tasks that require sustained attention, such as reaction time performance or throughput in cognitive tasks (Fröberg, 1975;Colquhoun, 1968; Johnson, 19...

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Section: Discussionmentioning

confidence: 99%

Investigation of task performance variations according to task requirements and alertness across the 24-h day in shift workers

2008

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“…The original NASA-TLX consists of two parts: rating each aspect, and comparing them pairwise based on their perceived importance. However, it has been shown that the unweighted and the weighted ratings have a high correlation (Noyes and Bruneau 2007). In this study, the outcome of the NASA-TLX was calculated based on the unweighted ratings.…”

Section: Study Setupmentioning

confidence: 99%

The influence of automation on tumor contouring

et al. 2017

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Fully or semi-automatic contouring tools are increasingly being used in the tumor contouring task for radiotherapy. While the fully automatic contouring tools have not reached sufficient efficiency, the semi-automatic contouring tools balance more effectively between the human interaction and automation. This study evaluates the influences of a semi-automation contouring tool, called between-slice interpolation, on the resulting contours and the contouring process. The tumor contouring study was conducted on three patient cases with five physicians in a naturalistic setting. The contouring task consisted of initiating the 2D contour manually or with the interpolation tool and correcting that initial contour. The similarity of the resulting contours was pairwise measured within the manual or the interpolated category. Interactions with the software were recorded, and variations in the contouring workflows steps were compared. Results indicated that using the between-slice interpolation tool for creating the initial contour, instead of initiating it manually, influenced both the contouring process and outcomes. First, it was identified that contours initiated by the interpolation tool showed an increased similarity among themselves compared to the manually initiated contours. At the same time, influences to the resulting contours were below clinical relevance, and toward the desired direction-improved consistency of contours. Second, when interpolation was used, in two cases out of three, the average contouring time also decreased significantly. Therefore, the use of such an automation tool can be encouraged.

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“…Type I were the least severe collisions while Type III were of highest severity. The self-reported, survey-based NASA-TLX subjective workload index along with its four subscales (Mental Demand [TLX-MD], Physical Demand [TLX-PD], Effort [TLX-E], and Frustration [TLX-F]) were used as subjective dependent variables [28][29][30].…”

Section: Dependent Variablesmentioning

confidence: 99%

Clinical evaluation of semiautonomous smart wheelchair architecture (Drive-Safe System) with visually impaired individuals

Sharma

Simpson²,

LoPresti³

et al. 2012

JRRD

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Abstract-Nonambulatory, visually impaired individuals mostly rely on caregivers for their day-to-day mobility needs. The Drive-Safe System (DSS) is a modular, semiautonomous smart wheelchair system aimed at providing independent mobility to people with visual and mobility impairments. In this project, clinical evaluation of the DSS was performed in a controlled laboratory setting with individuals who have visual impairment but no mobility impairment. Their performance using DSS was compared with their performance using a standard cane for navigation assistance. Participants rated their subjective appraisal of the DSS by using the National Aeronautics and Space Administration-Task Load Index inventory. DSS significantly reduced the number and severity of collisions compared with using a cane alone and without increasing the time required to complete the task. Users rated DSS favorably; they experienced less physical demand when using the DSS, but did not feel any difference in perceived effort, mental demand, and level of frustration when using the DSS alone or along with a cane in comparison with using a cane alone. These findings suggest that the DSS can be a safe, reliable, and easy-to-learn and operate independent mobility solution for visually impaired wheelchair users.

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A self-analysis of the NASA-TLX workload measure

Cited by 147 publications

References 5 publications

Investigation of task performance variations according to task requirements and alertness across the 24-h day in shift workers

Investigation of task performance variations according to task requirements and alertness across the 24-h day in shift workers

The influence of automation on tumor contouring

Clinical evaluation of semiautonomous smart wheelchair architecture (Drive-Safe System) with visually impaired individuals

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