The Role of Motivation as a Factor in Mental Fatigue

Human Factors
Mega B HerlambangFokie Cnossen

Abstract

The aim of this study was to assess motivation as a factor in mental fatigue using subjective, performance, and physiological measures. Sustained performance on a mentally demanding task can decrease over time. This decrement has two possible causes: a decline in available resources, meaning that performance cannot be sustained, and decrement in motivation, meaning a decline in willingness to sustain performance. However, so far, few experimental paradigms have effectively and continuously manipulated motivation, which is essential to understand its effect on mental fatigue. Twenty participants performed a working memory task with 14 blocks, which alternated between reward and nonreward for 2.5 hr. In the reward blocks, monetary rewards could be gained for good performance. Besides reaction time and accuracy, we used physiological measures (heart rate variability, pupil diameter, eyeblink, eye movements with a video distractor) and subjective measures of fatigue and mental effort. Participants reported becoming fatigued over time and invested more mental effort in the reward blocks. Even though they reported fatigue, their accuracy in the reward blocks remained constant but declined in the nonreward blocks. Furthermore, in the ...Continue Reading

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Citations

Jan 26, 2021·Frontiers in Psychology·Thomas JacquetRomuald Lepers
Feb 11, 2021·Military Medicine·Theresa SchweizerRahel Gilgen-Ammann
Feb 23, 2021·PloS One·Tanya BafnaJohn Paulin Hansen
Mar 9, 2021·Psychophysiology·Stefan ArnauEdmund Wascher
Mar 13, 2021·Sports Medicine·Jelle HabayBart Roelands
Apr 8, 2021·Psychophysiology·Tanya Bafna, John Paulin Hansen
May 1, 2021·International Journal of Environmental Research and Public Health·Tomás García-CalvoJesús Díaz-García

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