Objective but not subjective fatigue increases cognitive task avoidance
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Mentally demanding tasks feel effortful and are usually avoided. Furthermore, prolonged cognitive engagement leads to mental fatigue, consisting of subjective feeling of exhaustion and decline in performance. Despite the intuitive characterization of fatigue as an increase in subjective effort perception, the effect of fatigue on effort cost has never been tested experimentally. To this end, sixty participants in 2 separate experiments underwent a forced-choice working memory task following either a fatigue-inducing (i.e. Stroop task) or a control manipulation. We measured subjective fatigue and effort as well as their objective behavioral signatures: performance decline and task avoidance, respectively. We found that fatigue-induced performance decline was correlated with task avoidance, while the feelings of fatigue and effort were unrelated to each other. Our findings highlight the discrepancy between subjective and objective manifestations of fatigue and effort, and provide valuable evidence feeding the ongoing theoretical debate on the nature of these constructs.
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Objective fatigue can rise without corresponding subjective recognition of fatigue.
“This dissociation is not unprecedented as Benoit et al. (2017) found that objective fatigue can rise without corresponding subjective recognition of fatigue as feelings of fatigue and effort were unrelated in a Stroop task.”
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Mortimer, H., Dallaway, N., Díaz‐García, J., & Ring, C. (2026) · European Journal of Sport Science · doi:10.1002/ejsc.70163 · Cited by 2 · see citing works
- Authors
- Benoit, C.-E., Solopchuk, O., Borragán, G., Carbonnelle, A., Van Durme, S., & Zénon, A.
- Affiliations
- Institut de Neurosciences Cognitives et Intégratives d’Aquitaine (FR)
- Université Libre de Bruxelles (BE)
- UCLouvain (BE)
- Venue
- bioRxiv (Cold Spring Harbor Laboratory)
- Publisher
- openRxiv
- Published
- 2017-10-24
- OpenAlex
- W2765586196
- Cited by
- 4
- References
- 5
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2017: 1
- Type
- posted content
- Language
- en
- Open access
- green
- doi.org
- Licence
- cc-by-nc-nd
- Locations
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- Funders
- Fondation Louvain
- Fonds De La Recherche Scientifique - FNRS
- Fondation Médicale Reine Elisabeth
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Social Sciences › Psychology › Social Psychology › Human-Automation Interaction and Safety
- Keywords
- mental fatigue, task avoidance, effort cost, subjective fatigue, effort perception, performance degradation, working memory, Stroop task, cognitive effort
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