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The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies

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A plausible link between the time-on-task effect and the sequential task effect.

Thomas Mangin^1,2,3, Michel Audiffren¹, Alison Lorcery¹

¹Centre de Recherches sur la Cognition et l'Apprentissage (CeRCA), UMR CNRS 7295, Université de Poitiers, Poitiers, France.

Frontiers in Psychology

|November 17, 2022

Summary

This study investigated mental fatigue using combined protocols. Mental fatigue effects observed over time on a task correlate with performance decrements on a subsequent task, suggesting shared mechanisms.

Keywords:

boredom ego depletion mental fatigue sequential task protocol time-on-task

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Area of Science:

Cognitive Psychology
Neuroscience
Human Factors

Background:

Mental fatigue is typically studied using time-on-task or sequential task protocols.
Time-on-task reveals performance decline over extended effort.
Sequential tasks show worse performance on a second task after an initial fatiguing task.

Purpose of the Study:

To examine the relationship between performance decrements in time-on-task and sequential task protocols.
To investigate if these two common measures of mental fatigue share underlying mechanisms.
To assess the correlation between performance changes during an initial task and a subsequent task.

Main Methods:

A combined time-on-task and sequential task protocol was employed.
Eighty-three participants completed a 30-minute modified Stroop task (fatiguing) or a control task.
Following the initial task, participants performed a time-to-exhaustion handgrip task.

Main Results:

A decrease in performance was observed over time during the Stroop task.
Handgrip task performance was significantly worse after the Stroop task compared to the control task.
A positive correlation was found between performance decrements in both tasks.

Conclusions:

The findings support the hypothesis that time-on-task and sequential task decrements share common underlying mechanisms.
While related, these two phenomena of mental fatigue are not entirely equivalent.
Subjective reports of boredom and fatigue correlated with Stroop task decline but not with the subsequent handgrip task effect.