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Cognitive fatigue: A Time-based Resource-sharing account.

Guillermo Borragán1, Hichem Slama1, Mario Bartolomei1

  • 1UR2NF, Neuropsychology and Functional Neuroimaging Research Unit at CRCN, Centre de Recherches en Cognition et Neurosciences and UNI - ULB Neurosciences Institute, Université Libre de Bruxelles (ULB), Belgium, Brussels, Belgium.

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Summary
This summary is machine-generated.

Cognitive fatigue (CF) arises from high cognitive load due to time constraints, not task complexity. Sustained demands, regardless of difficulty, lead to this exhaustion and reduced alertness.

Keywords:
Cognitive FatigueCognitive loadIndividual differencesProcessing timeSleepinessTBRS model

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human factors

Background:

  • Cognitive Fatigue (CF) significantly impacts cognitive performance, but its triggers and subjective experience remain poorly understood.
  • Existing theories lack a clear explanation for how cognitive effort becomes perceived as exhausting.
  • The Time-based Resource-sharing (TBRS) model provides a framework for understanding cognitive load and resource allocation.

Purpose of the Study:

  • To investigate the hypothesis that Cognitive Fatigue (CF) is a consequence of increased cognitive load imposed by time constraints.
  • To differentiate the effects of task complexity versus processing time on the development of CF.
  • To examine the relationship between cognitive load, processing time, and subjective feelings of fatigue and alertness.

Main Methods:

  • Two experiments were conducted using the TloadDback paradigm, a working memory dual task.
  • Experiment 1 manipulated cognitive load (high vs. low) while keeping task complexity constant.
  • Experiment 2 manipulated task complexity while individually adjusting processing time to induce high cognitive load.

Main Results:

  • Experiment 1 showed significantly higher CF in the high cognitive load (HCL) condition compared to the low cognitive load (LCL) condition.
  • Experiment 2 revealed similar levels of CF across different task complexities when processing time was adjusted to induce HCL.
  • Results indicate that processing time-induced cognitive load, rather than task complexity, is the primary driver of CF and decreased alertness.

Conclusions:

  • Cognitive fatigue develops as a result of sustained cognitive demands, particularly when constrained by processing time.
  • The subjective experience of exhaustion and reduced alertness is linked to processing time-related cognitive load.
  • Task complexity alone does not determine the onset of cognitive fatigue; sustained cognitive load is the key factor.