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Cognitive fatigue and complex decision making under prolonged isolation and confinement

G R Hockey1, J Sauer

  • 1Department of Psychology, University of Giessen, Germany.

Advances in Space Biology and Medicine
|January 1, 1996
PubMed
Summary

Astronauts in isolation experienced increased fatigue and decision times during a 60-day simulated space mission. Individual adaptation varied, with some maintaining performance by slowing down, while others showed performance decrements.

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Area of Science:

  • Space Medicine
  • Human Factors Engineering
  • Cognitive Psychology

Background:

  • Prolonged spaceflight necessitates understanding cognitive function under isolation.
  • Simulated space station environments are crucial for testing astronaut performance.
  • Cognitive fatigue and subjective states are key concerns for long-duration missions.

Purpose of the Study:

  • To assess cognitive fatigue and subjective states in healthy subjects during 60-day isolation.
  • To evaluate performance on a working memory/decision-making task simulating spacecraft management.
  • To analyze individual adaptation patterns to prolonged confinement.

Main Methods:

  • Four healthy subjects lived in a hyperbaric chamber simulating a space station for 60 days.

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  • Participants performed daily working memory/decision-making tasks related to spacecraft contaminant management.
  • Performance metrics included error rates, decision time, and reference check time; subjective measures assessed workload, resources, anxiety, and effort.

    • Main Results:

    • All subjects showed increased decision and check times in later isolation weeks; one subject had increased errors.
    • Fatigue levels elevated in the second half of isolation, especially for subjects maintaining low error rates.
    • Individual adaptation varied: two subjects maintained low errors by increasing effort and slowing performance, while others showed broader decrements.

    Conclusions:

    • Prolonged isolation in simulated space environments impacts cognitive performance and subjective states.
    • Individual differences in adaptation strategies are evident, influencing performance outcomes.
    • Analyzing these individual patterns is vital for predicting and mitigating the effects of spaceflight confinement.