European isolation and confinement study. Cognitive fatigue in complex decision-making

Area of Science:

• Space exploration and human factors
• Cognitive psychology
• Hyperbaric medicine

Background:

• Understanding mental fatigue is crucial for long-duration space missions.
• Isolation and confinement can impact cognitive performance.
• Previous research has explored the effects of confinement on mental well-being.

Purpose of the Study:

• To assess mental fatigue in healthy males during a 4-week confinement in a hyperbaric chamber.
• To evaluate the impact of isolation on working memory and decision-making processes.
• To identify potential changes in cognitive functioning over time.

Main Methods:

• Six healthy males participated in a 4-week hyperbaric chamber confinement.
• A Working Memory Test involving decision-making on spacecraft environmental management was administered.
• Key performance parameters recorded included memorizing time, decision-making time, checking-back time, total time, and error percentage.

Main Results:

• Group average performance measures remained relatively constant over the final 3 weeks of isolation.
• Trends indicated slight, non-significant increases in memorizing and checking-back times, and a decrease in decision-making time.
• A statistically significant increase in checking-back time was observed on weekends, suggesting potential weekly fatigue patterns.

Conclusions:

• Four weeks of isolation in a hyperbaric chamber did not induce strong overall negative effects on mental functioning in healthy males.
• Individual variability and potential cognitive breakdowns warrant further investigation with extended isolation and training.
• Future research should focus on longer pre-isolation training and confinement periods to clarify generalizability of findings.