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Maritime watch schedules impact crew cognitive function. Some schedules impair performance, while others show reduced cognitive stability throughout the day, affecting vigilance and safety.

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Area of Science:

  • Maritime Safety
  • Human Factors
  • Cognitive Psychology

Background:

  • Maritime industries rely on 24/7 watchkeeping schedules for crew safety.
  • Existing schedules can be fatiguing, negatively impacting vigilant attention.
  • The effects of alternative, sleep-optimized schedules on higher-order cognitive function are not well understood.

Purpose of the Study:

  • To investigate the impact of four different watchkeeping schedules on higher-order cognitive functions in maritime personnel.
  • To assess cognitive performance using tasks relevant to real-world maritime operations.
  • To compare the stability of cognitive function across different schedules.

Main Methods:

  • A 10-day laboratory study involving 27 participants.
  • Comparison of four watchkeeping schedules: 8/8/4/4 (A), 6/6 (B), 4/4/4/4/4/4 with early sleep (C), and 4/4/4/4/4/4 with late sleep (D).
  • Assessment of visual scanning, learning, working memory, mental flexibility, and visuomotor control 2-3 times daily while 'on watch'.

Main Results:

  • Cognitive function was ranked lowest across most tasks in schedule B (6/6).
  • The stability of higher-order cognitive function was poorest throughout the waking day in schedule A (8/8/4/4).
  • Significant variability in cognitive capacities was observed across the different schedules.

Conclusions:

  • Watchkeeping schedules significantly influence higher-order cognitive functions in maritime settings.
  • Schedule B appears detrimental to overall cognitive performance.
  • Schedule A may lead to greater fluctuations in cognitive stability during watch periods.
  • Findings underscore the importance of carefully considering schedule design to optimize cognitive function and safety at sea.