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Information complexity--mental workload and performance in combat aircraft.

E Svensson1, M Angelborg-Thanderz, L Sjoberg

  • 1National Defence Research Establishment, Linkoping, Sweden.

Ergonomics
|March 1, 1997
PubMed
Summary
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Increased information complexity significantly impacts pilot performance and mental workload. Even moderate complexity degrades flight task execution, affecting altitude control and response times, highlighting the need for optimized display design.

Area of Science:

  • Aviation Psychology
  • Human Factors Engineering
  • Cognitive Science

Background:

  • Pilot Mental WorkLoad (PMWL) and Pilot Performance (PP) are critical in aviation safety.
  • Understanding the impact of information complexity on cognitive processes is essential for designing effective flight systems.

Purpose of the Study:

  • To analyze the effects of information complexity on PMWL and PP.
  • To investigate the underlying structure of PMWL in simulated flight scenarios.

Main Methods:

  • Eighteen pilots performed simulated low level-high speed missions with varying Head Down Display (HDD) information complexity.
  • Continuous flight data recording, eye movement tracking, and psychophysiological measures (Heart Rate) were collected.
  • Subjective workload ratings (Bedford, SWAT, NASA-TLX) and questionnaires assessed performance, information load, and mood.

Related Experiment Videos

Main Results:

  • Moderate information complexity negatively impacted flight tasks, increasing altitude deviations and delaying error corrections.
  • Information load changes significantly affected flight performance (r = 0.60) with a 20-40 second delay.
  • Flight task performance correlated positively with Tactical Situation Awareness (TSA) (r = 0.59).
  • Eye fixation patterns (Head Up vs. Head Down) varied with information load.
  • A structural equation model indicated mission complexity influenced PMWL, which in turn affected flight performance and information handling.
  • Heart rate correlated with PMWL and perceived mission complexity.
  • Heart rate variability analysis showed changes related to information complexity in high-performing pilots.

Conclusions:

  • Information complexity is a significant factor influencing pilot mental workload and performance.
  • Optimizing information display and management is crucial for mitigating negative effects on flight safety.
  • Psychophysiological and subjective measures provide valuable insights into pilot cognitive states during complex tasks.