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Mental Workload

Mental Workload. What is Mental Workload?. Why measure it? Performance limits Predict top performance Tasks Cognitive/perceptual multiple. High Air traffic control Pilot Military command & control Nuclear power plant operator anesthesiologist. N/A Computer programmer

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Mental Workload

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  1. Mental Workload

  2. What is Mental Workload? • Why measure it? • Performance limits • Predict top performance • Tasks • Cognitive/perceptual • multiple

  3. High Air traffic control Pilot Military command & control Nuclear power plant operator anesthesiologist N/A Computer programmer College professor Mathematician Technical writer What kind of tasks have High mental workload?

  4. Key Elements for High mental workload tasks • Stimulus driven not self paced • Large fluctuations in demand • Multiple simultaneous tasks • High stress/High consequence

  5. Workload & Arousal Yerkes-Dobson law Low arousal Low performance Moderate arousal High performance Over arousal Low performance

  6. Basic approaches to measuring mental workload • Analytic • Task difficulty • Number of simultaneous tasks • Task performance • Primary task • Secondary task • Physiological (arousal/effort) • Subjective assessment

  7. Analytic Models • Tracking models predict based on systems dynamics • Queuing models predict on the basis of task co-occurrence • SAINT / microSAINT best developed queuing models

  8. Resources/Attention • Some limited capacity • Unitary: task always depletes common pool by a constant amount • Multiple: task depletes pools of resources to varying degrees • Mixed: cost of sharing even for highly dissimilar resources

  9. Simplified HIP Model S E N S O R Y S T O R E Attention Long Term Memory Working Memory Unconscious/Automatic Processes

  10. heart rate: sinus arrhythmia blood pressure respiratory rate variability tidal volume ventilation galvanic skin response evoked response amplitude evoked response latency evoked response latency electroencehpalogram, spectral components time domain, flicker fusion frequency pupil diameter electromyograms electrooculograms Physiological Measures

  11. Subjective Workload Measures • Cooper-Harris • Manual control characteristics • SWAT • Dimension based instrument • NASA • 6-D assessment scales

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