The document discusses measures of mental workload in drivers. It defines mental workload and provides a model with three hierarchical levels of driving tasks. Factors like the road environment, traffic, and vehicle ergonomics can affect driver workload. Various measures are described, including self-reports, primary task performance, secondary tasks, and physiological measures. Each measure has different characteristics in terms of sensitivity, reliability and ability to diagnose specific mental processes. Optimal driver performance occurs at low workload levels, and combining multiple measures provides the best assessment of a driver's mental workload.

1. Measurements of Mental Workload Presented by: Yi xiaoli G0502680F

10. Workload and performance in 6 regions Task performance and workload as a function of demand figure 2

20. Properties of self-report measures high high operator acceptance low low implementation requirements low low primary-task intrusion high (?) high Reliability (?) prob. high selectivity low low diagnosticity D, (B-C) (D-)A1, A3-B sensitivity (Region) Activation RSME Property Measure Summary of properties of self-report workload measures .

21. Properties of primary-task performance measures high high operator acceptance low high implementation requirements none none primary-task intrusion high high Reliability (low) (low) selectivity low low diagnosticity D, B D, B sensitivity (Region) SDSTW SDLP Property Measure Summary of properties of primary-task workload measures .

22. Properties of secondary-task workload measures high high high operator acceptance high high high implementation requirements low low low-moderate primary-task intrusion high ? high Reliability moderate (?) ? moderate (?) selectivity moderate-high moderate (?) low-moderate diagnosticity A3-B ? D-A1, A3-B sensitivity (Region) Mirror checking (frequency) Mirror checking (duration) Delay in car following Property Measure Summary of properties of secondary-task workload measures .

23. Properties of physiological workload measures high-moderate 1 high high high moderate operator acceptance high high moderate moderate high implementation requirements 1 low low low low primary-task intrusion ? high high high moderate-high Reliability ? moderate-high low-moderate low low selectivity high low low low low diagnosticity A3(?) A3 D, B D, B D-A2 sensitivity (Region) Eye movements (fixations/minute) ECG: .10 Hz ECG: HRV ECG: HR EEG Background Property Measure

25. Characteristics of measures Workload in 6 regions and sensitivity of different measures to driver mental workload

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