Key result
Vehicle movements during steady-state cornering, specifically yaw rate and velocity, increased drivers' mental workload as measured by an elevated LF/HF ratio in heart rate variability.
Observational (n=6)
No
Vehicle movement parameters during steady-state cornering can induce mental workload in drivers, which can be quantified using wavelet analysis of heart rate variability.
May inform vehicle dynamics design to reduce driver stress; hypothesis-generating for HRV applications and requires prospective validation.
The behavior of driver is formed by recognition, decision and operation. Driver have to grasp parameters such as changing of surroundings and movements of the automobile. These are chances that vehicle movements might be drivers' mental-workload and cause them to make mistakes in judgment and to disturb their operation of the car. In this report, we measured drivers' physical reaction, and vehicle movements such as velocity, acceleration, yaw rate and roll rate through the steady-state cornering test. In order to consider time-series factors of physical reaction, we used Wavelet Analysis from R-R interval of heart beat variability to clarify activities of autonomic nerve. As a result, we could specify the parameters of vehicle movements which cause drivers' mental-workload. In addition, we could make a specific group of drivers who easily get the mental-workload from vehicle movements by using HQL Workload Sensitivity Questionnaire based on drivers' individual characteristics.
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YOKOMORI et al. (2009) conducted an observational in Healthy drivers (n=6). Vehicle movement (yaw rate and velocity) during steady-state cornering vs. Resting state (before and after driving) was evaluated on Mental workload assessed by LF/HF ratio from heart rate variability using wavelet analysis. Vehicle movements during steady-state cornering, specifically yaw rate and velocity, increased drivers' mental workload as measured by an elevated LF/HF ratio in heart rate variability.
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