Key result
Prolonged driving fatigue correlates with decreased occipital oxygenation and increased EEG power bands.
Why the study?
Fatigue during driving leads to attention difficulties and behavioral lapses, but the relationships between brain hemodynamic and electrical features and driving performance are not fully understood.
Observational (n=16)
No
p-value: p=<0.05
Combined hemodynamic and electrodynamic activities measured via fNIRS and EEG can provide insights into brain state changes during driving fatigue.
Combined EEG-fNIRS correlates with driving fatigue performance; leaves open validation in larger prospective trials before monitoring use.
Fatigue is one problem with driving as it can lead to difficulties with sustaining attention, behavioral lapses, and a tendency to ignore vital information or operations. In this research, we explore multimodal physiological phenomena in response to driving fatigue through simultaneous functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) recordings with the aim of investigating the relationships between hemodynamic and electrical features and driving performance. Sixteen subjects participated in an event-related lane-deviation driving task while measuring their brain dynamics through fNIRS and EEGs. Three performance groups, classified as Optimal, Suboptimal, and Poor, were defined for comparison. From our analysis, we find that tonic variations occur before a deviation, and phasic variations occur afterward. The tonic results show an increased concentration of oxygenated hemoglobin (HbO2) and power changes in the EEG theta, alpha, and beta bands. Both dynamics are significantly correlated with deteriorated driving performance. The phasic EEG results demonstrate event-related desynchronization associated with the onset of steering vehicle in all power bands. The concentration of phasic HbO2 decreased as performance worsened. Further, the negative correlations between tonic EEG delta and alpha power and HbO2 oscillations suggest that activations in HbO2 are related to mental fatigue. In summary, combined hemodynamic and electrodynamic activities can provide complete knowledge of the brain’s responses as evidence of state changes during fatigue driving.
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Lin et al. (2019) conducted an observational in Driving fatigue (n=16). Prolonged simulated driving task vs. Optimal performance (baseline/alert state) was evaluated on Correlation between HbO2 concentrations, EEG frequency bands, and driving performance (reaction time) (p=<0.05). Prolonged simulated driving induced fatigue that was significantly correlated with decreased occipital oxygenated hemoglobin (HbO2) concentrations and increased EEG theta, alpha, and beta power (p<0.05).
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