As depicted in Figure 3 , the EEG indices R ( α / β ) , R θ /( α + β ) , and R ( α + θ )/( α + β ) exhibited an increasing trend over time during the driving task.
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Scented Solutions: Examining the Efficacy of Scent Interventions in Mitigating Driving Fatigue.
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demonstrated a decreasing trend in the ( β / α ) ratio as driving fatigue increased [ 31 ].