Abstract
This study evaluates driver's workload by measuring brain activity. Driver's brain activity is measured using near-infrared spectroscopy(NIRS). Whether the reduction of driving workload by Adaptive Cruise Control (ACC) system can be evaluated from brain activity was discussed through experiments using a driving simulator. Effect of the using with ACC was evaluated using "separability" index obtained from feature plane of oxy-Hb and its differential value. Results showed that a large separability was appeared in outer portion of frontal cortex for without ACC. This result showed that the separability index was useful for evaluation of driver's workload.
