The goal of this project is to design a monitoring system which continuously observes the driver's cognitive state and provides a realtime feedback for the driver regarding his/her mental state and vigilance level, as described in the “Background Information” section. Studies in [5-9] have examined the changes in the theta, alpha, and beta EEG rhythms during different driving tasks and have shown a significant correlation between the changes in spectral power of EEG signals and the driver's workload and fatigue level.