Difference between the the “time to reported-fatigue” and “time to detected-fatigue” in seconds using different thresholds for the fatigue detection algorithm.

Time-gap was calculated only for those subjects who had instances of both reported and detected fatigue. For the other participants, the time-gap could not be calculated due to the absence of a reported-fatigue because of the reasons mentioned above. Also, a few other subjects had a negative time-gap due to reporting fatigue prior to automatically detecting fatigue.