“…In the current work, we defined it as the FSR of driving fatigue that is regulated autonomously and internally. That is, during the FSR, subject would recover the behavioral performance by spontaneously, passively, and without active human involvement to adjust itself to fatigue, which is unlike the self-regulation process in a recent work by Love and colleagues [45], where the self-regulation was caused by shift of attentional control through extra activities (including advance road familiarization, talking to oneself, listening to music or media, talking to others, opening windows, readjusting sitting position, etc). Heuristically, these activities were considered as intentionally attention-switch, which may lead to fatigue recovery in comparison with the passively FSR.…”