As John zeroes in on one shopper among the fifty, he manages to ignore the other forty-nine, and everything else—a feat of concentration amid a sea of distraction. Such panoramic awareness, alternating with his constant vigilance for a telling but rare signal, demands several varieties of attention—sustained attention, alerting, orienting, and managing all that—each based in a distinctly unique web of brain circuitry, and each an essential mental tool.
— Focus: The Hidden Driver of Excellence (Daniel Goleman), Loc. 66–70