The brain as a timekeeper
Hoagland proposed one of the first models for how the brain keeps time, based partly on his wife’s behavior when she had the flu. She complained that he’d been away from her bedside too long, he later recalled, when he’d been gone only a short while. So Hoagland proposed an experiment: she would count off sixty seconds while he timed her with his watch. It’s not hard to imagine her annoyance at this suggestion, or his smugness afterward: when her minute was up, his clock showed thirty-seven seconds. Hoagland went on to repeat the experiment again and again, presumably over his wife’s delirious objections (her fever rose above a hundred and three). The result was one of the classic graphs of time-perception literature: the higher his wife’s temperature, Hoagland found, the shorter her time estimate. Like a racing engine, her mental clock went faster the hotter it got.
Source: David Eagleman and the Mysteries of the Brain: The New Yorker