 Time perception is handled by a highly distributed system involving the cerebral cortex, cerebellum and basal ganglia.One particular component, the suprachiasmatic nucleus, is responsible for the circadian (or daily) rhythm, while other cell clusters appear to be capable of shorter (ultradian) timekeeping.There is some evidence that very short (millisecond) durations are processed by dedicated neurons in early sensory parts of the brain

Professor Warren Meck devised a physiological model for measuring the passage of time.