Hi all, I'm a first time poster in Biology, and I'm not sure if this question belongs in Biology or Medicine. (I normally hang out over in quantum physics.) What is currently known about the detailed neurological/biological mechanism by which humans perceive the passage of time? Simple watches are designed such that we perceive the spacing of ticks of each second to be approximately equal. Presumably this is related to some continuous dynamical process in the brain? If so, is this mechanism well understood at present?