I have long been interested in how we perceive time. There are many markers of time’s passage, daily and seasonal changes and biological changes being just some of them. Albert Einstein revolutionized our understanding of time by saying that physical time of an event is what is given by clocks placed at the location of the event, and then showed that the interval in clock readings between any two events depended on the state of motion of the clocks.
But there is also the psychological perception of time, the sense of how much time has elapsed when one has no external means such as a clock or diurnal rhythms to keep track of it. In an experiment, 15 volunteers were kept in a deep cave for 40 days without any means of knowing the passage of time other than their sense of it.
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