"Chronostasis (from Greek χρόνος, chrónos, "time" and στάσις, stásis, "standing") is the illusion in which the first impression following a saccade (quick eye movement) appears to be extended in time. The most well-known version of this illusion is the stopped-clock illusion, where the first movement of the second hand of an analog clock, following the viewer's directing attention to the clock, appears to take longer than the next movement.
When eyes execute a saccade, perception of time stretches slightly backward.
The viewer's brain registers that they have been looking at the clock
for slightly longer than they really have, producing the illusion that
the second-hand is frozen for more than a second. Although this happens
every time the eyes move from one fixation point to the next, it is
rarely noticed. Experiments have suggested that this illusion may be
caused by the way in which the brain attempts to construct a continuous
conscious experience in spite of saccades, causing it to "fill in the
gap." Although this effect is present with all eye movements, it is most noticeable when an external time-keeping source is observed.
This effect is not only present in visual observation, but also
noticed with auditory stimuli. An example is the spaces between ringing
tones when making a telephone call, which may be illusorily lengthened
if the caller puts the receiver to one side for a time before returning
it to their ear. Research suggests that a common timing mechanism may
underlie chronostasis."
Credit:
Wikipedia