It’s called [chronostasis](https://en.m.wikipedia.org/wiki/Chronostasis). Essentially your eye movement would normally create an incomprehensible blurry image. Your brain drops this blurry image and then covers up the gap with an image of the next thing you look at, the second hand on your clock in this case.
This is called [Chronostasis](https://en.wikipedia.org/wiki/Chronostasis).
From my understanding, it happens when your eyes move on to a new “target” your brain fills the blur in between your eyes moving with whatever you happen to be looking at by the end. Thus, it feels like the clock stops just as you’re looking at it because your brain just repeated the new image to fill the “blanks”.
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