Eli5: when looking around a room your eyes jump from point to point, but when following a moving object they move smoothly. Why can’t they move smoothly when scanning a room?
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When you follow a moving object, your eyes can move smoothly because your brain knows where the object is going. It can predict the movement, so your eyes can follow it smoothly without jumping. But when you’re scanning a room, your brain doesn’t know where to look next, so it has to keep jumping from one point to another to see everything. That’s why your eyes move in small spurts, instead of moving smoothly like when you follow a moving object.
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