Cerebellar visual perseveration
One function of the part of the brain called the cerebellum (which is just below the occipital lobes), is to deal with time, so that the timing in our minds matches the timing of real world events. If the cerebellum is not functioning typically, it may process time more slowly, which can make what a person is looking at less clear. So a ball moving has been described to us as looking more like a long sausage shape, because the time processing by the mind is slower than the movement of the ball.