That popping in and out effect is actually a classic characteristic of motion-induced blindness! It happens because your brain is constantly trying to reconcile the conflicting information from stationary objects (the yellow dots) and the motion in your field of vision. As your brain tries to prioritize what it perceives as important, the dots may vanish, only to reappear moments later when your visual system “resets” or re-evaluates the scene. This fluctuation highlights how our perception is a dynamic process, not just a static reception of sensory data. It’s constantly filtering and interpreting information, sometimes even to the point of erasing things from awareness, then bringing them back as priorities shift. The longer you stare, the more likely this popping effect is to occur, since your brain is actively balancing different visual inputs. It's a fun (and slightly bizarre) insight into how the brain works!