In this video excerpt from NOVA scienceNOW: “How Does the Brain Work?” scientists team up with magician Apollo Robbins to research how our brains decide what to pay attention to. Test subjects are asked to watch a video of Apollo making a coin disappear while their eye position is measured 500 or 1,000 times a second. Neuroscientists learn that when people are visually tracking movement (like a magician moving a coin) there is more than one type of brain cell involved—one tracks motion and the other suppresses the background scene.