Humans typically make thousands of movements every day, which allow us to navigate and interact with the world around us. The brain controls the body’s movements and, amazingly, can instruct the body to move in just a split second. Even though the brain can rapidly move the body, most of our movements appear very smooth and efficient. While some movements are easy or automatic, such as blinking our eyes, other movements are more challenging, such as moving the arm to choose between two toys. Scientists know that the brain functions in separate ways for different types of movements. Hidden in our movements, however, lies valuable information that can provide clues about how the brain works. Scientists are using a recent technological advance, called movement tracking, to better understand brain functions such as decision making, attention, and memory.