Understanding the way the brain represents extrinsic and intrinsic actions, and the relationship between the two, has been of great interest to researchers who seek to understand motor control and motor learning -- or, put simply, how we learn to move. Researchers have now laid out a generalizable theory about how the brain encodes such motor memories. They showed that units of motor memory are not so binary after all, but instead a mixture of both the intrinsic and the extrinsic.