Months after I participated in the Dance for PD class, as I was poring over the neuroscience of music, I found myself thinking about that grand right and left—how we greeted one another with handshakes and smiles. Movement is necessary for the most basic forms of self-expression, including speech, facial expressions, and gestures. The body is how we translate what is happening inside us—thoughts, feelings, desires—into something observable that other people can understand.
