The idea of complimentary dominance — both hemispheres of the brain contribute to different aspects of movement in both halves of the body — was developed by Professor Robert Sainburg, pictured here, who studied the hypothesis it for decades. Credit: Dennis Maney / Penn State. Creative Commons Since the early 20th century, researchers believed that movements on the right and left sides of the body were controlled by the opposite hemisphere of the brain and that handedness resulted from the dominant side doing a better job at controlling movements. Nearly 30 Read More