In this video, Mary B. Quinton describes her concept of midlines and their influence on development. The organization of midlines in vertical, horizontal, and diagonal planes of movement is clearly demonstrated with emphasis on their importance for emerging righting reactions. Emergence of midline organization and righting reactions in the young infant is theorized to inhibit the development of compensatory and abnormal patterns of movement. Activities are demonstrated on a doll for clarity. Provided in MP4 download only.