Figure 9

Presentation of extremity throughout the drinking task. Elbow movements are incremental. Finger flexion and wrist rotation are continuous. Shoulder acceleration is only during motion. Class 1 – Elbow Extension. Class 2 – Elbow Flexion. Class 3 – Hand Open. Class 4 – Pronation. Class 5 – Supination. Unshaded – Volitional. (A) Subject 1. (B) Subject 2. (C) Subject 3. (D) Subject 4. (E) Subject 5. Each phase of the task is labeled in the respective regions.