Fig. 4

Stabilisation and motion frame with aspects that are measured indicated. Key to Fig. 4: 1. Height of motion frame, 2. Height of stool, 3. Position of stool base, 4. Position of stool base, 5. Horizontal distance of face-rest, 6. Distance from motion-frame to face-rest, 7. Position of participant’s face on face-rest 8. Height of face-rest