Fig 3. The criteria for angles and the direction of angular variation.

a: Head inclination angle, between the vertical line and the line through the tragus of the ear and outer eye canthus. b: Neck inclination angle formed between the vertical line and the line through C7 and the tragus. c: Acromial tilt angle formed between the horizontal line and the line through both acromion processes. d: Head lateral inclination angle formed between the vertical line and the line through the glabella and the top of the chin. e: Neck lateral inclination angle formed between the vertical line and the line through the top of the chin and the superior margin of the sternum. The variation through the tasks was represented as postactive posture angle–preactive posture angle. This figure is an example of right hemiplegia.