PRIMARY_TRACK track
Arms posture.AA sym
Symmetrical arms posture. When both arms are in resting configuration, the symmetrical quality of the alignment is coded from the anatomical reference point (vertical axis). This category excludes the particular hand shape, and includes the shoulders and elbows. The onset is the starting point where both arms are symmetrically aligned. The offset is the time-point when due to an arm or shoulder movement (action or postural shift) the alignment is no longer symmetrical.