Fig. 16

Anomaly plots from a POUR exercise sequence by a post-stroke subject (from Kinect + IMU system). He cannot extend his wrist to stay in a natural resting position. It causes his hand to always hang underneath the wrist level when he lifts the forearm. He has to compensate by lifting the wrist to about 10–15 cm higher than healthy subjects’ average. When the lift is too high, it is shown in the wrist height reconstruction error (WR Y, black). Phase fluctuations around the phase range of 1.0\(\pi\) to 1.6\(\pi\) that happen in most of his repetitions are caused by a small dip when the hand is above the bucket. By observation, a normal healthy subject usually lifts their hands just high enough to pour into the bucket without the dipping for the hand height adjustment. The long pause around the 500th frame is the moment when the cup is slipping out of his palm and he takes some time to adjust it