Figure 2: Hand and ball path traces from exemplar participants, for Level 1. A) Traces from a 72 year old control participant. Solid black lines represent hand path of each hand and dotted line represents the path of the ball. At this level, the ball is coupled to the hand path as it is fixed to the bar linking both hands (i.e., ball represents the mid-point of the distance between both hands). Note: traces would normally overlap but are separated for illustrative purposes. Far right plots represent hand speed for the left and right hands overlaid for multiple reaches to each target. Dotted line represents the time point when the target was illuminated. B) Traces from a left-affected stroke participant (68 years old) with a lesion in the right middle cerebral artery (MCA) assessed 26 days post-stroke. This participant scored 7/7 for left (affected) arm CMSA and 4/7 for right (unaffected) arm CMSA. C) Traces from a right-affected stroke participant (78 years old) with a lesion in the left MCA assessed 12 days post-stroke. This participant scored 2/7 for right (affected) arm CMSA and 6/7 for left (unaffected) arm CMSA.