Fig. 1

Marker set up, events and normalized phases of the Finger-to-Nose test. A) The unfilled marker was positioned on the dorsal side of the head, and the markers with a center dot were positioned on the trunk. Three markers (placed on nose, right and left medial epicondyles) were removed after recording a static trial for modelling purpose. Left hand shows the start position (Knee touch) and right hand shows the end position (Nose touch) for the pointing phase. B) Normalized phases of the Finger-to-Nose-Test based on the time derivative of distance (a negative value denotes that the finger moves towards the nose, and a positive value denotes that the finger moves from the nose). Note that the end of the pointing phase is also the event ‘Nose touch’. Likewise, the end of the return phase is when the hand reaches the knee, for the event ‘Knee Touch’. For detailed definitions of the events a–d, see Methods