Fig. 3.

Limb orientation during study. a Image showing an intact limb subject with their limb in each of the three orientations: − 45°, 0°, and + 45° (left to right respectively); b Image showing the subject’s view during the 3D TAC test. The subject is tasked with moving their virtual arm (blue) to overlap with the target arm (red); c The limb turns green as an indication that the arm is correctly positioned, and the user must hold this position for two seconds