C. KINARM Robot: Sensorimotor function. The KINARM exoskeleton (Kinesiological Instrument for Normal and Altered Reaching Movement) modified for children will assess limb movements at the shoulder and elbow. A standardized, validated assessment of sensorimotor function will include three tasks: position sense via a position matching task, kinesthesia, and visually guided reaching. The investigators have demonstrated the ability of these assessments to demonstrate specific elements of disordered sensorimotor function (50 perinatal stroke, 150 healthy children) including outcomes of position sense, kinesthesia, and motor dysfunction of the "unaffected" limb. Primary outcomes will be position sense during a position-matching task and bilateral motor impairment using a visually guided reaching task. The investigators have just installed a dedicated pediatric KINARM at the Alberta Children's Hospital where all Alberta subjects will attend.