The use of sensory information is mandatory for motor learning [1]. Contemporary technologies allow providing complementary information that are both precise and objective on the mechanical consequences of the human actions (“extrinsic”, “augmented” or “enriched” feedback). The addition of articicial feedback in a sensorimotor interaction has two fundamental aims: to inform about the result of the action (success or failure: knowledge of results, KR) and/or about the quality of movement execution (knowledge of performance, KP)[2]. KR feedback act as positive or negative reinforcement for action while KP feedback allow to use alternative sensory pathways (tactile, visual or auditive) to inform about the parameter of the ongoing movement (for example : smoothness, coordination, équilibrium) that may not be directly perceptible, particularly in case of motor or sensory impairment. However, their use is relatively little documented for rehabilitation [3].
