Study of Cerebral Activation by fNIRS During Vibration-induced Illusion of Movement in Healthy and Stroke Participants.

The purpose of this study is to investigate the cerebral activation of healthy and stroke participants in 4 or 2 different conditions (repeated 2 times) of vibration-induced illusion of movement respectively, resulting in 8 or 4 vibration blocks with 3 vibrations per block. The frequency of the vibration being 80 Hz. Healthy participants: * Right arm, eyes opened * Right arm, eyes closed * Left arm, eyes opened * Left arm, eyes closed Stroke participants: * Deficient side, eyes opened * Deficient side, eyes closed The aim is to compare the subjective sensation of movement score and cerebral activations of healthy/stroke participants depending on the condition.