Motor imagery, in which a person practices a physical skill in cognitive form in his/her mind to enhance motor skill performance (Annett et. al., 1995; Jackson et al., 2001). Using mental practice to promote motor skill performance in patients with stroke is reported in many studies (Driskell et al., 1994; Feltz & Landers, 1983). Why does mental practice work? The Simulation Theory that has been presented by Jeannerod (2001), suggests that actions have a covert stage. This covert stage represents the action including the purpose, the information needed to produce it and the possible results. In this theory it is suggested that there is a similarity between the simulated action and executing the action in terms of neural activity and the results
