After an injury, thanks to the mechanism of plasticity, the reorganization of sensory and motor systems occurs at multiple levels including the spinal cord, brainstem, thalamus and cortex (Chen, Cohen & Hallett, 2002) . Furthermore, if the injury occurs at a young age, the reorganization is even more extensive and leads to a better recovery. Neuroplasticity and neurogenesis can still occur in adults, but they are less efficient and faster than in children. What happens after a hemispherectomy dramatically demonstrates the brain's ability to resist extensive damage (Villablanca & Hovda, 2000). For example, “when an entire cerebral hemisphere is removed immediately after birth in cats, the rest of the brain continues to grow and, in adulthood, the animals appear no different from normal littermates” (Villablanca & Hovda, 2000). Many experiments have been conducted to better understand the consequences of hemispherectomies on the functional structure of the brain. Holloway, Gadian, Vargha-Khadem, Porter, Boyd, and Connelly (2000) studied the sensorimotor functions of the hemiplegic hand after hemispherectomy, and the results demonstrated that all patients with congenital disease had residual sensory function in the hand contralateral to the hemispherectomized hand. side, while half of the patients had residual motor functions. In patients with acquired disease, 66% had residual sensory function while none