During the experiment, patients in the RFVE training group (Reinforced Feedback in Virtual Environment) will receive 1 hour of virtual reality-based therapy by means of RFVE and 1 hour of TNR treatment (Traditional Neuromotor Rehabilitation). Both treatments will last 1 hour a day, five days weekly for four weeks. The treatment is focused on motor function impairment of the upper extremity.

The TNR training group (Traditional Neuromotor Rehabilitation) patients will be treated totally for two hours daily by means of a TNR programme. The treatment will last 4 weeks.

The patients allocated to RFVE group, will be treated using the "Virtual Reality Rehabilitation System" (VRRS). During the virtual therapy the subject will be seated in front of the wall screen grasping a sensorized real object with the affected hand. If the grasp is not possible the sensors will be fixed on a glove worn by the patient. The real object held by the subject, equipped with electromagnetic sensors, is matched to the virtual handling object. Thereafter, the patient moved the real object (e.g. ball) following the trajectory of the corresponding virtual object displayed on the computer screen in accordance with the requested virtual task.

Applied at the beginning and at the end of treatment 4 weeks thereafter.

Assessed at the beginning and at the end of treatment 4 weeks thereafter.

Assessed at the beginning and at the end of treatment 4 weeks thereafter.

Assessed at the beginning and at the end of the treatment, 4 weeks thereafter.

Assessed at the beginning and at the end of the treatment, 4 weeks thereafter. The scale consist of evaluation of 5 muscles; pectoralis major, biceps, wrist flexors, flexor digitorum superficialis, flexor digitorum profundus.