Patients will undergo goal-oriented movements for upper-limb rehabilitation in a VR scenario. While performing the movement, patients will receive synchronous electrical stimulation targeting the medial nerve. The provided sensation will stimulate the interaction with elements in the virtual world.

The intervention phase will last 3 weeks. Patients will undergo a minimum of three sessions per week (of around 60'). During each of these sessions, the first 10' will be employed for the calibration of the Transcutaneous Electrical Nerve Stimulation (TENS). In the remaining part of the session, subjects will perform some of the VR-based task-oriented games targeting different components.

Patients in the control group will perform physical conventional rehabilitation provided by the rehabilitation clinic.

The total amount of therapy will be the same as that of the VR+TENS group. The exercises will target the same components of the VR+TENS arm.

During the invention, patients will be in VR scenarios and play task-oriented games, interacting with elements that appear in the virtual world, to improve mobility and functional independence of the upper limbs.

The task-oriented games will target different components depending on the disability of the patient.

To assess the sensorimotor impairment in individuals who have had a stroke the investigators will use Fugl-Meyer for upper extremity (FMUE). FMUE assesses reflex activity, movement control, muscle strength, and sensory performances. It comprises items scored on a scale of 0 to 2, where 0 = cannot perform, 1 = performs partially and 2 = performs fully.

To assess functional performance of the upper extremity through observational means the investigators will use the Action Research Arm Test (ARAT). The ARAT is a 19-item measure divided into 4 sub-tests (grasp, grip, pinch, and gross arm movement). The total score goes from 0 to 57. Performance on each item is rated on a 4-point ordinal scale ranging from: 3) Performs test normally 2) Completes test, but takes abnormally long or has great difficulty 1) Performs test partially 0) Can perform no part of test.

To measure the body representation of the subjects the investigators will use body-landmark metrics. In VR, the subject is asked to locate the position of specific body landmarks (e.g. elbow, inner wrist, outer wrist, index, ring) while a black panel is on top of his/her arm. The investigators will then compare the real and perceived dimensions of patients' arms and hands

To assess the degree of assistance required by an individual on ten mobility and self-care the investigators will use the Barthel Index. The score goes from 0 to 100. It consists of an ordinal scale which measures a person's ability to complete activities of daily living (ADL).

To screen cognitive abilities and to detect mild cognitive dysfunction the investigators will use Montreal Cognitive Assessment (MoCA). The MoCA test is a one-page, 30-point test (score from 0 to 30) that can be administered in 10 minutes, assessing short-term memory recall, executive functions, concentration, attention, working memory and language.