Parma, March 23, 2026 - Integrating the observation of an action with its execution in virtual reality can significantly improve hand motor recovery in stroke patients. This is the finding of a randomized, controlled clinical trial conducted at the Cardinal Ferrari KOS Center, the Quarenghi Clinical Institute in Bergamo, Italy, and the U.O. of Neuroradiology of the Azienda Ospedaliero-Universitaria in Parma, Italy, in collaboration with the University of Parma. The work has been published in the journal Stroke, one of the leading international journals dedicated to cerebrovascular diseases, and provides new evidence on the effectiveness of rehabilitation protocols that combine neuroscientific approaches and digital technologies, showing how clinically relevant improvements can be achieved even long after stroke.
The study
The research involved 48 patients at the Cardinal Ferrari KOS Center (Parma) and the Quarenghi Clinical Institute (Bergamo) affected by subacute or chronic stroke, with upper limb motor deficits. Participants and in pparticipants were randomly assigned to two groups. The experimental group followed a rehabilitation program combining Action Observation Treatment (AOT) and performance of the same tasks in virtual reality (VR); the control group performed identical exercises in virtual reality but without the action observation phase. The treatment lasted five weeks, with intensive sessions progressively adapted to the motor skills of each and every patient, evaluated for the diagnostic part in the complex structure of Neuroradiology of the Azienda Ospedaliero-Universitaria di Parma.
How the therapy works
The rehabilitation protocol is based on a simple but neuro-scientifically founded mechanism.
- In the first phase, the patient observes short videos showing everyday actions - such as grasping, moving or using objects - without moving the hand. This observation activates the mirror neuron system in the brain, which is involved in motor simulation and movement control, even in the absence of physical execution.
- Subsequently, the patient tries to perform the same action in virtual reality, using his own arm and hand as much as possible. The patient manipulates real objects equipped with sensors, capable of detecting even very small or incomplete movements. Virtual reality amplifies and makes visible these movements, rendering a more fluid and functional action on the screen in front of the patient.
Replicating this process, the brain receives consistent signals between what it sees, what it tries to do, and what it perceives as a result, promoting reorganization of neural networks and progressive recovery of motor control.
Results
Both groups experienced improvement in motor function, but the patients who followed the combined protocol of action observation and virtual reality achieved significantly greater benefits in paretic hand dexterity. The improvement exceeded the threshold of clinical significance and was stable even six months after treatment completion, indicating a lasting effect over time. In addition to manual dexterity, the study shows improvements in muscle strength, reduced spasticity, and increased autonomy in activities of daily living in both groups. A finding of particular interest is the improvement observed also in the nonparaesthetic hand,a finding that suggests a possible bilateral involvement of motor recovery mechanisms. Antonino Errante, principal investigatorof the study, research psychologist at the Department of Medicine and Surgery, University of Parma, explains, "This study shows that action observation, when integrated in a structured way with virtual reality, can significantly enhance hand motor recovery after stroke. The results suggest that the brain retains a remarkable capacity for reorganization even long after the acute event and that circuits involved in observing and performing actions can be effectively reactivated through targeted rehabilitation protocols."
A contribution to post-stroke rehabilitation
Authors and authors point out that the efficacy of the intervention is particularly evident in/on younger patients and those/those treated earlier after stroke, while maintaining benefits even in the later stages. The study reinforces the idea that the combination of neuroscientific approaches and immersive technologies may be a promising strategy for upper limb rehabilitation after stroke. Further studies may further investigate the neurophysiological mechanisms underlying the observed improvements and to evaluate the use of increasingly immersive and adaptive virtual reality systems, with the aim of making rehabilitation increasingly effective, personalized and based on the real mechanisms of brain recovery. "For those undergoing rehabilitation after a stroke, recovering even small gestures of daily life can make a big difference," says Antonio De Tanti, clinical director of the Cardinal Ferrari KOS Center and co-author of the study. "The results show that integrating action observation and virtual reality is not only effective, but can translate into concrete and lasting benefits in clinical practice. Investing in research also in rehabilitation means offering patients real opportunities for recovery and improving the quality of care".
Gian Pietro Salvi, neurologist at the Quarenghi Clinical Institute, co-author of the study:"With enthusiasm we faced this rehabilitation challenge that, thanks to the use of technology, demonstrated significant functional recovery of the upper limb in patients with vascular neurological lesions. This work confirmed that there is still room for therapeutic innovation and better recovery for these people. The patients who participated with dedication in this treatment were extremely satisfied with the work done, as were their caregivers."
