Summary: Stroke remains a primary driver of long-term adult disability globally. Even when survivors undergo intensive early-stage physical therapy, immense numbers continue to struggle with permanent upper limb deficits, experiencing a profound loss of hand dexterity, blunted sensory perception, and distorted body ownership.
While standard rehabilitation routines can slowly improve basic muscle mechanics, they almost exclusively prioritize raw movement training. This leaves underlying sensory deficits and altered body awareness virtually unaddressed, leaving a critical structural gap in comprehensive neuro-rehabilitation strategy.
To close this therapeutic gap, an international engineering coalition developed MultiSensy, a personalized rehabilitation platform that seamlessly merges immersive virtual reality (VR) with real-time transcutaneous electrical nerve stimulation (TENS). Rather than treating movement in a vacuum, MultiSensy pairs targeted digital tasks (such as reaching, grasping, and pinching) with synchronized skin electrodes that physically recreate the tactile sensation of touching virtual objects.
Key Facts
- The Hybrid MultiSensy Array: MultiSensy combines an immersive, task-based VR environment with real-time skin electrodes that stimulate peripheral nerves, enabling stroke survivors to physically feel the shape, position, and texture of virtual digital objects.
- Doubling Motor Recovery Rate: On the Fugl-Meyer Assessment (FMA-UE)—the global clinical gold standard for measuring post-stroke upper limb motor recovery—the MultiSensy group demonstrated nearly twice the structural improvement seen in the conventional control group.
- Everyday Functional Gains: Participants using the sensory-VR platform achieved massive functional leaps on the Action Research Arm Test (ARAT), proving that the combined training transfers directly into everyday life activities like forearm rotation and pinching.
- Healing Altered Body Somatognosis: Beyond restoring motor control, the real-time electrical feedback successfully repaired touch deficits and reduced body schema distortions, such as patients perceiving their paralyzed arm as warped in size, shape, or space.
- Continuous Kinematic Data Logging: The MultiSensy platform functions as an active diagnostic tool, continuously harvesting precise movement and trajectory data during gameplay to supply clinicians with automated, objective indicators of recovery.
- Chronic-Phase Efficacy: The clinical trial confirms that sensory-motor integration can successfully trigger neuroplastic recovery in chronic stroke patients long after the acute event (greater than three months post-stroke), clearing a pathway for future home-based, decentralized therapy.
Source: University of Vienna
Stroke is one of the leading causes of long-term disability worldwide. Even after intensive early physiotherapy, many stroke survivors continue to live with reduced arm and hand function, impaired sensation and altered body awareness long after the initial event.
While conventional rehabilitation can improve motor functions, it often focuses primarily on movement training, instead sensory deficits and body awareness are frequently given insufficient attention. There is therefore a need for more comprehensive rehabilitation strategies.
Personalised training in a virtual environment
To address this need, a research team led by Stanisa Raspopovic (Center for Medical Physics and Biomedical Engineering, MedUni Vienna) has developed “MultiSensy”, a rehabilitation platform for patients with arm and hand impairments following a stroke, which combines immersive virtual reality with transcutaneous electrical nerve stimulation. The system turns rehabilitation exercises into interactive virtual tasks designed to train specific arm and hand functions, including reaching, grasping, pinching, and forearm rotation.
At the same time, electrodes attached to their skin stimulate the nerves in real time, allowing participants to feel virtual objects as if they were physically touching them. Inspired by occupational therapy principles, the games can be adapted to each participant’s impairment level, allowing training to be both targeted and engaging.
“Our aim was to go beyond mere movement training,” says study leader Stanisa Raspopovic. “After a stroke, patients often have difficulty not only moving the affected limb, but also feeling it and perceiving it correctly. MultiSensy was developed to reconnect movement, sensation and body awareness during rehabilitation.”
The system was tested on 34 patients who had suffered a stroke more than three months before the study. Some participants trained using MultiSensy: they wore VR goggles and performed arm and hand exercises in a digital training environment designed to simulate everyday tasks. The control group received conventional rehabilitation, including physiotherapy and occupational therapy. Both groups completed a three-week rehabilitation protocol consisting of twelve training sessions. The clinical examinations were supported by a team from the Faculty of Medicine in Belgrade.
Improvements in function and body perception
The study showed greater improvements in arm and hand recovery in participants treated with MultiSensy than in those receiving conventional rehabilitation. In the Fugl-Meyer Assessment for the upper limb, a standard measure of motor impairment after stroke, the MultiSensy group showed nearly twice the improvement observed in the control group. Similar benefits were also seen in the Action Research Arm Test, which evaluates how well patients can use their arm and hand in everyday functional tasks. But motor disability is just a part of the problem.
“After a stroke, some patients struggle to feel touch in their affected hand and may even perceive the arm as distorted in size, shape, or position. Participants treated with the new system showed improvements in their sense of touch and in perception of their affected arm,” adds lead author Valerio Aurucci (ETH Zurich).
Furthermore, the platform collects movement data during training, providing objective indicators of rehabilitation progress. This allows patients’ performance and recovery to be monitored over time, helping clinicians to assess progress more precisely and adapt therapy for each individual.
“The results provide early clinical evidence that immersive virtual reality combined with sensory nerve stimulation can support recovery after stroke, even after months from the event”, says Stanisa Raspopovic.
“The technology is still at the research stage, and larger clinical trials are needed to confirm its benefits. However, the study opens a promising perspective for future personalised and potentially home-based stroke rehabilitation.”
Key Questions Answered:
A: When a stroke damages the brain’s motor networks, it doesn’t just interrupt the signals going out to the muscles; it also breaks the sensory pathways coming back in. Traditional therapy focuses on moving the limb, but without sensory feedback, the brain struggles to map out and rewire the damaged circuits. MultiSensy fixes this by closing the sensory-motor loop. When a patient reaches out in VR and grabs a digital cup, electrodes instantly stimulate their skin nerves to mimic the physical touch. This combined blast of visual intent and tactile reality forces the brain’s remaining pathways to undergo accelerated neuroplasticity, effectively doubling the speed of motor recovery.
A: Following a stroke, the brain can lose its internal map of the body, a condition known as distorted body somatognosis. Because the brain is no longer receiving healthy baseline signals from the affected limb, patients often perceive their arm as a dead weight, or even visualize it as warped, swollen, or structurally altered in size and position. By immersing patients in a virtual environment where they see a healthy digital arm moving perfectly in tandem with their real-world attempts, while simultaneously feeling accurate touch bursts, MultiSensy anchors the brain back to reality. This multi-sensory synchronization recalibrates the brain’s internal map, restoring an accurate sense of touch and limb ownership.
A: Currently, MultiSensy is still in its advanced research and clinical validation phase, meaning it isn’t quite ready for commercial purchase or deployment in home kitchens. While this initial 34-patient clinical trial delivered phenomenal proof-of-concept evidence, larger and more diverse clinical trials are required to fully clear safety and regulatory hurdles. However, because the system relies on portable VR headsets and standard transcutaneous skin electrodes rather than massive, hospital-locked robotic exoskeletons, the ultimate goal of the research team is to scale this into an affordable, home-based, personalized telerehabilitation system.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this stroke and neurotech research news
Author: Karin Kirschbichler
Source: University of Vienna
Contact: Karin Kirschbichler – University of Vienna
Image: The image is credited to Neuroscience News
Original Research: Open access.
“Immersive virtual reality with synchronous neurostimulation for upper-limb recovery after stroke: a randomized feasibility trial” by Giuseppe Valerio Aurucci, Olivera Djordjevic, Andrea Cimolato, Natalija Secerovic, Tijana Dimkic Tomic, Maria Dolores Ardura Carnicero, Haotian Yao, Ljubica Konstantinovic & Stanisa Raspopovic. Nature Medicine
DOI:10.1038/s41591-026-04486-4
Abstract
Immersive virtual reality with synchronous neurostimulation for upper-limb recovery after stroke: a randomized feasibility trial
Stroke affects 15 million people annually and leaves 5 million permanently disabled. In the chronic phase (>3 months after stroke), patients often experience persistent sensorimotor deficits and altered body representation, yet rehabilitation delivery remains partial and inconsistent, highlighting an unmet clinical need. Immersive technologies and noninvasive neurostimulation offer potential for scalable, intensive rehabilitation, but clinical evidence supporting multimodal approaches and objective outcome assessments remains limited.
In this study, we evaluate the feasibility, clinical efficacy and assessment capabilities of a multimodal platform (MultiSensy) integrating virtual reality with synchronous transcutaneous sensory neurostimulation. Thirty-four patients with chronic stroke were enrolled in a combined pilot study (n = 9) and randomized, 33-day-long feasibility study (n = 25), where MultiSensy intervention was evaluated against conventional rehabilitation.
Primary endpoints included motor function assessed by Fugl-Meyer Assessment Upper Extremity (FMA-UE) and Action Research Arm Test (ARAT) and self-body representation assessed by the Body Landmark Test. Secondary outcomes included sensory and functional independence evaluation. Continuous kinematic data were collected to derive objective performance markers.
Compared to conventional rehabilitation, MultiSensy resulted in greater motor improvement, reflected by higher FMA-UE (13.17 ± 1.30 versus 7.54 ± 1.48; P = 0.01) and ARAT (8.25 ± 1.96 versus 2.44 ± 1.08; P = 0.029) scores. MultiSensy further improved body self-representation and hand tactile acuity.
The platform enabled continuous performance monitoring and extraction of objective kinematic markers that tracked rehabilitation progress. These findings pave the way for larger trials and highlight the potential treatment of multiple patients with fewer physiotherapist visits needed or even home-based sensorimotor rehabilitation.
ClinicalTrials.gov identifier: NCT06400823.
