Imagine stepping into a different body, one where your movements feel delayed, and balance becomes a challenging feat. This is the reality many older adults face as their bodies age, and it’s a growing concern that costs Canada over $5 billion annually in fall-related injuries. But what if we could rewrite the rules of how our bodies respond to these changes? Researchers at UBC have developed a groundbreaking ‘body swap’ robot that does just that, offering a unique glimpse into how our brains struggle to keep us upright as we age.
By simulating delayed neural feedback, this life-sized robotic platform has helped scientists uncover why falls become more frequent with age. And here’s where it gets fascinating: the brain treats these delays in sensory feedback almost like it would changes in body mechanics. This discovery could revolutionize how we approach fall prevention for aging populations and those with neurological conditions like multiple sclerosis or diabetic neuropathy.
Maintaining balance might seem effortless, but it’s a complex process. Your brain constantly processes signals from your vision, inner ear, and pressure sensors in your feet to predict movement and correct posture. However, there’s always a slight delay in this process, and as we age or face neurological challenges, these delays worsen, increasing the risk of falls. But here’s the controversial part: while we can’t simply speed up these neural signals, researchers believe we can give the body a mechanical boost to make balance easier for the brain. Could this be the key to reducing falls without directly altering our biology?**
Dr. Jean-Sébastien Blouin, a professor in UBC’s School of Kinesiology, explains, ‘What’s exciting is that our findings suggest we can help in another way, by giving the body a small mechanical boost that makes balance easier for the brain.’ This approach could lead to innovative rehab strategies, assistive technologies, and even improvements in humanoid robot design.
Until now, studying these delays in humans has been tricky. Researchers couldn’t artificially slow nerve signals or modify physical mechanics during standing—until this robotic platform came along. Participants stand on force plates attached to a motorized backboard, which simulates and adjusts forces like inertia, gravity, and viscosity. For instance, increasing inertia makes the body feel heavier, while higher viscosity adds resistance. And this is the part most people miss: negative viscosity has the opposite effect, speeding up a lean as if someone were being pushed. The system can also introduce a 200-millisecond delay between a participant’s movement and their body’s response, creating the sensation of reacting too late.
‘The robot lets us rewrite the rules your body normally plays by,’ says Dr. Blouin. ‘In an instant, you’re moving under a completely different set of physical laws, almost like stepping into a different body.’
In three controlled experiments, researchers found that delayed feedback caused significant instability. Interestingly, changes in inertia and viscosity created a similar feeling of instability, and participants reported both situations felt alike. In the final experiment, when the robot increased inertia and viscosity for participants facing delayed feedback, most regained stability quickly, with sway reducing by up to 80 percent. This raises a thought-provoking question: Could manipulating physical forces be a more effective way to combat balance issues than focusing solely on neural delays?
Looking ahead, the implications are vast. The findings could inspire wearable devices that assist with balance or robotic training systems that help patients adapt to slower neural feedback. The team also expects their work to advance humanoid robot design. The platform will soon move into UBC’s new Gateway Health Building, where research on fall prevention, rehabilitation, and aging will continue.
Published in Science Robotics, this study not only sheds light on the intricate relationship between our brains and bodies but also invites us to rethink how we approach aging and balance. What do you think? Is this mechanical boost the future of fall prevention, or are there ethical concerns we should consider? Share your thoughts in the comments below!
