For people with severe paralysis, getting around independently can be one of the biggest daily challenges. Researchers at the University of Texas at Austin have shown that people with paralysis can learn to steer a wheelchair through a cluttered space using only their thoughts, without any brain surgery.
Brain-computer interfaces, explained
A brain-computer interface (BCI) reads signals from the brain and turns them into commands for a machine, such as a computer cursor, a robotic arm or a wheelchair. Many of the most advanced systems require surgery to place electrodes on or in the brain. That gives clear signals, but it carries surgical risks and isn’t an option for everyone.
The UT Austin team took a non-invasive route. Participants wore a cap fitted with electrodes that pick up the brain’s electrical activity through the scalp, a technique known as EEG.
How the wheelchair worked
The study, published in the journal iScience in 2022, involved three people with tetraplegia, meaning paralysis affecting all four limbs. To steer, they imagined moving parts of their body they could no longer control:
- Imagining moving both hands turned the wheelchair left.
- Imagining moving both feet turned it right.
The system translated those patterns of brain activity into commands for the wheelchair’s motors, speeding up one wheel relative to the other to make it turn.
Non-invasive systems like this involve trade-offs. Signals picked up through the skull are weaker and noisier than signals from implanted electrodes, which is why training and smart software matter so much. On the other hand, a cap can be put on and taken off, with no surgery or recovery time.
Training made the difference
Participants trained three times a week for two to five months. Two of the three improved dramatically. At the start, their accuracy in giving the right commands was roughly 43% to 55%. By the end, it had climbed to about 95% and 98%, and both could guide the wheelchair through an obstacle course. The third participant made less progress.
The researchers say the key lesson is that with enough training, people can learn to control a sophisticated device like this without having anything implanted in the brain.
Still a long road to everyday use
Outside experts called the results among the most successful so far for a non-invasive approach. They also cautioned that the system isn’t ready for daily life. The training is intensive, the setup is complex, and a version that people could easily use on their own at home still needs to be developed. Larger studies with more participants are the next step.
What this means for people living with paralysis
- Ask about current assistive technology. Options such as sip-and-puff controls, head arrays, eye-tracking and voice control are available today and can be tailored to individual needs.
- Work with a rehabilitation team. Occupational therapists and assistive technology specialists can help match equipment to your abilities and goals.
- Consider clinical trials. Research centers sometimes recruit participants for studies of new technologies. A rehab specialist can help you find reputable trials.
- Connect with support organizations. Groups focused on spinal cord injury and paralysis offer resources, peer support and information on emerging technology.
The bottom line
People with paralysis learned to steer a wheelchair with their thoughts, using a simple electrode cap instead of surgery. The technology isn’t ready for everyday use yet, but it shows what training and non-invasive brain-computer interfaces may achieve in the future.
This article is for general information and isn’t medical advice. Talk with your healthcare provider about your individual needs.
