Imagine being able to feel again. Not just in a philosophical sense, but the actual, physical sensation of touch—the warmth of a mug, the texture of a shirt, the pressure of a handshake. For people with spinal cord injuries, that’s been an impossible dream. Until now.
Researchers at the University of Pittsburgh and the University of Chicago have figured out how to restore the sense of touch using precisely targeted electrical pulses to the brain. Because apparently, that’s where we are now.
They studied five individuals with spinal cord injuries who had special brain-computer interface (BCI) devices implanted. Over a combined 27 years of use, these devices delivered a staggering 168 million electrical pulses to the brain. The best part? No serious side effects. Just a lot of very subtle, very intentional zaps.
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Start Your News DetoxThe Brain's New Language
BCIs are incredible. They essentially translate brain activity into commands, letting people control robotic limbs or computers with their thoughts. But this study flipped the script, sending information into the brain. Specifically, tiny electrical pulses went to the somatosensory cortex—the brain’s VIP lounge for all things touch.
Why is this such a big deal? Because controlling a robotic hand without any feedback is like trying to tie your shoes blindfolded. You rely purely on sight, which requires intense focus. With touch, you instinctively know how much pressure to apply, the grip strength needed, or the texture you’re encountering.
Pitt’s Rehab Neural Engineering Labs and the University of Chicago have been at this for over a decade. Back in 2012, a Pitt team was among the first to implant electrodes that let a paralyzed person control a robotic arm. By 2015, they were stimulating the sensory cortex to add touch. And in 2020, the University of Chicago took it up a notch, implanting electrodes in both the motor and sensory cortex of a participant. Because if you’re going to build a bionic future, you might as well go all in.
The five volunteers in this new study were the long-term heroes, helping answer crucial questions: Does repeated stimulation cause harm? Do these artificial sensations wander around the brain? Do they change over time?
A Decade of Touch, Still Stable
The answers were overwhelmingly positive. Electrical pulses aimed at the hand area of the brain consistently created hand sensations. Years later, those sensations hadn't decided to pack up and move to, say, someone's elbow. They stayed put.
Lingering sensations were also incredibly rare—about once every 23,000 stimulation trials. Most of those faded within ten seconds, and none caused pain or required medical intervention. Your phone charger is probably more temperamental.
The main challenge was that the electrodes’ performance did decline over time. On average, 64% of them were still working. One person had 60% still active after ten years in the brain. Which, if you think about it, is both impressive and slightly terrifying for tiny electronics living inside a skull.
Charles Greenspon, a lead author, noted that this study proves the tech can be a long-term solution. He believes companies can now start developing these devices for home use. So, soon, getting your sense of touch back might be as accessible as ordering a new gadget.
And here’s the kicker: similar microstimulation is also being explored for vision and hearing. So, the same approach that's bringing back touch could one day restore other lost senses. Because apparently, the brain is just waiting for someone to plug in the right wires.
