Brain Implants Are Here — And Getting Better

Brain-computer interfaces https://www.npr.org/2011/05/12/135598390/mind-reading-technology-turns-thought-into-action (BCIs) are surgically implanted devices that link the brain to a computer. They can be helpful for people who’ve lost the ability to move or speak. And they’re making progress. New generations of BCIs could go as far as to detect a person’s inner monologue. But that progress is raising questions about the future privacy of our brains, and has some scientists asking, “What happens when you want to keep some things to yourself?” NPR brain correspondent Jon Hamilton https://www.npr.org/people/2100615/jon-hamilton talks to Short Wave’s Emily Kwong about the future of BCIs. Read more https://www.npr.org/sections/shots-health-news/2025/08/20/nx-s1-5506334/brain-computer-implant-speak-inner-speech-mind of Jon’s reporting on brain implants. Interested in more on the future of brain science? Email us your question at [email protected] mailto:[email protected] – we may feature it in an upcoming episode! Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave http://plus.npr.org/shortwave. See pcm.adswizz.com https://pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. NPR Privacy Policy https://www.npr.org/about-npr/179878450/privacy-policy

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• 0:00Speaker 00

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• 0:19Emily Kwong?

  You're listening to Short Wave from NPR.

• 0:24Emily Kwong?

  Hey, Short Wavers, Emily Kwong here. If you're listening to this, you know this podcast has to travel through your ears to get to your brain. But why not take a more direct route? Say, from the internet, straight to your neurons? That's basically what we're talking about today. Brain-computer interfaces with NPR's own neuromancer, John Hamilton. Hi, John.

• 0:43Speaker 02

  Hey, Emily. Happy to be part of today's consensual hallucination, as William Gibson would put it. And with that, I guess we should probably stop with the dystopian sci-fi references.

• 0:53Emily Kwong?

  Let's keep them coming, John. I mean, Elon Musk is out here talking about using a brain-computer interface, a BCI, to connect us all to cyberspace, right?

• 1:01Speaker 02

  I mean, he has mentioned that. And his company, Neuralink, has surgically implanted its brain-computer interfaces, which we will call BCIs for short, in a whole bunch of people. Oh, and the Neuralink device? It's called telepathy.

• 1:16Emily Kwong?

  So I'm right. The future is here.

• 1:19Speaker 02

  You are certainly right about what one tech billionaire is saying. But I am here to tell you that these interfaces are still a long way from putting our brain cells online. What they can do is pretty amazing. They can turn a person's thoughts into words or movement. And places like Neuralink clearly hope they're going to do a lot more. So check out this promotional clip from Neuralink.

• 1:40Speaker 03

  Imagine the joy of connecting with your loved ones, browsing the web, or even playing games using only your thoughts. This is made possible by placing a small, cosmetically invisible implant in a part of your brain that plans movement.

• 1:55Emily Kwong?

  No, no, I'm not ready to enter the matrix, John.

• 1:58Speaker 02

  Not to worry, Emily. Right now, brain-computer interfaces are still experimental. They're really only for people who are living with paralysis. Plus, Neuralink is really just one of the companies in this space. And some of their competitors are actually probably ahead.

• 2:15Speaker 02

  And the other places are much less focused on, shall we say, joining the singularity.

• 2:20Emily Kwong?

  Well, today on the show, what brain-computer interfaces can and cannot do.

• 2:25Speaker 02

  And why they're only a little bit scary, at least for now.

• 2:29Emily Kwong?

  You're listening to Short Wave, the science podcast from NPR.

• 2:42Emily Kwong?

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• 4:07Emily Kwong?

  Okay, so John, I'm really curious about what we're going to discuss today, brain-computer interfaces. What does that mean?

• 4:15Speaker 02

  Yeah, okay, the term refers to technology that can detect and translate the electrical signals that are coming from your brain. Some of these devices can also send electrical signals to your brain.

• 4:28Emily Kwong?

  Wow.

• 4:29Speaker 02

  There are a few consumer products that are worn like a cap or a headset and detect brain activity from outside the skull. We're not going to talk about those. They're not that great. Some of them may help you meditate, but that's unclear. The devices we're going to be talking about are the ones that are implanted inside the skull, which is a much better place to listen to the brain's electrical activity. Some of these devices are put on the surface of the brain, and other ones, like the Neuralink device, they actually thread electrodes into the brain itself.

• 5:01Emily Kwong?

  But why would someone want something inside their skull listening to their brain?

• 5:06Speaker 02

  So to answer that, I'm going to go all the way back to 2004. One of the first people to ever get a BCI was a guy named Matt Nagel. He's a young man who got stabbed in the neck sadly and was left paralyzed. So he couldn't move his arms or legs. A team of scientists asked him if he wanted to try a device that was then called BrainGate. The idea was this might let him move a computer cursor using just his thoughts. I managed to find this old video of him testing that BCI with a researcher named Abe Kaplan.

• 5:37Speaker 04

  What are you going to do first?

• 5:39Speaker 02

  So keep in mind, this is all 20 some years ago.

• 5:42Speaker 05

  I'm going to open my email first.

• 5:44Speaker 04

  Okay.

• 5:47Speaker 05

  I'm going to open the first one.

• 5:49Speaker 04

  You're going to open the first one.

• 5:52Emily Kwong?

  Was that the sound of the email opening, the ching?

• 5:54Speaker 02

  Totally, yeah. He was able to do things that he had no ability to do with his body, but he could do with his brain.

• 6:01Emily Kwong?

  That sounds like life-changing technology. That's pretty amazing. Okay, so this was in 2004. Has the technology advanced since then?

• 6:11Speaker 02

  In a lot of ways, yes, that Braingate device that Matt Nagel used required actual wires to go through his skull. Nowadays, devices are moving to wireless communication. They also use many more electrodes, so they can listen to the electrical activity of more neurons. That makes them more accurate. And the latest devices can do a lot more than just, you know, move a computer cursor. They can let a person who is paralyzed control a robotic arm accurately enough to sip from a cup of water.

• 6:40Emily Kwong?

  Whoa.

• 6:41Speaker 02

  Some can even provide that person with a sense of touch by sending signals from a robotic hand back to the brain. And BCI's can even decode speech signals in the brain, which means a person who can no longer talk because of a stroke or a disease like ALS, they can now communicate.

• 6:59Emily Kwong?

  That's, I've fully come around to this. This is amazing. That, so you're saying someone who can't control their own vocal tract can speak again with this assistance?

• 7:10Speaker 02

  Pretty much. The, the BCI detects the words that a person wants to say, and then it uses the computer to do the speaking. A lot of the work on speech BCI's has been done in California, including at the University of California Davis. Let me play you a recording from UC Davis. This is of a man named Casey Harrell. He has ALS and can no longer physically produce words, but he can speak through a BCI that creates an artificial voice. Hi. Yeah.

• 7:41Emily Kwong?

  I mean, it's not super fast, but it's totally understandable. And this is coming from his thoughts?

• 7:49Speaker 02

  More or less. This particular BCI, it relies on signals from the motor cortex in the brain. So the part of the brain that usually tells the muscles that are involved in speech what to do.

• 8:01Emily Kwong?

  Oh, so the, the neurons used for signaling like your voice box, your throat, your mouth, that's what? The BCI is tapping into.

• 8:08Speaker 02

  Exactly. So when someone attempts to speak, the brain starts sending those signals and the BCI is able to turn those signals into words. This is something that several companies, including Neuralink, have included in their BCI's. But of course, it's all experimental. You know, we've had 20 plus years after the first BCI worked in a person, and there are still no FDA-approved brain-computer interfaces that are on the market.

• 8:33Emily Kwong?

  I'm surprised by that. Why hasn't the FDA approved any BCI's?

• 8:37Speaker 02

  Well, they haven't really had any submitted. And I talked about the reason for that with Dr. Lee Hochberg. He's one of the scientists who've been in the BCI game since, you know, the beginning. Lee was one of the scientists who created the Brain Gate device we heard Matt Nagel using a few minutes ago. I don't quite know how to summarize his resume, so I'm just gonna play you what he said when I asked him to list all of his credentials.

• 9:03Speaker 06

  I'm a critically care neurologist and vascular neurologist at Massachusetts General Hospital. I'm also a professor of engineering at Brown University and a neurologist and researcher at the Providence VA Medical Center. In addition, I direct the Center for Neurotechnology and Neurorecovery at Mass General, and I'm one of the co-organizers for the Implantable Brain-Computer Interface Collaborative Community.

• 9:27Emily Kwong?

  This sounds like a Hollywood job, but it's real.

• 9:30Speaker 02

  It's a real job. You get the idea. He's got a lot of credentials.

• 9:33Emily Kwong?

  Yeah. So what did Lee have to say about where we're at with BCI's? Which sounds like not as far as we could be.

• 9:40Speaker 02

  One thing he said was he never thought BCI's would take so long to become a commercial product. But he also talked about some of the reasons why it has taken so long. It turns out it's really hard to take something that works in the lab, you know, with lots of computers and wires and technicians, and turn that into something that functions reliably for years inside a person's skull and can also communicate with their smartphone.

• 10:03Emily Kwong?

  I can't imagine why. Making this like portable, reliable forever sounds easy. No, not at all.

• 10:09Speaker 02

  There are a few steps in there, right? And then there's the whole FDA approval process.

• 10:14Emily Kwong?

  Sure.

• 10:14Speaker 02

  It's slow, especially when you're dealing with technology like this that's completely new. And one more thing is that these devices are expensive. So companies that make them have to be thinking about whether they'll be covered by a person's health insurance. You know, despite all those things, Lee told me the industry is really finally close to getting actual products on the market.

• 10:36Emily Kwong?

  Wow.

• 10:37Speaker 06

  I hope it's just in a few years that if I see and I'm taking care of somebody in the neuro ICU who suddenly lost the ability to move or lost the ability to speak, what I want to say is I'm sorry this happened, but we have a technology that can restore your communication tomorrow. And really mean that if that conversation is happening on a Wednesday, that the technology will be deployed on Thursday and working.

• 11:01Emily Kwong?

  You're saying this this could be the reality for some patients, like when?

• 11:06Speaker 02

  It could be just a few years. I mean, brain-computer interfaces have been tested in dozens of patients now. There are at least half a dozen well-financed companies that are working on this technology.

• 11:16Emily Kwong?

  Wow.

• 11:16Speaker 02

  And you've got artificial intelligence, which is making it much faster and easier to decode a person's brain signals. On the other hand, all that progress is raising some questions about what you might call brain privacy.

• 11:30Emily Kwong?

  This has been my lingering fear this whole time. Like, I want to be into this, but I'm worried about the the intrusion of this technology. I mean, devices that read our thoughts and use that information, are we ready for that?

• 11:45Speaker 02

  Well, that was exactly the question that some researchers had. They did a study that looked at this issue in BCI's that decode speech. But remember how those devices initially relied on a person trying to get their vocal apparatus to actually form a word?

• 11:59Emily Kwong?

  Uh huh.

• 12:00Speaker 02

  There's a new generation of devices that kind of goes the next step. It can actually detect a person's inner monologue. You know, that voice in your head that says things like, is this meeting ever going to be over?

• 12:11Emily Kwong?

  I don't have an inner monologue.

• 12:12Speaker 02

  Not everybody has an inner monologue. This is this is something that it doesn't work for everybody.

• 12:18Emily Kwong?

  I'm safe.

• 12:19Speaker 02

  Yeah, exactly. But if you do have one, it's the easiest way to get sort of fluent speech out of a brain-computer interface.

• 12:26Emily Kwong?

  Whoa.

• 12:28Speaker 02

  So what the authors found was there are ways to let people who are using a speech BCI switch off that inner monologue function, you know? But still, it's a little Disturbing. And one of the people who's worried about this is Nita Farahani. She's a professor of law and philosophy at Duke. She wrote a book called The Battle for Your Brain that talks about BCI's a lot. Nita told me she's all for better brain interfaces that will help people who are paralyzed.

• 12:55Emily Kwong?

  Yeah.

• 12:55Speaker 02

  But she says things could get kind of weird when some of these functions come to consumer devices, like, say, a headset that lets you play a video game or post on social media using just your thoughts.

• 13:06Speaker 05

  The more we push this research forward, the more transparent our brains become. And that's a double edged sword. And we have to recognize that this era of brain transparency really is an entirely new frontier for us that we haven't even begun to grapple with.

• 13:20Emily Kwong?

  Yeah, I mean, brain transparency, brain privacy. This all sounds like where we started. Dystopian sci fi, except it's real.

• 13:33Speaker 02

  It totally does. And that is why Farahani and a lot of the scientists who actually work on BCI's, they're trying to ensure that, say, a marketing company can't just eavesdrop on our thoughts.

• 13:45Emily Kwong?

  Yeah, if I get ads delivered to my brain, I'm going to be mad.

• 13:49Speaker 02

  You and everybody else, but don't think there isn't somebody thinking about it.

• 13:52Emily Kwong?

  I won't think anything. I'm going to keep this non-monologue on lock. Thank you so much, John Hamilton. It's great to have you on Short Wave.

• 14:00Speaker 02

  Always a pleasure, Emily.

• 14:05Emily Kwong?

  This episode was produced by Rachel Carlson. It was edited by Rebecca Ramirez and Burleigh McCoy, and it was fact checked by Tyler Jones. Kwesi Lee was the audio engineer. Beth Donovan is our senior director, and Colin Campbell is our senior vice president of podcasting strategy. I'm Emily Kwong. Thank you for listening to Short Wave from NPR.

• 14:36Emily Kwong?

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