Telepathy is, until proven otherwise, still science fiction. But a new wearable announced this week aims to bring the world closer to silent communication, though it’s more about using brain signals than the X-Men superpower.
Alterego, developed by the MIT Media Lab, is a peripheral neural interface that allows us to converse with machines, artificial intelligence assistants and humans, without using our voice or externally observable movements.
We first saw the Alterego as a prototype in 2018. It was a wearable that strapped onto your face from your ear to your chin. Since then, it’s become significantly smaller and gained more capabilities.
The device works by detecting signals the brain sends out before you speak aloud. Powered by a technology called Silent Sense, the new wearable can detect the full spectrum of speech by its wearer, including when mouthing words or intending to speak. Alterego’s generative artificial intelligence then responds, and those communications are sent to the user via a bone-conduction speaker.
While it can’t capture thought, the company describes Alterego as “the world’s first near-telepathic wearable that enables silent communication at the speed of thought.” It’s not telepathy, but by interpreting your inner voice, it’s a step toward speech without speaking.
Introducing Alterego: the world’s first near-telepathic wearable that enables silent communication at the speed of thought.
Alterego makes AI an extension of the human mind.
We’ve made several breakthroughs since our work started at MIT.
We’re announcing those today. pic.twitter.com/KX5mxUIBAk— alterego (@alterego_io) September 8, 2025
Alterego has an embedded camera system that will allow you to point to something you see and ask about it silently. In a demonstration video, CEO Arnav Kapur circles the face of a character on a postcard, asks who it is (without speaking) and receives a response with the character’s details.
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You can also use the wearable to set reminders, control your device hands-free and type, all as fast as you can think.
It gets even more interesting when two different people wear the device. You can hold silent conversations with each other, and even have your message translated into another language for the receiver. Since Alterego uses your brain signals and mouth movements to detect what you want to say, communication isn’t affected by external sounds or motions.
The device could also prove to be a huge medical win, as it can restore speech to those who have lost it due to illness or other impairments.
Alterego believes this is just the beginning and that it’s “building a future where humans and AI collaborate at the speed of thought, bridging the gap between mind and machine.”
You can sign up for early access when the wearable is available at alterego.io.
