Empowered by AI: Stroke Survivor Restores Speech After 18 Years of Silence

A woman who was paralyzed after a stroke regained her ability to speak after 18 years of silence, thanks to an experimental brain-computer interface (BCI) and artificial intelligence. This development is detailed in a study published in the journal Nature Neuroscience.

Researchers from the University of California, Berkeley, and the University of California, San Francisco, utilized:

The team recorded Anna’s voice from a wedding video taken two decades ago and subsequently created a synthetic version using digital technology. The device converted her brain signals into speech within seconds.

«The true driving force here is Anna. Her brain is doing all the heavy lifting, and we’re simply interpreting what it attempts to convey. AI fills in some gaps, but Anna is the star of the show,» commented Gopala Anumanchipalli, an assistant professor of electrical engineering and computer science at UC Berkeley.

Rather than relying on off-the-shelf AI models, the team developed a bespoke system tailored specifically for Anna.

«As engineers and scientists working in artificial intelligence, we create our own tools customized for Anna. A generic AI is inadequate, especially in healthcare, where one size doesn’t fit all. We need to rethink and create personalized solutions for each individual,» Anumanchipalli emphasized.

The necessity of developing proprietary AI also underlines the importance of user privacy, noted the expert.

Anna’s success forms part of a broader movement in BCI research, attracting major players, including Elon Musk’s Neuralink.

On April 2, the startup announced recruitment for participants from around the globe to test its device allowing computer control via thought alone.

The company is seeking individuals with quadriplegia—paralysis affecting all four limbs.

In March, Neuralink’s first patient, Noland Arbo, reported no side effects one year after receiving the BCI implant. He uses his brain chip «for a variety of tasks» for over 10 hours each day. Meanwhile, researchers are exploring how to control wheelchairs using the implant.

In January 2024, the startup successfully implanted a brain chip into its first volunteer. Soon after, Arbo learned to control a computer mouse with his thoughts.

In August, Musk announced the successful completion of a new surgery. He stated that his company’s BCI would enable not only paralyzed individuals to navigate simple computer interfaces with their thoughts but would also offer exceptional capabilities such as thermal or eagle vision. The third operation took place in January 2025.

By late March 2025, Neuralink scheduled a surgery aimed at restoring vision. They intend to implant a new chip named Blindsight into the brain.

It is worth noting that in November 2024, the Canadian Ministry of Health approved the commencement of clinical trials for Neuralink’s neurochips.