Scientists in California have developed a new brain-computer interface (BCI) that can quickly turn a person’s thoughts into spoken words. They tested it on a 47-year-old woman who lost her ability to speak after a stroke 18 years ago. As part of a medical trial, doctors placed the device in the part of her brain that controls speech. The results, published in Nature Neuroscience, showed that the device could successfully turn her thoughts into clear sentences. Unlike older devices that had delays, this BCI works smoothly and without stopping, making it easier for users to communicate. The system uses tiny electrodes to pick up brain signals when the woman silently thinks about speaking. Artificial intelligence reads these signals and turns them into spoken words. To make the voice sound natural, the team used a speech synthesizer trained on recordings of her voice before the stroke. The system processes brain signals every 80 milliseconds and creates speech in real time. Experts say this breakthrough could change how people with speech disabilities communicate. Although it is still being tested, it may be ready for clinic use in about ten years.