Woman regains speech 18 years after stroke with brain implant

Eighteen years after suffering a brainstem stroke that left her with locked-in syndrome and near-total paralysis, Ann Johnson regained the ability to speak through an AI-powered brain-computer interface (BCI). The implant, placed over her brain’s speech motor cortex, detects neural signals when she attempts to speak and translates them via an AI decoder into audible words and facial animations on a digital avatar. Initially, the system had an eight-second delay due to sentence-based processing, but recent advances reported in 2025 have reduced this latency to about one second using a streaming AI architecture, enabling near-real-time communication. Johnson’s voice was personalized using recordings from her 2004 wedding speech, and she selected an avatar that mimics her facial expressions. The clinical trial, led by researchers at UC Berkeley and UCSF, aims to transform neuroprostheses from experimental devices into practical, plug-and-play clinical tools. Future developments may include wireless implants and photorealistic avatars to enhance natural interaction. The technology