Tiny implant 'speaks' to the brain with LED light

Scientists have developed a wireless brain implant smaller than a finger that uses LED light to communicate with genetically modified neurons in mice brains. The flexible device sits under the scalp and projects 64 different light patterns through the skull, activating specially engineered brain cells across the cortex. Mice successfully learned to distinguish between light patterns and perform specific tasks for rewards, demonstrating the technology's potential for future prosthetics that could restore touch, vision, or hearing without invasive brain surgery.