Neurons genetically modified to respond to light have been successfully implanted into rats, and could provide a better and longer-lasting way to link brains with computers
Source:
https://www.newscientist.com/article/2259846-living-electrodes-for-linking-brains-to-computers-tested-in-rats/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home