A recently published report in the journal Nature documents a novel “brain-to-text” communication system that has enabled a paralyzed man to think of typing and make it actually happen on a computer screen.
A previous system created by the same researchers topped out at about 25 characters per minute. In that system, the user would look at a virtual keyboard and implants would monitor muscles in the eyes to guess where they were going. But it was slow and required a lot of focus on the part of the user.
Two implants monitor electrode activity for patterns associated with the thought of writing different letters. They asked the man to imagine himself writing out the alphabet and recorded the neural activity to identify patterns associated with each character.