SeattleBattles t1_j63f1o7 wrote

It doesn't read their thoughts per se. It detects signals from their motor cortex. When you speak that part of your brain tells your tongue, mouth, throat, ect to move in certain ways. Even though these signals don't make it to those body parts when a person has ALS, they are still there. The implant detects those signals and can tell what the person was trying to say.