I love TED Ed and they uploaded a video on ALS a few days back. Check it out!
I always wondered how Stephen Hawking communicates and it turns out that his computer uses a special interface which scans through the possible actions. When he moves his chin a sensor detects the movement and the currently active option is chosen. The article states that it took a minute for him to write 2 words around 2016, which may have been improved by learning algorithms.