Communication technology, the chair with the right features and some batteries in the back. They accommodated a sofward "Assistive Context Aware Toolkit (ACAT)" which through a loud voice and cheek movements allowed him to communicate and the little movement of his hand until he lost it completely.
It works through a sensor located in the glasses that detects the movements of the cheek. This way you can tell the system what you want to do.
Not only hardware was used to communicate; It had a complex algorithm that allowed it to express itself without problems. This was based on the vocabulary of his books and conferences. In this way it was only enough to type the first two letters in order to have the complete word. Similar to a concealer, but much more advanced.
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