In cases of paralysis the function of the Expressive Transducer (speech) may be emulated by computers.
Equally debilitating is spastic paralysis. For just about every movement in the body, there are two sets of muscles involved--the agonists and the antagonists.
They must coordinate in perfect balance for each movement, no matter how small, to occur smoothly. When this process fails, the movements become jerky or locked.
Cerebral palsy is an example of childhood spacticity. This can be so severe that the child may never even learn to walk or crawl, let alone learn to talk.
Again, computers may be the only means available to communicate.
Continuing now, our discussion of transducers, the expressive transducer (speech) changes patterns of electro-chemical impulses in the speaker‰s nervous system into patterns of mechanical energy (sound waves) in the environment.
It takes a second (receptive transducer) to convert it back into electro-chemical impulses in the listener‰s brain.
NOTES: Hear an example of Spatistic Speech (Huntingtons Chorea) and obtain more Information on Cerebral Palsy