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Theory:

     β€œIt was a great feeling when I learnt to use it, it took me a couple of weeks. Communicating with people was very difficult before.”

 

     He has an ACTIV controller also in the headrest of his chair in his bedroom, which means he can control his TV, Blu-Ray and music players.

 

     David was born with Athetoid Cerebral Palsy and attends a specialist school and college. He has been using a high tech communication aid since he was eight years old and has been interested in AAC(Augmentative and Alternative Communication) and technology ever since!
Explanation:
 
Learning to use the liberator communication system, according to David, was a fantastic experience that took him a couple of weeks to accomplish. He had a hard time communicating with others before he was introduced to the liberator communication system. In his bedroom, he had an ACTIV controller on the headrest of his chair, allowing him to manage his TV, Blu-Ray player, and music player.
 
David was born with a variant of Cerebral Palsy called Athetoid Cerebral Palsy. It's a movement disorder caused by a brain injury that occurs early in life. A brain damage that occurs late in pregnancy or shortly after birth causes this type of cerebral palsy, which is characterised by abnormal, uncontrollable movement.
 
David was attending a special school and college since he had Athetoid Cerebral Palsy. Since this condition affects the muscles of the face and tongue, speech problems develop. Since he was eight years old, David has been using a high-tech communication device and has been fascinated by AAC (Augmentative and Alternative Communication) and technology. AAC refers to collection of communication methods that can help people with severe expressive communication difficulties augment or compensate (temporarily or permanently) for their impairments and disabilities.
Reference:
State Council of Educational Research and Training (2018). English Standard-10. Tech Bloomers (pp. 126-130). Published by the Tamil Nadu Textbook and Educational Services Corporation.