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AAC stands for augmentative and alternative communication. AAC is a way for individuals to communicate when they do not have the physical ability to use verbal speech or writing. AAC systems are designed to help people express their thoughts, needs and ideas. AAC is used by those with a wide range of speech and language impairments due to conditions such cerebral palsy, autism, spinal muscular atrophy and head injuries. AAC can range from a simple set of picture symbols on a communication board to a computer system that is programmed to speak with words or messages. Video by Cincinnati Children's Hospital Medical Center.