About one-third of autistic people have limited ability to use speech. Some have learned to communicate by pointing to letters of the alphabet.
Nearly two-thirds of autistic individuals are also apraxic. Apraxia is a neurological condition affecting the ability to perform actions, such a speech and purposeful movement of the body, on demand.
Current means of assessing cognition, language and academic achievement may be underestimating the ability of nonspeaking individuals.