We measured the speed and accuracy with which they looked at and pointed to letters as they responded to novel questions. In the study reported here, we used head-mounted eye-tracking to investigate communicative agency in a sample of nine nonspeaking autistic letterboard users. Indeed, some scientists have dismissed the possibility that any nonspeaking autistic person who communicates with assistance could be conveying their own thoughts. But this method is controversial because it requires the assistance of another person-someone who holds a letterboard in front of users and so could theoretically cue them to point to particular letters.
Some have learned to communicate by pointing to letters of the alphabet. About one-third of autistic people have limited ability to use speech.
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