Answer:
linguistic
Step-by-step explanation:
In simple words, Individuals who want to use AAC suffer serious verbal communication disabilities that are marked by voice, vocabulary, reading , as well as writing disabilities.
Linguistic maturity requires the understanding and skills to use the language(s) spoken and published within the family and culture of the person (see Language in Brief), and also the skill and expertise to use the AAC system's programming language (representations, vocabulary, punctuation).