What is a symbol system commonly used in AAC devices?

The Picture Exchange Communication System (PECS) is a widely recognized symbol system used in augmentative and alternative communication (AAC) devices. It utilizes pictures or symbols to help individuals with communication challenges express their needs, desires, and thoughts. PECS is particularly beneficial for individuals with autism spectrum disorders or other communication impairments, as it encourages spontaneous communication through visual representation.

This system is structured in a way that facilitates interaction, teaching users to exchange pictures for actual objects or actions. It typically progresses through distinct phases, beginning with simple exchanges and moving towards more complex sentence structures. Its use of easily recognizable images makes the process intuitive and accessible for both users and their communication partners.

In contrast, other options, while potentially related to communication, do not specifically function as systems used in AAC devices in the same structured manner as PECS does. Sign language, for instance, is a natural language developed for the deaf and hard of hearing communities and may not be universally applicable for AAC users who rely on symbol systems. Alphabetic symbols and Morse code represent communication forms that involve rule-based systems requiring literacy and may not be effective for individuals with severe communication impairments.