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With low-tech devices, a communication partner is involved and must interpret the symbols chosen. Picture Communication Exchange System (PECS) is a commonly used low-tech communication system that teach individuals how to request, comment, and answer questions through the use of line drawings known as Picture Communication Symbols (PCS).
Such display devices have a simpler learning curve than some other devices. Fixed display devices replicate the typical arrangement of low-tech AAC devices (low-tech is defined as those devices that do not need batteries, electricity or electronics), like communication boards.
Communication board: Low-tech AAC device that displays pictures or words to which an individual points to communicate; Communication disorder: Disorders in speech, language, hearing, or listening that create difficulties in effective communication; Disfluency: Interruptions in the flow of an individual's speech
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Due to speech, motor, and cognitive decline, success with AAC devices in this population is variable [14]. Overall, amplifiers and alphabet boards are the most common low-tech AAC devices and the Lightwriter is the most common high-tech AAC device assigned to people with Parkinson’s disease [14].