The Impact of Presupposition on the Syntax and Morphology of a Child Who Uses AAC
Children with complex communication needs often rely on augmentative and alternative communication (AAC) to communicate. Use of AAC can result in messages with limited syntax and morphology that are difficult for communication partners to understand. This case study examines the linguistic productions of a child who uses high-tech AAC, with emerging literacy skills, under two pragmatic presupposition conditions. In Condition 1, the child believes the communication partner has a larger amount of background information about the topic being discussed. In Condition 2, the child presupposes the communication partner has less background information about the topic being discussed. Condition 2 resulted in the child's production of more complex morphology and syntax in comparison to Condition 1. The results suggest pragmatic presupposition might have impacted the level of morphologic and syntactic complexity produced. Possible clinical implications and suggestions for facilitating production of linguistically complex sentences are discussed.