Systematic Review of Verbal Operants in Speech Generating Device Research from Skinner's Analysis of Verbal Behavior.

Skinner's (1957) book is a critical tool in designing effective communication programs for individuals with limited speech. The purpose of this systematic review was to analyze the speech generating device (SGD) research literature from Skinner's taxonomy of primary verbal operants. An extraction procedure yielded 56 studies published between 1995 and 2018, with a total of 221 participants, most of whom had autism spectrum disorder (ASD) or an intellectual and developmental disability (IDD). The large majority of SGD studies (42) targeted multiply controlled mands, whereas only a handful of studies targeted verbal operants that were not mands. Few studies employed procedures for fading contrived sources of stimulus control to promote spontaneous responding, and few studies targeted more sophisticated, topography-based responses (e.g., typing, speech). Results of the review highlight the need for better dissemination of Skinner's , the need for research to evaluate effects of SGD in teaching a greater variety of spontaneous verbal operants, and the need to focus on application of SGD with populations beyond individuals with ASD and IDD.