![]() ![]() However, over the course of 12 intervention sessions and the maintenance session, his performance became similar among both embedded and non-embedded VSDs. Results show that the participant was initially more accurate and faster in locating vocabulary among embedded VSDs, when compared to non-embedded VSDs. ![]() Accuracy and latency data for locating target VSDs and vocabulary items were measured over 12 intervention sessions and one maintenance session. four embedded and four non-embedded VSDs, each containing six vocabulary items). A single case experimental alternating treatment design was applied and the participant was taught to locate 48 vocabulary items that were equally divided among eight VSDs (i.e. This study compared the performance of locating vocabulary in embedded and non-embedded visual scene displays (VSDs) on a speech-generating device by one 19-year-old male diagnosed with autism spectrum disorder. This study provides an example of using single case experimental design to guide data-driven, low-inference interventions for an individual using customized displays on a speech-generating device and can serve as an example for interventionists who need to compare intervention strategies to identify approaches that are most appropriate for a specific learner. However, younger children learn to use VSDs in relatively few instructional opportunities, suggesting that VSDs can be used with children as young as 2 years of age. Older children perform better than younger children on initial opportunities. Results also indicated that though younger participants required significantly more sessions to achieve mastery, when the effects of practice and language comprehension were controlled, performance differences between age groups were not found when maintenance was evaluated. Results indicated that, at initial exposure, older participants' symbol selections were significantly more accurate and significantly faster when navigating through each page of a 2-page dynamic VSD. Tests of mean difference and analyses of variance were both completed to examine within- and between-age-group performance for accuracy and latency across 3 time points: at initial exposure, at criterion, and at a 2-week maintenance session for each of 2 linked navigational pages. This study examined initial and subsequent performance during VSD use by children age 24-27 and 33-36 months to explore child characteristics that may relate to navigational skill differences.Ĭhildren located 9 vocabulary items using a dynamic VSD. Evidence supports using visual scene displays (VSDs) with young children using speech-generating devices.
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