Effects of varied dosage of aided input on following directives that contain prepositions for children with Autism Spectrum Disorder (ASD)

Abstract

Background: Some children with ASD have comprehension difficulties that affect their ability to follow directives that contain prepositions. Aided input has been known to facilitate improved comprehension skills when spoken language is used with graphic symbols. Aims: This study examined the effects that aided input presented at two levels (20% of aided input and 60% of aided input) has on children with ASD’s following of directives that contain prepositions. Methods: An experimental, within-subjects crossover design was utilised where all participants were exposed to each treatment condition at a different time period. Altogether 21 participants between 5.0 and 11.11 years of age were asked to follow 12 directives using aided input at two conditions. Participants first completed a pre-test task to confirm their noun knowledge, preposition knowledge and matching skills. Participants were described based on the CARS classification and their PPVT-4 scores. The effects of the aided input were measured and compared based on the accuracy of responses. Results: Descriptive statistics were used to describe the data, and multivariate analysis was used to analyse the data. Some children with ASD (n=9) who received a higher level of aided input (60%) were able to respond more accurately than those who received a lower level of aided input (20%). However, some children with ASD (n=4) responded more accurately to the lower level of aided input (20%) than the higher level of aided input (60%). Some children with ASD (n=5) responded in the same manner for both levels of aided input and some children with ASD (n=3) did not respond at all despite the level of aided input. The results showed no statistically significant difference between the higher (60%) and lower (20%) levels of aided input. Conclusion: It was concluded that the 60% aided input level yielded a higher accuracy of responses than the 20% aided input level in some children with ASD. In addition, the results suggest that augmenting spoken language was advantageous in some children with ASD. However, further research is needed to better describe the effects of aided input, using graphic symbols. Future research directions are suggested.