Picture Exchange Communication System (PECS) has been widely used for children with autism spectrum disorder (ASD) to promote their communication skills. However, it is not clear whether there is a functional relationship between the use of PECS and acquisition of verbal expressions of children with ASD when the PECS procedures are implemented with additional behavioral techniques, such as time delay or mora rhythm tapping. This study examined the different effects between the PECS training with time delay and the training with mora rhythm tapping on verbal expression skills of two young children with ASD. During the PECS training with time delay session, the implementer received a card from the participant after 5seconds elapsed since he or she handed it over to the implementer. During the PECS training with mora rhythm tapping session, the implementer tapped the picture card that the participant handed over. The number of tapping was determined according to the number of mora of a name of the item presented on the card. While tapping the card, the implementer also provided a verbal prompt by saying the name of the item. In this study, a multiple baseline design across two children with ASD and items was utilized. As a result of the study, both participants’ use of verbal expression increased during the PECS training with time delay session; however, they did not produce any new vocalization during this session, which they did not have in prior to the study. In contrast, during the PECS training with mora rhythm tapping session, the participants produced several new vocalizations. However, the frequency of occurrence of such behavior was fluctuated throughout the session. Therefore, more research is needed to investigate how to increase the occurrence of new vocalization of children with ASD when utilizing the PECS training with mora rhythm tapping.
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