"This study examined the prerequisite skills necessary to conduct a no-access video-based preference assessment for two children with Autism Spectrum Disorder (ASD) who did not demonstrate a selection response during a video-based preference assessment. A brief Multiple Stimulus Without Replacement (MSWO) of videos of toys was used to teach a selection response by systematically fading the participants' access to toys during the preference assessment. Once the selection response was successfully taught with the toys, it was assessed with videos of social interactions. A progressive ratio (PR) schedule and concurrent operant reinforcer assessment were then conducted to determine the reinforcing effectiveness of the highest and lowest preferred social interactions from a brief MSWO for each of the participants. The selection response was successfully taught to both participants and mixed results were found from both reinforcer assessments for both participants."--Page ii.
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