Masters Thesis

Multiple-stimulus without replacement preference assessment: reducing the number of presentations to identify preferred stimuli

One way to identify potentially reinforcing stimuli is to conduct a preference assessment. There has been evidence to support the use of a single-session multiple stimulus without replacement (MSWO) preference assessment. This procedure has been shown to be an efficient and effective method for identifying reinforcer hierarchies amongst individuals. The present study further evaluated the efficacy and efficiency of a single and multiple-session MSWO preference assessments with five adolescent males diagnosed with Autism. Following a preference assessment with a pre-randomized amount of sessions, a reinforcer assessment was conducted to evaluate the reinforcing values of the preferred and nonpreferred stimuli. Results indicated that while reinforcer hierarchies were established, there should be an attempt to test the reinforcing value of the highly preferred stimuli. Results indicated variation amongst the HP and LP stimuli across the single, three, and five-session MSWO preference assessments.