The stereotypy analysis: an instrument for examining environmental variables associated with differential rates of...

The Stereotypy Analysis, a means of analyzing environmental variables associated with differential rates of stereotypic behavior, was conducted with five persons having moderate to profound developmental disabilities. The process involves partial-interval recording of the occurrence of targeted behaviors and the presence/absence of specific environmental events. The Stereotypy Analysis was able to detect environmental events associated with stereotypic responding for 3 of the 5 subjects. Based on the results of the Stereotypy Analysis, indicated and not-indicated interventions were implemented for two subjects. The data obtained using the Stereotypy Analysis were useful in determining effective interventions for those subjects. Providing activities and prompts every 15 s, later faded to every 30 s, reduced handmouthing from a mean of 40% of intervals to 13% for one subject. Providing prompts every 30 s to engage in an activity decreased body rocking from 60% to 15% for the other. Effects for both interventions were replicated using A-B-A-B designs. The not-indicated intervention was unsuccessful for one subject; it suggested multiple control of the behavior for the other. Implications for behavioral theory and practice are discussed.