Preferred Name

Jessie Serrao

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Date of Graduation

Spring 2019

Document Type


Degree Name

Master of Education (MEd)


Department of Educational Foundations and Exceptionalities


Sara Snyder

Laura Desportes

Geralyn Timler

Keri Bethune


Individuals with autism spectrum disorder (ASD) or other developmental disabilities may experience rigid or repetitive behaviors, known as stereotypy. Current research determines effective interventions for increasing variability of vocal responding which effectively decrease stereotypic vocal responding. Lag schedules of reinforcement are a common theme among variability of vocal responding research. The purpose of this AB design study was to evaluate the effectiveness of a Lag 3 schedule of reinforcement in the teaching of variability of tacting. Results indicated that both variable and novel responses increased after the implementation of the Lag 3 schedule, but since these results are based off an AB design, further research that replicates effects needs to be done.

Thesis Acceptance.pdf (209 kB)
Thesis Acceptance Form

embargo.pdf (660 kB)
Embargo Form



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