A systematic review of acquisition and mastery of skills taught using the Picture Exchange Communication System.

The Picture Exchange Communication System (PECS) is a popular augmentative and alternative communication intervention for individuals with developmental disabilities that includes six, sequential phases of instruction. We systematically reviewed published and unpublished single-case PECS studies for details about the percentage of participants mastering PECS phases, how long it took participants to master PECS phases (in trials to mastery), and what constituted mastery of PECS phases. We found most participants mastered only the first two phases of PECS, and Phases I, II, and IV showed the slowest and widest variability in trials to mastery. Moreover, participants who were taught the third PECS phase learned to select from an average array of three symbols, which may limit the range of messages they can communicate. We discuss our findings in light of a few important limitations and provide directions for future researchers along with recommendations for professionals who might consider PECS.

Meta-Analytic Methods to Detect Publication Bias in Behavior Science Research.

Publication bias is an issue of great concern across a range of scientific fields. Although less documented in the behavior science fields, there is a need to explore viable methods for evaluating publication bias, in particular for studies based on single-case experimental design logic. Although publication bias is often detected by examining differences between meta-analytic effect sizes for published and grey studies, difficulties identifying the extent of grey studies within a particular research corpus present several challenges. We describe in this article several meta-analytic techniques for examining publication bias when published and grey literature are available as well as alternative meta-analytic techniques when grey literature is inaccessible. Although the majority of these methods have primarily been applied to meta-analyses of group design studies, our aim is to provide preliminary guidance for behavior scientists who might use or adapt these techniques for evaluating publication bias. We provide sample data sets and R scripts to follow along with the statistical analysis in hope that an increased understanding of publication bias and respective techniques will help researchers understand the extent to which it is a problem in behavior science research.

A Meta-Analysis of Video Modeling Interventions to Enhance Job Skills of Autistic Adolescents and Adults.

Background: Autistic transition-aged youth and young adults face many societal barriers to competitive integrated employment (CIE). Existing evidence-based practices (EBPs) for autistic individuals, such as video modeling (VM), may be a viable on-the-job training method to enhance employment experiences and outcomes for this population. Methods: The purpose of this meta-analysis was to synthesize VM studies to teach job skills for autistic individuals. We applied the Council for Exceptional Children's (CEC) Standards for Evidence-Based Practices in Special Education to evaluate the methodological rigor of included studies using a weighted coding scheme. We further evaluated methodologically sound studies by calculating an omnibus Tau-U effect size. Results: Twenty articles met our inclusion criteria, and 11 of those studies were classified as methodologically sound according to the CEC's criteria. Results indicate that VM is an EBP to improve job skills of autistic individuals. The overall effect size for methodologically sound studies was strong (0.91), but most studies occurred in contrived or school-based employment settings rather than CIE settings in the local labor market. Conclusions: Employers, transition professionals, and related service providers can consider VM a viable method to teach job skills to autistic employees. However, additional research conducted in CIE settings is needed to better understand the effects of VM in contexts where autistic employees earn regular wages. Lay summary: Why was this study done?: Autistic adolescents and adults often experience barriers obtaining employment in their local communities. They may also benefit from on-the-job supports for successful employment. Video modeling is one intervention technique that has been used to teach a variety of skills to autistic individuals. Video modeling involves creating short video clips that show the person how to do specific skills or tasks. We wanted to learn about how video modeling has been used to teach job skills to autistic employees.What was the purpose of this study?: The purpose of this study was to evaluate the quality of research studies that used video modeling to teach job skills to autistic employees. Understanding how video modeling interventions can be used in employment settings may help autistic employees have more positive work experiences.What did the researchers do?: The researchers analyzed the video modeling research studies with autistic participants aged 14 years or older. We evaluated the quality of each study, type of employment setting, type of job skill, and how much the job skills improved. We used a criteria established by a professional organization, the Council for Exceptional Children, to evaluate the quality of the research studies.What were the results of the study?: We analyzed 20 research studies and found that video modeling was an overall effective intervention to teach job skills to autistic adolescents and adults. However, most of the studies focused on general job tasks rather than employment-related social skills. In addition, most of the studies were conducted in employment settings where the autistic employees did not earn regular wages, such as school settings or internships. We encourage future researchers to study how video modeling can be used to promote competitive integrated employment in community settings.What do these findings add to what was already known?: Prior research studies have used video modeling to teach skills such as academic, play, and social skills to autistic children and youth. This study showed us that video modeling is an effective intervention to teach job skills to autistic adolescents and adults.What are the potential weaknesses of the study?: There are disagreements about how to evaluate the quality of research studies in the field of special education. We used a popular criterion by the Council for Exceptional Children organization, but our results may be different from other researchers. We also did not find a large number of studies, so some of our findings should be considered with caution.How will these findings help autistic adults now or in the future?: These findings demonstrate that video modeling is an effective on-the-job training method for autistic employees. Autistic adults can use video modeling at work to learn new job skills. Employers, job coaches, and secondary transition professionals could use brief videos to support autistic employees.

Endrew and FAPE: Concepts and Implications for All Students With Disabilities.

The opinion of the Supreme Court of the United States in the Endrew case has implications for the education of all students with disabilities. Implications for several categories of disability are discussed: those with autism spectrum disorder and those with disabilities often considered high incidence, particularly those placed for a significant portion of their school day in general education. The aspects of the Individuals with Disabilities Education Act most relevant to the Endrew case are also compared with Article 24 of the United Nations's Convention on the Rights of Persons with Disabilities. The opinion in Endrew may affect the course of special education and the role of behavior modification in meeting the needs of all students with disabilities.

Meta-analyses and effect sizes in applied behavior analysis: A review and discussion.

For more than four decades, researchers have used meta-analyses to synthesize data from multiple experimental studies often to draw conclusions that are not supported by individual studies. More recently, single-case experimental design (SCED) researchers have adopted meta-analysis techniques to answer research questions with data gleaned from SCED experiments. Meta-analyses enable researchers to answer questions regarding intervention efficacy, generality, and condition boundaries. Here we discuss meta-analysis techniques, the rationale for their adaptation with SCED studies, and current indices used to quantify the effect of SCED data in applied behavior analysis.

A Systematic Review of Linguistic and Verbal Behavior Outcomes of Pivotal Response Treatment.

Pivotal Response Treatment (PRT) is a popular intervention for improving targeted and untargeted communication skills for learners with autism. We systematically reviewed communication outcomes reported in experimental research to determine linguistic forms and verbal behavior functions associated with PRT. We found most researchers aggregated results or did not report sufficient detail to determine linguistic forms and/or verbal behavior functions. Generalization of communication skills to untargeted people, settings, materials, and/or activities was evident. However, only one study clearly indicated untargeted linguistic forms emerged following PRT, and no researchers described results that indicated improved generalized and collateral verbal behavior functions. We suggest PRT researchers more clearly define and report primary, generalized, and collateral communication-specific outcomes in order to advance research and practice.