Exploring the Use of the Picture Exchange Communication System (PECS) in Special Education Settings.

The Picture Exchange Communication System (PECS) is an Augmentative and Alternative Communication (AAC) system which is widely used to support children with developmental disabilities. In the present study, we surveyed individuals responsible for implementing PECS in special educational settings in the United Kingdom (N=283). We explored knowledge of and adherence to the  intervention, with a view to identifying training and support needs. Specifically, we examined participants' knowledge, implementation accuracy, training experiences, access to resources, and attitudes towards PECS. We developed hierarchical logistic regression models to explore the association between training experience and both knowledge and use of PECS. We pre-registered our methods, predictions and the analysis plan on the Open Science Framework (OSF).We found considerable variation in practitioner knowledge and implementation of PECS. Formal training predicted greater knowledge and more accurate implementation when practitioner role and the degree of setting support were accounted for. While PECS was rated by a large majority to be effective and practical, many participants identified that time and the availability of resources were barriers to implementation. We also found that the purpose of PECS was not always fully understood by practitioners, and we identified some consistent gaps in knowledge and implementation.  This study contributes new information regarding the real-world  use of PECS in educational settings and offers new insights for supporting practitioners.

Applications of within-stimulus errorless learning methods for teaching discrimination skills to individuals with intellectual and developmental disabilities: A systematic review.

Errorless learning is an instructional strategy used widely with individuals with intellectual and developmental disabilities. The present systematic review aims to update the literature on the application of 'within-stimulus' errorless procedures. The protocol was registered with PROSPERO (CRD42018118385). Twenty-eight articles including 283 participants met the operationally defined inclusion criteria. In the majority of cases, the errorless learning procedures evaluated led to improvements in acquiring discrimination skills. Most of the reviewed studies evaluated stimulus fading. Results are discussed in relation to the selection of within-stimulus procedures. Areas identified for future research include further evaluations of other within-stimulus tactics, as well as further refinement of procedural parameters.

Arbitrarily applicable spatial relational responding.

Spatial reasoning, where novel spatial relationships are inferred based on trained relationships, can be conceptualized as arbitrarily applicable spatial relational responding. Here, we conducted two experiments to develop and validate, for the first time, a laboratory procedure to establish arbitrarily applicable spatial relational responding in adult humans. In Experiment 1, participants were trained on nonarbitrary spatial relational tasks designed to establish contextual cues for left of, right of, above, and below. Contextual cues were then used to train a series of arbitrary spatial relations involving four abstract shapes. Following training in a subset of arbitrary relations (A is left of B, B is above C, C is right of D), subsequent testing examined the emergence of untrained spatial relations (B is right of A, C is below B, D is left of C, D is below A and A is above D). When absent in initial tests, spatial relational responding was facilitated by a remedial training procedure incorporating nonarbitrary relational guidance. Participants showed patterns of spatial relational responding consistent with test relations. In Experiment 2, a variant reversal design yielded predictable, reversed spatial relational responses. Overall, the present procedures represent the first empirical demonstration of arbitrarily applicable spatial relational responding and thus, arguably, the first functional analytic model of spatial reasoning.

Emergent verbal behavior in preschool children learning a second language.

We evaluated the emergence of untaught second-language skills following directly taught listener and intraverbal responses. Three preschool children were taught first-language (English) listener responses (e.g., "Point to the horse") and second-language (Welsh) intraverbal responses (e.g., "What is horse in Welsh?" [ceffyl]). After intervention, increases in untaught second-language tacts (e.g., "What is this in Welsh?" [ceffyl]) and listener responses (e.g., "Point to the ceffyl") were observed for all 3 participants.

Facilitating relational framing in children and individuals with developmental delay using the relational completion procedure.

The Relational Completion Procedure is effective for establishing same, opposite and comparative derived relations in verbally able adults, but to date it has not been used to establish relational frames in young children or those with developmental delay. In Experiment 1, the Relational Completion Procedure was used with the goal of establishing two 3-member sameness networks in nine individuals with Autism Spectrum Disorder (eight with language delay). A multiple exemplar intervention was employed to facilitate derived relational responding when required. Seven of nine participants in Experiment 1 passed tests for derived relations. In Experiment 2, eight participants (all of whom, except one, had a verbal repertoire) were given training with the aim of establishing two 4-member sameness networks. Three of these participants were typically developing young children aged between 5 and 6 years old, all of whom demonstrated derived relations, as did four of the five participants with developmental delay. These data demonstrate that it is possible to reliably establish derived relations in young children and those with developmental delay using an automated procedure.

Brief report: effects of tact training on emergent intraverbal vocal responses in adolescents with autism.

The present study evaluated the emergence of intraverbal responses following tact training with three adolescents diagnosed with autism spectrum disorders. Participants were taught to tact the name of a cartoon character (e.g., "What is the name of this monster?" ["Simon"]) and that character's preferred food (e.g., "What food does this monster eat?" ["Chips"]). Following tact training, test probes revealed the emergence of untrained vocal intraverbals. Specifically, in the absence of pictures, participants stated the name of the character when given the food preference (e.g., "Which monster eats chips?"), and stated the food when given the character name (e.g., "What food does Simon eat?"). The findings are discussed with reference to the growing literature on verbal behavior and derived relational responding.

Evaluating the evidence base for relational frame theory: a citation analysis.

Relational frame theory (RFT) is a contemporary behavior-analytic account of language and cognition. Since it was first outlined in 1985, RFT has generated considerable controversy and debate, and several claims have been made concerning its evidence base. The present study sought to evaluate the evidence base for RFT by undertaking a citation analysis and by categorizing all articles that cited RFT-related search terms. A total of 174 articles were identified between 1991 and 2008, 62 (36%) of which were empirical and 112 (64%) were nonempirical articles. Further analyses revealed that 42 (68%) of the empirical articles were classified as empirical RFT and 20 (32%) as empirical other, whereas 27 (24%) of the nonempirical articles were assigned to the nonempirical reviews category and 85 (76%) to the nonempirical conceptual category. In addition, the present findings show that the majority of empirical research on RFT has been conducted with typically developing adult populations, on the relational frame of sameness, and has tended to be published in either The Psychological Record or the Journal of the Experimental Analysis of Behavior. Overall, RFT has made a substantial contribution to the literature in a relatively short period of time.