Evaluating the Emergence of Reverse Intraverbals in Children with Autism

Verbal behavior plays a fundamental role in the development of complex social and communication skills. Many children diagnosed with autism spectrum disorder exhibit profound deficiencies in intraverbal repertoires and the development of social relationships. Recent studies that investigated the effects of intraverbal training on the emergence of reverse intraverbals produced mixed results (e.g., Perez-Gonzalez et al., Journal of Applied Behavior Analysis 40:697–701, 2007)). In the current study, a multiple-probe design across four participants with autism was used to evaluate the effects of intraverbal training on the emergence of reverse intraverbals. Intraverbal training consisted of multiple exemplars taught concurrently, bidirectional stimulus-response teaching formats, general case analysis, reinforcement, and a constant prompt delay (CPD) procedure. Participants were trained on intraverbal targets and probes were conducted to assess emergence of untaught reverse intraverbals. Three participants demonstrated the emergence of reverse intraverbals as a result of the intraverbal training procedures. Social validity and maintenance of target responses and emergent reverse intraverbals were assessed.     

The Effects of Auditory Tact and Auditory Imagining Instructions on the Emergence of Novel Intraverbals

The current research investigated whether intraverbals would emerge following auditory tact instruction. Participants were first taught to tact auditory stimuli by providing the name of the item or animal that produces the sound (e.g., saying “eagle” when presented with the recording of an eagle cawing). Following test probes for simple intraverbals as well as intraverbal categorization participants were taught to tact what each auditory stimulus is (e.g., saying “caw” when presented with the recording of an eagle cawing). Following both tact instructional phases, the effects of an auditory imagining instruction procedure on target intraverbals were examined. Results indicate that following both tact instructional phases, intraverbals increased for three of four participants. Auditory imagining instruction was sufficient for two of four participants to reach mastery criterion, and two of four participants needed some direct instruction. Low covariation between simple intraverbal and categorization was also observed. Functional interdependence between tacts and intraverbals and the possible role of a conditioned hearing response are discussed.     

The Effects of Multiple-Tact and Receptive-Discrimination Training on the Acquisition of Intraverbal Behavior

The purpose of this study was to determine whether multiple-tact training and receptive-discrimination training could be used to teach thematically related vocal intraverbals to typically developing preschool children. Multiple-tact training involved teaching a child to name both the item and the category to which the item belonged. Receptive-discrimination training consisted of teaching a child to select a picture card in the presence of a question from the experimenter regarding the item or its category. When neither of these strategies resulted in substantial increases in intraverbal responses, a typical intraverbal training protocol using tact prompts was implemented. Six typically developing children participated in the study. A multiple-baseline design across word categories was used to evaluate the effects of the three training procedures. Results indicated that both multiple-tact and receptive-discrimination training had minimal effects on the strength of the intraverbal repertoire, whereas direct intraverbal training had a more substantial effect. The results provide some evidence of the functional independence of verbal operants, as well as the independence of listener and speaker repertoires. Receptive-discrimination and multiple-tact training may have facilitated acquisition of intraverbals; however, further research is needed to assess how these repertoires might interact with each other.     

Generalized Reflexive Responding and Cross-Modal Tactile Transfer of Stimulus Function in Children with Autism

We sought to evaluate the efficacy of successive matching training for establishing generalized reflexive matching across 4 children with autism. In Experiment 1, differential reinforcement with delay fading was efficacious in establishing “yes” and “no” matching and nonmatching responses in 2 participants when 2 identical or nonidentical picture stimuli were presented. In addition, emergent visual–visual reflexive relational responses were observed using novel picture stimuli in a transfer test phase. In Experiment 2, differential reinforcement alone was efficacious in establishing matching and nonmatching responses in the other 2 participants when 2 identical or nonidentical objects were presented. Transfer to identical objects presented through touch (i.e., tactile discrimination) was additionally observed for both participants. Procedures in the study were adapted from the PEAK Relational Training System to aid in clinical replication, and the translational results have implications for language training with individuals with autism.     

The Effects of Multiple Exemplar Instruction on the Relation Between Listener and Intraverbal Categorization Repertoires

We evaluated the effects of multiple exemplar instruction (MEI) on the relation between listener and intraverbal categorization repertoires of six typically developing preschool-age children using a nonconcurrent multiple-probe design across participants. After failing to emit intraverbal categorization responses following listener categorization training, participants were exposed to MEI in the form of alternating response forms (listener and intraverbal) during categorization training with novel stimulus sets. For two participants for whom there was some evidence of emergent intraverbal responding, responding was variable. For the remaining four participants, 32 to 99 MEI trial blocks produced minimal improvement in responding or no emergent responding at all. The results are discussed in terms of Skinner’s analysis of verbal behavior and naming theory.     

Using Instructive Feedback to Increase Response Variability During Intraverbal Training for Children with Autism Spectrum Disorder

We evaluated the effects of instructive feedback on the variability of intraverbal responses for two children with autism spectrum disorder. Specifically, we used an adapted alternating treatments design to compare participants’ novel responses and response combinations during an intraverbal category program across conditions with and without instructive feedback. During instructive feedback, secondary targets were presented during the consequence event of the learning trial and consisted of a therapist’s model of response variability. The results showed that participants engaged in more novel response combinations during instructive feedback conditions. We discussed the clinical implications of these results as well as areas for future research.     

The effects of listener training on the emergence of tact and mand signs by individuals with intellectual disabilities

The purpose of the current study was to assess whether individuals with intellectual disabilities would emit untrained speaker responses (i.e., signed tacts and mands) after being taught listener behaviors. Listener relations were trained via an automated matching-to-sample (MTS) procedure. Following mastery, the emergence of signed tacts, generalized tacts, and mands was tested. All participants met criterion in listener relations training and showed the emergence of almost all relations. Results suggest that teaching listener relations first, through MTS tasks, is a viable way to produce emergence of speaker relations.     

A Comparison of Prompting Tactics for Teaching Intraverbals to Young Adults with Autism

Several researchers have compared the effectiveness of tact or textual prompts to echoic prompts for teaching intraverbal behavior to young children with autism. We extended this line of research by comparing the effectiveness of visual (textual or tact) prompts to echoic prompts to teach intraverbal responses to three young adults with autism. An adapted alternating treatments design was used with 2 to 3 comparisons for each participant. The results were mixed and did not reveal a more effective prompting procedure across participants, suggesting that the effectiveness of a prompting tactic may be idiosyncratic. The role of one’s learning history and the implications for practitioners teaching intraverbal behavior to individuals with autism are discussed.     

Emergent Intraverbal Forms may Occur as a Result of Listener Training for Children with Autism

The purpose of the present study was to assess whether intraverbal behavior, in the form of answers to questions, emerges as a result of listener training for five children diagnosed with autism. Listener responses were targeted and taught using prompting and differential reinforcement. Following successful acquisition of listener responses, the intraverbal form of the response was probed. Data were evaluated via a nonconcurrent multiple-baseline design that included a control series. Results showed listener-to-intraverbal transfer for four of the five participants. One participant required additional teaching that involved tacting the items selected during listener training.

     

Use of a Modified Chaining Procedure with Textual Prompts to Establish Intraverbal Storytelling

Echoic, tact, and textual transfer procedures have been proven successful in establishing simple intraverbals (Braam and Poling Applied Research in Mental Retardation, 4, 279–302, 1983; Luciano Applied Research in Mental Retardation, 102, 346–357, 1986; Watkins et al. The Analysis of Verbal Behavior, 7, 69–81, 1989). However, these strategies may be ineffective for some children due to the complexity of the targeted intraverbals. The current study investigated the use of a novel procedure which included a modified chaining procedure and textual prompts to establish intraverbal behavior in the form of telling short stories. Visual prompts and rule statements were used with some of the participants in order to produce the desired behavior change. Results indicated that the procedure was effective for teaching retelling of short stories in three children with autism.     

An Evaluation of Two Tact-Training Procedures on Acquired Tacts and Tacting During Play

A common practice in tact training is to include a supplemental verbal stimulus (e.g., “What is it?”) in addition to the presentation of a nonverbal discriminative stimulus. Previous literature has suggested that this supplemental verbal stimulus can impede acquisition and generalization relative to the presentation of the object alone, as it may establish faulty stimulus control or decrease spontaneous tacting. Research has yet to compare these 2 training methods on the generalization of learned tacts to more naturalistic, play-based environments. The present study evaluated the use of “What is it?” compared to the presentation of only the nonverbal discriminative stimulus on tact acquisition among 3 children with autism spectrum disorder and the extent to which these training procedures led to tacting in a play-based setting following discrete-trial training. Overall, participants learned to tact stimuli under both conditions, and all participants demonstrated generalization of tacts in a play-based setting. Recommendations for the development and evaluation of naturalistic posttraining assessment are discussed.     

Effects of a Differential Observing Response on Intraverbal Performance of Preschool Children: A Preliminary Investigation

Axe (2008) speculated that some instances of intraverbal responding might be associated with limited or delayed acquisition because they require discrimination of multiple components of verbal stimuli. Past studies suggest that acquisition of responses under control of complex, multicomponent antecedent stimuli (e.g., conditional or compound stimulus control) can be facilitated with the introduction of a differential observing response (DOR; Dube & McIlvane, 1999; Gutowski, Geren, Stromer, & Mackay, 1995). The purpose of the current study was to evaluate the effects of a DOR (i.e., repeating the question) on intraverbal responding with six neurotypical preschool children. Findings included that (a) accuracy of intraverbal performance increased when the experimenter prompted a DOR; (b) 1 of 6 participants overtly emitted the DOR for a second relation in the absence of prompts, which was correlated with increased accuracy; and (c) following mastery, response accuracy was variable for 3 participants. Based on these findings, prompted DORs may offer an effective, if temporary, aid to intraverbal instruction for neurotypical preschool children.     

An Analog Study of First Language Dominance and Interference over Second Language

The purpose of this study was to design a model for “first language” dominance over “second language” performance and the interference of one language over the other. Two sets of equivalence relations showing a common element (i.e., the reference) were established under different contextual conditions. One set (“first language”) was over trained relative to the other (“second language”). Dominance of the “first language,” as demonstrated in relations involving the common element, was determined by examining performances in the absence of contextual stimuli. Interference by one language over the other was modeled by examining the degree to which resurgence of “first language” and “second language” relations would occur in extinction, following a period of exposure to inconsistent test trials. In addition, both selection-based (i.e., copy text) and topography-based (i.e., intraverbal) equivalence were examined in these areas. The results demonstrated that the development of an analog for a bilingual repertoire, the domination of the “first language” over the “second language” and the interference of one language over the other, were established.     

Teaching Children With Autism Spectrum Disorder to Mand “Why?”

For most children with autism spectrum disorder (ASD), manding for information is an important skill that must be systematically taught. Although previous studies have evaluated interventions for teaching other mands for information, to date no studies have demonstrated effective procedures for teaching the mand “why?” The purpose of the present study was to teach 3 children with ASD to mand “why?” under relevant establishing operation conditions in 3 distinct scenarios. A trial-unique multiple-exemplar procedure was used to promote generalization and increase the value of information provided across trials. All 3 participants learned to mand “why?” in all 3 scenarios within a mean of 18 sessions (range 14–21 sessions), demonstrated generalization to novel stimuli and settings, and maintained this skill over time. Social validity for the intervention had an overall mean of 5.88 (range 1–7).     

Investigating the Acquisition,Generalization, and Emergence of Untrained Verbal Operants for Mands Acquired Using the Picture Exchange Communication System in Adults With Severe Developmental Disabilities

This study compared the total amount of training time and total number of trial blocks for individuals with severe developmental disabilities to acquire mands under control of unconditioned establishing operations and mands under control of transitive conditioned establishing operations for manual sign and for the Picture Exchange Communication System (PECS). Also examined was the generalization of mands across settings and communicative partners, as well as the emergence of untrained tacts and intraverbals for mands acquired using PECS. Mands for preferred items and for items needed to complete a chained task were acquired more rapidly and in fewer training blocks for PECS than for manual sign. Moreover, mands established using PECS generalized across settings and communicative partners. Finally, untrained tacts and intraverbals using PECS were shown to emerge for some of the participants following PECS training. These results suggest that PECS may be a viable alternative communication system for adults with severe developmental disabilities who have little or no history of systematic instruction and limited imitative repertoires.     

Observing Tacting Increases Uninstructed Tacts in Children with Autism

The effects of observing an adult emitting tacts on children’s rate of uninstructed (i.e., “spontaneous”) tacts were examined in three children diagnosed with autism. Each participant was exposed to two conditions in four settings each: in condition 1, participants received 20 trials of teacher-initiated interactions in which the child was asked to tact 20 objects during 5 min. Condition 2 was identical to condition 1 except that the teacher also tacted 20 objects interspersed with the 20 tact trials. The number of uninstructed tacts was recorded in both conditions. Children emitted between 1.58 and 2.68 times more uninstructed tacts in condition 2 than in condition 1. These results indicate that teachers’ emission of tacts increases the emission of uninstructed tacts in children with autism.     

Assessing Transfer of Stimulus Control Procedures Across Learners With Autism

The purpose of this study was to evaluate the effectiveness of 2 transfer of stimulus control procedures to teach tacting to individuals with autism. Five participants with differing verbal skills were assessed by a subset of the ABLLS prior to intervention, then were taught 36 previously unknown tacts using the receptive-echoic-tact (r-e-t) and echoic-tact (e-t) transfer procedures. Each transfer method was used separately to establish different tacts, in a multiple baseline design across tacts for 3 sets of stimuli. The results showed that 4 out of 5 participants (who demonstrated mands, tacts, echoics, and sometimes intraverbals prior to the study) acquired all targeted tacts when either r-e-t or e-t training was presented. One participant (who emitted no verbal operants at the onset of the study) did not acquire any tacts. While some participants appeared to learn more quickly with one transfer method, neither method emerged as more efficient with learners with fewer or more extensive verbal skills. The results indicate that both transfer methods promoted the acquisition of tacts for learners with autism with at least minimal verbal skills.     

Establishing Concurrent Mands for Items and Mands for Information about Location in Children with Autism

This study replicated and extended the methodology used in Howlett et al. (Journal of Applied Behavior Analysis, 44, 943–947 2011) to bring the mands “Where’s (item)?” and “I want (item)” under appropriate antecedent control in two boys diagnosed with autism. Trials were alternated in which items were present, missing, and within view (but inaccessible) and missing and out of view. To program for generalization, fifteen items, multiple trainers, and multiple settings were used during teaching. For both participants, manding generalized to novel items, instructors, settings, and situations and maintained after 2 weeks following teaching. Results of the social validity assessment indicated that school staff found the procedures highly acceptable.     

The Emergence of the Listener to Speaker Component of Naming in Children as a Function of Multiple Exemplar Instruction

We tested the effect of multiple exemplar instruction on the transfer of stimulus function for unfamiliar pictures across listener responses (i.e., matching and pointing) and speaker responses (i.e., pure tacts and impure tacts). Three preschool students, who were 3- and 4-year-old males and did not have the listener to speaker component of the naming repertoire, participated in the experiment. The dependent variable was numbers of correct responses to probe trials of both untaught listener responses (“point to__”) and speaker responses (tact and impure tacts) following mastery of matching responses for two sets of five unfamiliar pictures (Set 1 and Set 3). After each participant mastered matching (e.g., “match Labrador”) for Set 1 pictures they were probed on the three untaught responses to Set 1 words. That is, they were asked to point to Labrador, tact the picture of Labrador, and respond to the picture of a Labrador and the question “What is this?” Next, the participants were taught mastery of all four types of responses using MEI for a second set of five pictures (Set 2) and probed again on the 3 untaught Set 1 responses. Finally, matching responses were taught to mastery for a novel set of pictures (Set 3) and then probed on the three untaught responses. The results showed that untaught speaker responses emerged at 60% to 85% for two participants, and 40%–70% for one participant. We discuss the role of instructional history in the development of the listener to speaker component of naming.     

Multiple exemplar instruction and the emergence of generative production of suffixes as autoclitic frames

We report 2 experiments that tested the effects of multiple exemplar instruction (MEI) across training sets on the emergence of productive autoclitic frames (suffixes) for 6 preschoolers with and without language-based disabilities. We implemented multiple exemplar tact instruction with subsets of stimuli whose "names" contained the suffix "-er" denoting the comparative form of adjectives. Subsets of stimuli included regular, irregular, and contrived tacts containing the target relational autoclitic frame in order to determine if our MEI procedure would induce the abstraction of the frame across all stimulus sets. In the second experiment, additional tasks were introduced to the participants to control for a possible sequence effect. A nonconcurrent multiple probe design was used to evaluate the functional relation between MEI and emergence of untaught tact responses containing the comparative adjective "-er." The results of both experiments showed relations between MEI and novel, untaught tact responses containing the target autoclitic frame; the second experiment showing a functional relation. The results are discussed in terms of environmental sources for productive verbal behavior.