The development of functional and equivalence classes in high-functioning autistic children: the role of naming

A mediational theory of equivalence relations and transformation of function

In this article, we describe a mediational theory of emergent or derived relations resulting from matching-to-sample procedures that produce equivalence and transformation of function. According to a mediational theory, behaviors that occur at the time of reinforcement mediate subsequent behavioral relations referred to as "derived" or "emergent." Such relations have been documented for decades in studies using mostly matching-to-sample procedures with humans and nonhumans. In both verbal human and nonhuman participants, the mediating behaviors consist of differential responding to the sample stimulus. In humans, such behaviors are mostly, but not necessarily, verbal; in nonhumans they include a variety of sample-specific responses, sometimes called "coding." The proposed mediational theory, based only on the four-term contingency and the basic principles of operant learning, makes specific predictions and explains results from a broad range of experiments. There are at least three important implications of a mediational theory. First, if by "derived" or "emergent" one means untrained or unreinforced, then derived relations may not exist. Second, if there are no derived relations, then theories of such relations may not be necessary. Third, a mediational theory of relational responding has potentially important implications for clinical practice.

The Establishment of Incidental Bidirectional Naming through Multiple Exemplar Instruction: a Systematic Replication

Although many neurotypical children acquire untaught word-object relations incidentally from naturally occurring environmental experiences, many children with and without developmental disabilities require specific intervention. This study examined the effects of rotating listener (match and point) and speaker (tact and intraverbal-tact) responses with added echoics during multiple exemplar instruction (MEI) with training sets of stimuli on the acquisition of Incidental Bidirectional Naming (Inc-BiN). Listener-speaker MEI procedures reported in Hawkins et al. European Journal of Behavior Analysis, 10(2), 265-273, (2009) were replicated with procedural modification, new instructors, and new participants (four preschoolers with and without disabilities). The listener-speaker MEI with added echoics consisted of rotating across four response operants: match-with-echoics, point-with-echoics, tact, and intraverbal-tact responses. We measured the establishment of Inc-BiN through the number of the correct untaught listener (point) and untaught speaker (intraverbal-tact) responses for untaught stimuli during the listener-speaker MEI with added echoics. We found that listener-speaker MEI with added echoics was effective in establishing Inc-BiN for 3 of 4 participants.

Naming of Stimuli in Equivalence Class Formation in Children

In the present study, two typically developing 4-year-old children, Pete and Joe, were trained six conditional discriminations and tested for the formation of three 3-member equivalence classes. Pete and Joe did not establish the AC relation within 600 trials and were given two conditions of preliminary training, including naming of stimuli with two different stimulus sets. Pete started with preliminary training with common naming of stimuli, followed by conditional-discrimination training and testing for emergent relations, and continued with preliminary training on individual naming of stimuli, followed by the same training and testing as described previously. Joe experienced the same conditions but in reversed order. Pete responded in accordance with equivalence in the second round in the condition with common naming. In the first round of testing in the condition with individual naming, he responded in accordance with equivalence. In the condition with individual naming, Joe did not respond in accordance with stimulus equivalence but established all of the directly trained relations during training. In the condition with common naming, he responded in accordance with equivalence in the first round of testing. The results from the experiment support earlier findings that both common and individual naming could facilitate the emergence of equivalence classes.

Do common elements predict class merger: A test of Sidman's theory of equivalence

The study presented here investigated the effect of common and uncommon elements on class merger as predicted by Sidman in his reconceptualization of stimulus equivalence suggesting that common elements among contingencies can facilitate emergent performances (1994, 1997, 2000). Eight adult participants were exposed to a procedure that arranged for stimulus-reinforcer correlations in Phase 1 and response-reinforcer correlations in Phase 2 of a 3-phase study. In the common element group, the visual images serving as reinforcers were the same in Phase 1 and Phase 2. In the uncommon elements group, the images serving as reinforcers were different in Phases 1 and 2. In Phase 3, participants were given an opportunity to respond but no feedback was programmed. The results showed that participants' responding was well differentiated in the common element group and undifferentiated in the uncommon elements group. These results are predicted by Sidman's revised formulation of the provenance and scope of equivalence relations. Specifically, these data support Sidman's (1994, 1997, 2000) suggestion that elements of a contingency enter into an equivalence class and common elements among contingencies are sufficient to produce class mergers. The findings highlight an emergent simple discrimination and raise some interesting considerations about the definition of equivalence under the new formulation.

Using multiple-tact training to produce emergent visual categorization in children with autism

Previous research has shown that children with autism spectrum disorder (ASD) can categorize visual stimuli without direct training when they can also tact these stimuli using a common name and behave as listeners in relation to this name. However, children usually learn to assign objects specific names prior to learning the category to which they belong. The current study replicated previous research and evaluated whether multiple-tact training would establish visual categorization (measured by a picture sorting test) and listener behavior. We used a nonconcurrent multiple baseline design across 2 children with autism spectrum disorder. After multiple-tact training, we assessed whether participants would visually categorize stimuli based on their common category name. Both participants categorized and engaged in the corresponding listener behavior.

Deconstructing Common Bidirectional Naming: A Proposed Classification Framework

Conceptually, the use of the technical term naming appears to be a broad term that describes several subtypes of emergent verbal behavior. Miguel (The Analysis of Verbal Behavior, 32, 125-138, Miguel, 2016) introduces the concept of subtypes of naming, specifically common bidirectional naming and intraverbal bidirectional naming. He defines common bidirectional naming as "the process of different stimuli evoking the same speaker and listener behaviour and becoming members of the same class" (p. 130). A review of the literature on common bidirectional naming yielded some ambiguities related to differences in how researchers in the field defined naming. This article suggests that common bidirectional naming may be further dissected to yield six subtypes of naming. We aligned previous research on emergent verbal behavior with a unified taxonomy as part of a larger proposed classification framework on naming. The impact of identifying the subtypes of common bidirectional naming on skill acquisition and curriculum design is discussed. Finally, recommendations are made for future research based on this framework.

Talk-Aloud Protocols during Conditional Discrimination Training and Equivalence Class Formation

The primary focus of the present experiment was to study participants' self-talk during conditional discrimination training and test for the emergence of conditional relations consistent with equivalence. Eighteen adult participants were exposed to either a Many-to-One (MTO) or a One-to-Many (OTM) training structure arranged as a 6-s delayed matching-to-sample (DMTS) procedure. During training and testing, participants were asked to talk aloud. Each trial was divided into three time-windows for recording vocal responses. The first time-window was when the sample was presented, the second time-window was the delay following the offset of the sample stimulus until the onset of the comparisons, and the final time-window was when the comparison array was presented. Overall, participants in the OTM condition talked more than participants in the MTO condition. The participants exposed to MTO increased talking during the third time-window from last part of training to test more than the participants in the OTM condition. For 16 of the 18 participants, talking aloud was less than 55% in the second time-window (during the delay). Conversely, talking in the first and third time-windows were higher than 90% in both groups. Thus, it seems that talking is affected by the shift from training to testing to a greater degree when exposed to MTO than OTM. Furthermore, the data indicate that the participants did not need to talk aloud during the delay to respond correctly on DMTS trials.

Learning by exclusion in individuals with autism and Down syndrome

This study aimed to investigate the number of exclusion trials necessary for teaching auditory-visual relationships to individuals with autism and Down syndrome. Study participants were seven individuals with autism and a history of early behavioral intervention (EI), four adults with autism without a history of early behavioral intervention (NI), and three adults with Down syndrome. A set of procedures was used for teaching the auditory-visual matching to sample, and naming responses of the new stimuli were tested. For the individuals with autism and EI and for the individuals with Down syndrome, the required number of repetitions was stable and concentrated in the minimum programmed by the procedure (two repetitions). However, the procedure was not effective for teaching new conditional relationships for the adults with autism and NI. The results indicate that the procedure can constitute an important teaching technology; however, its efficacy appears to vary depending on the educational profile of the participant.

Variables affecting the emergence of untaught equivalence relations in children with and without autism

OBJECTIVE

This study examined the formation of equivalence classes among children with ASD and typically developing children.

DESIGN

A single-subject AB and BA design was used.

METHODS

Two of the six equivalence relations were taught. Participants were then tested to determine whether the remaining four equivalence relations were acquired without teaching. Half of the children were taught naming responses first, then selecting responses. Half were taught in the reverse order.

RESULTS

Five out of 10 participants with ASD demonstrated the emergence of all four untaught relations. The remaining five participants showed variability. Nine of the 10 typically developing children demonstrated emergence of all untaught relations. Variation in teaching conditions had no significant effect on outcomes.

CONCLUSIONS

Many children with ASD are capable of generalising to untaught equivalence relations. The results fail to support the claim that acquisition of naming responses is a pre-requisite for the emergence of untaught equivalence relations.

Intraverbal naming and equivalence class formation in children

Six typically developing children between 5 and 7 years of age underwent match-to-sample training to establish three-member equivalence classes after first acquiring a unique name for each stimulus. Horne and Lowe's (1996) naming hypothesis predicts that under those circumstances, match-to-sample training contingencies may establish intraverbal relations between the unique names, which in turn guide correct responses on a subsequent test for stimulus equivalence. Following training of baseline relations (AB and AC), participants received an equivalence test followed by an intraverbal test. Performance on the two tests co-varied, such that three participants passed both tests, and three participants failed repeated administrations of both tests, including a modified version of the equivalence test designed to promote intraverbal responding. The participants who failed the equivalence test, however, did so primarily due to poor performance in transitivity trials, but performed accurately in symmetry trials. After training of a third relation (BC), all three participants performed accurately in a symmetry test for the remaining untrained relations (BA, CA, and CB); two of them in the absence of relevant intraverbal repertoires.

Training Intraverbal Naming to Establish Matching-to-Sample Performances

The current study evaluated whether training intraverbal naming would be sufficient to establish visual-visual matching-to-sample (MTS) performances in college students. In the first experiment, we used a multiple-probe design across stimulus sets to assess whether six participants could match arbitrary visual stimuli (AB) after learning to tact their two experimentally defined classes (A' and B') and then intraverbally relate their names (i.e., "A' goes with B'"). All participants matched the stimuli accurately after training, as well as emitted the trained intraverbals. In the second experiment, we used a multiple baseline design across four participants to assess whether the same training would produce bi-directional intraverbals in the form of "B' goes with A'," and MTS performance consistent with symmetry (BA). All participants responded accurately during matching and intraverbal tests. Across both experiments, participants stated the trained intraverbals while performing the matching task. Results showed that MTS performance can be established solely by verbal behavior training.

An Investigation of Stimulus Pairing and Listener Training to Establish Emergent Intraverbals in Children with Autism

We examined two methods to facilitate the emergence of untaught intraverbal responses to children with autism. Listener behavior training (LT) involved reinforcement of a selection-based response following presentation of an array of pictures on an iPad® and an auditory instruction describing a characteristic of the picture. Stimulus pairing (SP) involved presentation of one picture in isolation on the iPad® and an auditory instruction describing a characteristic of the picture. Participants were not required to emit an overt vocal response during SP. Results indicate both procedures were effective at producing some untaught intraverbal responses, but a transfer of stimulus control procedure was required for two of the three participants to meet mastery criterion. Results are discussed in terms of necessary prerequisite skills for each procedure, and the requirement of an overt or echoic response to help facilitate the emergence of intraverbals.