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The current experiment assessed whether relating abstract stimuli with familiar pictures by exclusion would produce the formation of a meaningful equivalence class. Ten participants learned conditional discrimination relations with abstract stimuli and established equivalence classes (ABC classes). They then learned DA (D1A1, D2A2, and D3A3) conditional discriminations with written words as D stimuli; two words (D1 and D2) were meaningful stimuli in the participants verbal community ("Dentist" and "Baker"), whereas the third (D3) was a pseudoword ("Tabilu"). In testing trials, participants evidenced derived relations between pictures related preexperimentally to D1 and D2 with the experimental equivalence classes related to D1 and D2. For some participants, the decontextualized stimuli were a set of boat pictures (Condition 1), whereas for others they were a set of miscellaneous pictures (Condition 2). Participants in both conditions successfully matched decontextualized pictures (unrelated to dentist and baker contexts) to all abstract stimuli in the class related to D3 (exclusion responding). In Condition 1 the meaning reported to the word Tabilu was similar across participants, but in Condition 2 participants showed more variations to answer to the meaning of Tabilu. These results suggest that exclusion learning can occur under different stimulus control topographies.

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Delayed matching to sample (DMTS) increases the probability of equivalence class formation. Precurrent responses can mediate the retention interval in DMTS trials and control the selection of comparisons. In human participants, precurrent responses usually consist of naming the experimental stimuli based on their similarities to meaningful stimuli with preexperimental history. We tested whether precurrents expand classes by serving as nodes between experimental and meaningful stimuli. A DMTS (2 s) was used throughout the entire experiment. Eleven undergraduates learned A1B1 and A2B2 relations and then were submitted to ArC trials that required them to answer math problems presented during the DMTS interval: when the sample was A1, the problems resulted in 12 and C1 was correct; when the sample was A2, they resulted in 9 and C2 was correct. Response-as-node tests assessed whether participants would relate B1 and C1 to the printed number 12 and B2 and C2 to the printed number 9. Ten participants responded accordingly to this pattern, showing that the responses to the problems expanded the classes. Parity tests using the words "even" and "odd" further confirmed this hypothesis. These results contribute to understanding why DMTS enhances equivalence performances. Implications of using this procedure in stimulus-equivalence studies are discussed.

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Empirical evidence has supported that musical excerpts written in major and minor modes are responsible for evoking happiness and sadness, respectively. In this study, we evaluated whether the emotional content evoked by musical stimuli would transfer to abstract figures when they became members of the same equivalence class. Participants assigned to the experimental group were submitted to a training procedure to form equivalence classes comprising musical excerpts (A) and meaningless abstract figures (B, C, and D). Afterward, transfer of function was evaluated using a semantic differential. Participants in the control group showed positive semantic differential scores for major mode musical excerpts, negative scores for minor mode musical excerpts, and neutral scores for the B, C, and D stimuli. Participants in the experimental groups showed positive semantic differential scores for visual stimuli equivalent to the major modes and negative semantic differential scores for visual stimuli equivalent to the minor modes. These results indicate transfer of function of emotional content present in musical stimuli through equivalence class formation. These findings could provide a more comprehensive understanding of the effects of using emotional stimuli in equivalence class formation experiments and in transfer of function itself.

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A formação de classes de estímulos equivalentes tem sido considerada um modelo para o estabelecimento de relações simbólicas, ou do significado, contribuindo para o ensino de leitura e escrita. O presente estudo teve como objetivo avaliar os efeitos de um módulo de ensino de um programa informatizado de leitura e escrita em crianças com deficiência intelectual matriculadas em uma escola regular. Participaram três alunos com idades entre 8 e 10 anos. O programa de ensino era aplicado na própria escola, duas a três vezes por semana, individualmente, com sessões de aproximadamente 35 minutos. Foi empregado uma avaliação geral de leitura e escrita antes e após o programa. Os resultados mostraram que quanto melhor o repertório de entrada, mais rapidamente os participantes avançaram no módulo e melhoraram seus repertórios de leitura e escrita. A realização dessa intervenção nas séries iniciais pode contribuir na aprendizagem de repertórios básicos de leitura e escrita.

The formation of stimulus equivalence classes has been considered a productive model of symbolic relations ­ or meaning ­ for teaching reading and writing. This study aimed to evaluate the effects of one module of a computerized reading and writing program for children with intellectual disabilities enrolled in a regular school. Three students aged between 8 and 10 participated in the study. The program was applied individually to each participant in the school premises across two to three weekly sessions of approximately 35 minutes each. General assessment was applied as a pre and post-test. The results showed that the better the participants' existing repertoires, the faster they advanced in the procedure and improved their reading and writing skills. Conducting this intervention in early school years can contribute to the process of leaning basic reading and writing

La formación de clases de estímulo equivalentes se ha considerado un modelo para el establecimiento de relaciones simbólicas, contribuyendo a la enseñanza de la lectura y escritura. El estudio tuvo como objetivo evaluar los efectos de un módulo didáctico de un programa computarizado de lectura y escritura en niños con discapacidad intelectual matriculados en una escuela regular. Participaron tres estu diantes de entre 8 y 10 años. El programa de enseñanza se aplicó en la escuela, de dos a tres veces por semana, de manera individual, con sesiones de aproximadamente 35 minutos. Se utilizó una evaluación general de lectura y escritura antes y después del programa. Los resultados mostraron que cuanto mejor era el repertorio de entrada, más rápido avanzaban los participantes en el módulo y mejoraban su repertorio. La realización de esta intervención en los grados iniciales puede contribuir al aprendizaje de los repertorios básicos de lectura y escritura.

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Dados quantitativos revelam diferenças entre negros e não negros em relação à violência no Brasil, e esse fato abre espaço para discutir o racismo. Autores apontam que há necessidade de levar em consideração aspectos históricos, como o escravismo, para compreender a situação atual do fenômeno. Este estudo teve como objetivo discutir a contribuição da Análise do Comportamento, por meio de seus estudos, para a construção de comportamentos não racistas. Realizou-se busca nos Periódicos Capes, e selecionaram-se estudos produzidos nos últimos 20 anos (2000-2020) que contivessem as palavras de busca racism, racial e Behavior Analysis. Os estudos discutiam sobre ferramentas para mensuração de viés racial implícito e também formas de intervenção. Conclui-se que a Análise do Comportamento, embora seja uma ciência eficaz para mudança de comportamento, ainda precisa aumentar sua produção sobre o racismo.

Quantitative data has been revealing differences between blacks and non-blacks regarding violence in Brazil. This fact opens space to discuss racism. Authors have been pointing out that there is a need to consider historical aspects, such as slavery, to understand the current stage of the phenomenon. This study aimed to discuss the contribution of Behavior Analysis, through its studies, to the construction of non-racist behaviors. Having the last 20 years as a time frame (2000-2020), a search and a selection of studies that contained the keywords Racism, Racial, and Behavior Analysis were carried out in the CAPES Journals database, from Brazil. The found studies discussed tools for measuring implicit racial bias as well as ways of intervention. It was concluded that Behavior Analysis, although an effective science for behavior change, still needs to increase its production on racism.

Datos cuantitativos han revelado diferencias entre negros y no negros con respecto a la violencia en Brasil. Esta realidad abre espacio para discutir el racismo. Autores vienen señalando que es necesario considerar aspectos históricos, como la esclavitud, para comprender el escenario actual del fenómeno. Este estudio tuvo como objetivo discutir la contribución del Análisis del Comportamiento, a través de sus pesquisas, a la construcción de conductas no racistas. Se realizaron una búsqueda y selección de estudios que contenían las palabras clave racism, racial y Behavior Analysis, en la base de datos Periódicos Capes, de Brasil, escritos en los últimos 20 años (2000-2020). Los estudios encontrados discutieron herramientas para medir el sesgo racial implícito, así como formas de intervención. Se llegó a la conclusión de que el Análisis del Comportamiento, aunque es una ciencia eficaz para el cambio de conductas, todavía necesita aumentar su producción sobre el racismo.

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Enquanto ciência, a Análise do Comportamento tem tecnologia para estudar práticas culturais relacionadas a questões raciais. O objetivo deste estudo foi aplicar uma dessas tecnologias e avaliar os efeitos produzidos por um procedimento de redução de viés racial negativo em relação a pessoas pretas. Foram selecionados 17 participantes, pretos e brancos, que preencheram um questionário de autodeclaração e foram avaliados pelo Implicit Relational Assessment Procedure (IRAP) para definição de linha de base. Por meio de um procedimento de matching-to-sample (MTS), foram treinadas três rela-ções entre estímulos: (a) polegares/figuras abstratas; (b) figuras abstratas/pessoas pretas e figuras abstratas; e (c) relações anteriores simultâneas. Ao término de cada treino, foram realizados testes de simetria, transitividade e equivalência. Utilizou-se novamente o IRAP, para verificar mudanças após o treino. Os resultados indicaram que as respostas dos participantes na linha de base não mostraram viés negativo para pessoas pretas mas, após o treino, houve mudança significativa para participantes brancos. Recomenda-se que pesquisas futuras testem as características do experimentador e outras formas de detecção de viés racial implícito. (AU)

As a science, behavior analysis has technology to study cultural practices related to racial issues. The purpose of this study was to assess the effects produced by a procedure aimed to reduce negative racial bias towards black people. Seventeen black and white participants were selected after fulfilling a self-declaration questionnaire and being assessed by Implicit Relational Assessment Procedure (IRAP), in order to set a baseline. Then, three relations were trained using matching-to-sample (MTS): (a) thumbs/abstract figures; (b) abstract figures/ black people and abstract figures; and (c) simultaneous prior relations. Symmetry, transitivity and equivalence tests were performed at the end of each training, and IRAP was used again to assess changes after the procedure. Results indicated that participants were not negatively biased towards black people and, after the procedure, only white participants showed significant change. We recommended future studies to test the effects of the researcher's characteristics as well as other ways to detect implicit racial bias. (AU)

Como ciencia, el análisis del comportamiento tiene tecnología para estudiar prácticas culturales relacionadas con cuestiones raciales. El propósito de este estudio fue evaluar los efectos producidos por un procedimiento destinado a reducir el sesgo racial negativo con relación a personas negras. Diecisiete participantes blancos y negros fueron seleccionados después de completar un cuestionario de autodeclaración y de ser evaluados por Implicit Relational Assessment Procedure (IRAP), con el fin de establecer una línea de base. Despues, se entrenaron tres relaciones utilizando matching-to-sample (MTS): (a) pulgares/figuras abstractas; (b) figuras abstractas /personas negras y figuras abstractas; y (c) relaciones previas simultáneas. Las pruebas de sime-tría, transitividad y equivalencia fueran realizadas al final de cada entrena-miento, y el IRAP fue nuevamente usado para evaluar los cambios después del procedimiento. Los resultados indicaron que los participantes no tenían sesgo negativo con relación a personas negras y, después del procedimiento, solo los participantes blancos mostraron un cambio significativo. Recomendamos futuros estudios para evaluar los efectos de las características del investigador, así como otras formas de detectar el sesgo racial implícito. (AU)

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The use of two choices in the matching-to-sample (MTS) procedure has been discouraged in the literature because it may lead to "reject control," resulting in failures to establish equivalence classes. In the present study, reject control was prevented during training with the two-choice MTS procedure by presenting the correct comparison with one of five possible incorrect comparisons across trials. This procedure was compared to a six-choice MTS procedure, in which these same six comparison stimuli were presented simultaneously across trials. In Experiment 1, conditional discrimination training and emergent relations testing maintained the same number of comparison choices, two or six. Experiment 2 assessed whether training with two or six choices would result in successful tests under a different configuration from the one with which training occurred (i.e., six or two choices, respectively). In Experiment 3, the conditions were the same as in Experiment 2, but minimal instructions were given to the participants. The results showed the establishment of equivalence classes in all test conditions, thus demonstrating success of the different training conditions. The two-choice MTS procedure appears to be at least as effective as the six-choice procedure for training conditional relations and establishing equivalence classes.

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The present experiments evaluated the effect of meaningful stimuli on the inclusion of a set of extra-experimental meaningful pictures into equivalence classes using within- and between-subjects designs. There were 35 adult participants in total (NEXP1 = 22; NEXP2 = 13). In both experiments, participants were first trained on six baseline relations with abstract stimuli (A, B, and C) and assessed on the emergence of three 3-member equivalence classes. Next, they were trained on DA relations and assessed on the inclusion of the D stimuli and a set of meaningful pictures in the equivalence classes. In Experiment 1, D1 and D2 were meaningful written words and D3 was a written pseudoword. In Experiment 2, for 2 groups, D1, D2, and D3 were meaningful words; for another group, D1, D2, and D3 were pseudowords. In both experiments, participants formed the ABC classes and included the D stimuli in the classes. When D was a meaningful word, participants also included a set of pictures potentially related to the word in the ABC class established experimentally. The results have implications for the definition of meaningfulness and contribute to discussions on the impact of test arrangements on emergent responding.

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O presente artigo tem por objetivo descrever as características dos participantes de estudos empíricos que tratam da equivalência de estímulos e ensino de leitura, entre os anos de 2008 a 2017. Foram analisados artigos completos localizados nas bases de dados Periódicos CAPES e PEPSIC, por meio de busca combinada de descritores de equivalência de estímulos e leitura, selecionados a partir de estudos anteriores. Localizaram-se nas bases de dados dezenove artigos que compuseram o estudo. Observou-se que a escola é o local em que mais ocorreram estudos, realizados em sua maioria com crianças de desenvolvimento típico, não leitoras, com faixa etária predominante de seis a sete anos. Sobre o nível de escolaridade dos participantes pode-se identificar que a maioria se encontrava no ensino fundamental, com destaque aos 2° e 3° anos; além disso, foi identificado um estudo com alunos do Ensino Médio. Chama-se atenção à multiplicidade de característica dos participantes (deficiência auditiva, física, intelectual), característica esta vista como positiva e necessária de acordo com os pesquisadores. Sugere-se para estudos futuros ampliação da busca em outros bancos de dados nacionais e internacionais, além da descrição dos procedimentos adotados e resultados obtidos nos diferentes públicos. (AU)

This paper describes the characteristics of the participants of empirical studies dealing with the stimulus equivalence and reading teaching between the years 2008 and 2017. Scientific papers from CAPES and PEPSIC periodical database were analyzed through a combined search of stimulus equivalence and reading descriptors, selected from previous studies. Nineteen articles that composed the study in the databases. It was observed that the school is the place where most studies took place, mostly with children of typical development, non-readers, ranging from six to seven years. Regarding the educational level of the participants, the majority was in elementary school, mainly on the 2nd and 3rd years; and also a high school. It is important to highlight the multiplicity of the participants (hearing and physical impairment and intellectual disability), which is a trend understood as positive and necessary to the researchers. It is suggested, for future studies, to expand the search to national and international databases, besides the description of the adopted procedures and results obtained with different subjects. (AU)

El presente artículo tiene por objetivo describir las características de los participantes de estudios empíricos que tratan de la equivalencia de estímulos y enseñanza de lectura entre los años 2008 y 2017. Se analizaron artículos completos, de las bases de datos "Periódicos CAPES" y "PEPSIC", por medio de la búsqueda combinada de descriptores de equivalencia de estímulos y lectura, seleccionados a partir de estudios anteriores. Se localizaron, en las bases de datos, diecinueve artículos que compusieron el estudio. Se observó que la escuela es el lugar en que más ocurrieron estudios, realizados en su mayoría con niños de desarrollo típico, no lectores, con rango de edad predominante entre los seis y siete años. Sobre el nivel de escolaridad de los participantes, se puede identificar que la mayoría se encontraba en la enseñanza fundamental, con destaque a los 2° y 3° años; además, se identifico un estudio con alumnos de la enseñanza media. Se destaca la multiplicidad de característica de los participantes (discapacidad auditiva, física, intelectual), que es una tendencia comprendida como positiva y necesaria a los ojos de los investigadores. Se sugiere, para estudios futuros, ampliación de la búsqueda en otros bancos de datos nacionales e internacionales, además de la descripción de los procedimientos adoptados y resultados obtenidos en los diferentes públicos. (AU)

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BACKGROUND: The emergent categorization involving paintings by renowned painters and their corresponding names was demonstrated by previous studies. However, the results of these studies suggest that the colors of the pictures may have played a preponderant role, obscuring other aspects of the stimuli that could be more directly related to the style of each painter. To verify this possibility, the present study used the same methodology of Ferreira et al. to investigate the establishment of emergent conditional relations between categories composed of black and white paintings and the names of their authors. METHOD: The procedure consisted of the training of relations between each of the ten paintings and an abstract picture, for each of the three painters Botticelli, Monet, and Picasso. Relations between each of the three abstract figures and the printed name of one of the painters were verified in sequence. Finally, tests of relations between five trained and five untrained paintings of each artist and the printed names were conducted. RESULTS: The participants' performance suggests that the outcome was properly controlled by aspects pertinent to the paintings that belonged to each painter's category. CONCLUSIONS: The results reinforced the data obtained previously with colored pictures, suggesting that the process of emergent categorization involving artificial categories of paintings is robust. It also indicates possibilities for future investigations, for example, using stimuli of other artistic productions, such as sculpture and music.