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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
121

An Application of Auditory Stimuli as Fading Prompts in Discrimination Training

Perlman, Neal S. 05 1900 (has links)
An experiment was conducted to examine the functionality of using auditory stimuli in isolation as fading stimuli. A review of the literature revealed very few reports regarding the usage of the auditory modality for fading purposes. The study employed auditory prompts as fading stimuli in the transfer of stimulus control across stimulus modalities, specifically, the transfer of stimulus control from auditory to visual stimulus properties. A single subject was employed for the experiment. The results were that the intensity of the auditory stimulus was an ineffective dimension to use for fading operations in the transfer of stimulus control across stimulus modalities, Further investigation is needed regarding the conditions that limit the transfer of stimulus control when auditory prompts are employed as fading stimuli.
122

An Evaluation of Matrix Training Approaches for Teaching Compound Labels to Toddlers

Wilshire, Tayla C. 05 1900 (has links)
Matrix training techniques arrange instruction for stimulus relations that facilitate emergent responding to novel stimulus arrangements, which is a phenomenon known as recombinative generalization. The current study compared two common matrix training approaches, an overlapping (OV) design and a non-overlapping (NOV) design, with respect to arranging relations targeted for training. Two, typically-developing toddlers were taught compound action-object labels in either an OV or NOV matrix training design. Results suggest that an OV matrix design facilitates recombinative generalization more effectively than a NOV design.
123

Further Evaluation of Blocked Trials to Teach Intraverbal Conditional Discriminations: Effects of Criterion-level Probes

Haggar, Jennifer Lynn 05 1900 (has links)
Individuals with autism often have deficient intraverbal repertoires. Previous research has found success in using a blocked trials procedure to facilitate discrimination training. A previous study (unpublished) from our laboratory extended this procedure to intraverbal training. The current study continued this line of research by exploring the outcomes of probing the criterion performance more frequently. Three children with autism, ages 7-13, participated. Eight question pairs were taught. One question was presented repeatedly until a specified number of consecutive correct responses occurred, then the other question was presented. Contingent on specific mastery criteria, the trial blocks were faded into smaller blocks until the questions were presented in quasi-random order. Between each step, a criterion probe was conducted to determine if further steps were necessary. The procedure has been successful for two of the three participants. Criterion probe performance showed that not all teaching steps were needed every time. The procedure may have facilitated acquisition over time, because the number of trials to mastery generally decreased over successive targets.
124

Controle por unidades mínimas na leitura: análise do desempenho de pré-escolares em treinos e testes de discriminações condicionais entre palavras ditadas e impressas / Control by minimal units during acquisition of reading: analysis of preschool children performance in trainings and tests of conditional discrimination between oral-printed words

Leite, Mariana Kerches da Silva 27 November 2008 (has links)
Os índices de evasão e fracasso escolar no ensino fundamental no Brasil, nos dias atuais, ainda são alarmantes. Torna-se importante o planejamento de procedimentos que minimizem as dificuldades envolvidas no aprendizado da leitura e escrita e potencializem a aquisição dessas habilidades. Nessa direção, vários grupos de pesquisadores têm focado seus estudos, através do paradigma de equivalência, visando identificar as variáveis relacionadas com a formação de classes de equivalência e suas relações com a leitura, trazendo nítidas implicações educacionais. Porém, quando a leitura com compreensão é adquirida, não significa necessariamente que o leitor esteja sob controle das unidades verbais menores do que a palavra. O presente estudo teve como objetivo investigar variáveis relevantes no processo da emergência do controle por unidades mínimas e, portanto, da leitura recombinativa, com cinco crianças pré-escolares. Foi utilizado o programa EQUIV, em que foram ensinadas as relações entre palavra ditada e palavra impressa correspondente (AC); em seguida testadas a leitura de novas palavras, formadas pela recombinação das unidades menores presentes nas palavras ensinadas previamente. O programa era constituído de vinte fases, que se dividiam em cinco tipos básicos de procedimentos: Pré-Teste, Pré-Treino, Treinos, Testes e Pós-testes. Os dados demonstraram que três participantes apresentaram desempenhos próximos de 100% nos Testes de Leitura Recombinativa, indicando transferência das funções discriminativas das unidades mínimas das palavras de treino para as novas palavras. Nos pós-testes todos os participantes foram capazes de nomear palavras e sílabas as quais não eram capazes de nomear anteriormente. Nos testes de Equivalência realizados ao final do programa, os mesmos três participantes obtiveram desempenhos próximos de 100%, o que indica leitura com compreensão. Os resultados do presente estudo indicam que a ausência dos treinos das relações entre palavra ditada e figuras (AB) e dos Testes de Equivalência, não impediram a emergência do controle por unidades mínimas, sugerindo um procedimento mais econômico para a obtenção da leitura recombinativa. Portanto, o ganho de se instalar o controle por unidades mínimas mais rapidamente, suscita questões teóricas e sugere pesquisas futuras nessa direção. / The percentage of drop outs in Brazilian primary school is still alarming. It is important, though, to arrange procedures that minimize difficulties in reading and writing and maximize the acquisition of these abilities. In this direction, many groups of researchers have focused in studies in which through equivalence paradigm they identify variables related with the formation of equivalences class and its relations with reading comprehension. But when reading comprehension is acquired, it does not necessarily means that the reader is under the control of minimal verbal units of the word. The present study aimed to investigate the relevant variables in the process of emergence of minimal unit control and recombinative reading, with five preschool children. Using EQUIV software, relations between oral and printed word (AC) were taught; afterwards, textual behavior of novel words were tested, which were composed by minimal units of the words taught previously. The program consisted of twenty experimental phases, divided into four basic types: Pretest, Pretraining, Training and Post- Test. The results showed that three participants presented recombinative reading closer to 100% correct performances, indicating transfer of discriminative functions of the minimal units trained to new words. In Post- Tests, all participants developed repertoire of naming oral words and syllables that werent able to name before. In Equivalence Tests applied in the final phase, the same three participants obtained performance closer to 100%, indicating reading comprehension. The results of the present study point that the absence of training relations between oral word and picture (AB) and Equivalence Tests, didnt inhibit the emergence of control by minimal units, suggesting economy in the procedures of recombinative reading. Hence, the quicker installment of minimal verbal units control than previous studies generates theoretical questions and suggests future researches in this direction.
125

Controle por unidades menores e leitura recombinativa : solicitação de comportamento textual durante aquisição de pré-requisitos / Control by minimal units and recombinative reading : textual behavior request during the acquistion of pre-requisits

Gomes, Renata Cristina 28 August 2007 (has links)
O objetivo do presente estudo foi verificar variáveis relevantes no ensino de leitura via o paradigma de equivalência, sobretudo na emergência do controle por unidades menores e leitura recombinativa. Por meio do software EQUIV foram ensinadas relações entre a palavra ditada e impressa (AC) e entre a palavra ditada e a respectiva figura (AB); em seguida eram testadas (1) as relações de equivalência entre figura-palavra impressa (BC) e palavra impressa-figura (CB), e (2) a leitura de novas palavras, formadas pela recombinação das unidades menores presentes nas palavras ensinadas previamente. A variável manipulada na presente pesquisa foi a solicitação para emissão de um comportamento textual nos treinos com tentativas AC. Oito crianças (quatro no grupo controle) participaram do programa, com 21 fases experimentais divididas em quatro tipos básicos: Pré-Teste , Pré-Treino, Treinos e Testes (04 palavras eram ensinadas, 08 ensinadas e testadas e 04 apenas testadas). Depois de aprenderem três conjuntos formados por quatro palavras (compostas por letras e sílabas sistematicamente recombinadas), os participantes mostraram aquisição de leitura com compreensão de palavras e sílabas, recombinação de unidades menores e leitura recombinativa em performances próximas de 100% de acertos. Os Pré e Pós-testes também mostraram que todos os participantes foram capazes de desenvolver o repertório de nomear palavras e sílabas as quais não eram capazes de nomear anteriormente. Entretanto, a comparação entre dois grupos (controle e experimental) sugeriu que a emissão de comportamento textual durante a tarefa não foi uma variável crítica sobre a emergência do controle por unidades menores e leitura recombinativa, já que os resultados foram estatisticamente semelhantes. Conclui-se que, conforme apontam os estudos prévios de Hübner e Hübner e Matos, o número de conjuntos de palavras treinado (o que envolve o treino de múltiplos exemplares) e a forma como as unidades menores que a palavra são recombinadas sistematicamente ao longo do procedimento são as variáveis mais importantes envolvidas na leitura recombinativa e no controle por unidades menores. / The objective of the present study was to verify relevant variables in the teaching of reading through equivalence paradigm, mainly in the emergence of the control by minimal units emergence and recombinative reading. Using the EQUIV software, relations between oral-printed word (AC) and between the oral word-picture were taught (AB). After that, were tested: (1) relations between picture-printed word (BC) and between printed word-picture (CB); and (2) the reading of novel words, which are composed by the minimal units of the words taught previously. The variable manipulated on the present research was a textual behavior request in the AC training trials. Eight children (four on control group) participated in the program, which consists of 21 experimental phases divided in four basic types: pre-test, pre-training, training and tests (04 words were taught, 08 words were taught and tested and 04 words were only tested). After learning three sets of 04 words (composed by letters and syllables systematic recombined), participants showed acquisition of reading comprehension with word and syllable, recombination of minimal units and recombinative reading in closer to 100% correct performances. Pretests and posttests showed that all participants developed the repertoire of oral naming words and syllables that they weren\'t able to name before. Nevertheless, comparison between the two groups suggested that textual behavior request wasn\'t a critical variable over the emergence of control by minimal units and recombinative reading, since both results are statistically similar. It seems to be, according to Hübner and Matos and Hübner previous studies, that the number of word sets trained (which involves multiple exemplars training) and the systematic recombination of minimal units used during procedure are the most important variables involved in recombinative reading and minimal units control.
126

Simple Color Discrimination in Autistic Subjects: Effect of Using a Single Stimulus as SD and Reinforcer

Ellis, Janet 05 1900 (has links)
A one-trial learning color discrimination task was extrapolated from Jarvik's (1953) teaching color discrimination to primates. A yellow-blue discrimination was selected to teach eleven autistic children. As in Jarvik's, SD and SA, reinforcer and punisher, were one and the same. Sugar-flavored water was the S D alum-flavored water, S . The instrumental response of reaching for a colored glass and drinking was established. Then one-trial learning occurred. The learning tests were a block of twenty-five trials for each individual subject on the following day. The second day another block of twenty-five trials was administered to each subject. It was hypothesized that the subjects would function at a ninety per cent criterion level. None of the subjects learned the task.
127

O efeito do autoclítico qualificador \"É\" em treinos de discriminação condicional e teste de equivalência de estímulos / Effect of qualifying autoclitic is in conditional discrimination training and stimulus equivalence test

Luis Antonio Lovo Martins 10 November 2014 (has links)
O efeito do reforçamento é apontado como a principal variável para a formação de discriminações condicionais e de equivalência de estímulos. Pesquisas têm se concentrado em analisar outras variáveis que influenciam a formação de discriminações condicionais e de equivalência de estímulos. Tais estudos sugerem que o comportamento verbal pode facilitar a formação do responder discriminativo e da equivalência de estímulos, porém poucas pesquisas tem se concentrado em investigar o efeito do comportamento verbal autoclítico neste responder. O objetivo da presente pesquisa foi analisar se uma instrução que orientou o participante a emitir uma resposta verbal vocal com autoclítico qualificador de asserção é, entre a apresentação do estímulo modelo e a escolha do estímulo amostra, em uma tarefa de matching to sample produz efeitos na formação de novas classes de equivalência e influencia na quantidade de tentativas necessárias para a formação do responder discriminativo condicional. Foram utilizados vinte participantes adultos divididos em dois grupos, Grupo Controle e Grupo Experimental. Todos os participantes foram submetidos a três etapas de treino e três etapas de testes. Na primeira etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada a formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3; na segunda etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada à formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3; na terceira etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada à formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3. Cada treino foi composto por doze tentativas, tendo como critério de aprendizagem a ocorrência de 100% de respostas corretas. A instrução foi apresentada apenas aos participantes do Grupo Experimental. Os resultados obtidos não apresentam diferenças de desempenho, entre os grupos na média de tentativas necessárias em todas as etapas de treino, entretanto o Grupo Experimental apresenta um desempenho inicial superior ao do Grupo Controle na média de respostas corretas nas Etapas de treino e um desempenho superior do Grupo Experimental na média de respostas corretas durante todas as etapas de teste do experimento. É possível afirmar que o efeito inicial do autoclítico foi de aumentar a precisão das respostas facilitando a aquisição da discriminação condicional e da formação de equivalência de estímulos. Tal precisão produzida pelo autoclítico pode ter auxiliado o participante a emitir um operante verbal intraverbal que descreve as discriminações condicionais ensinadas e testadas no experimento, já que todos os participantes do Grupo Experimental passaram a emitir a resposta verbal vocal este é este, acompanhado da resposta de escolha correta entre os estímulos condicional e discriminativo / The effect of reinforcement is pointed as the main variable for formation of conditional discrimination and stimulus equivalence. Researches have concentrated on analyzing other variables that influence the formation of conditional discrimination and stimulus equivalence. Such studies suggest that verbal behavior can facilitate formation of discriminative responding and stimulus equivalence, however few researches have focused on investigate the effect of autoclitic verbal behavior in this responding. The purpose of the present research was to analyze if an instruction that oriented the participant to emit a vocal verbal response, the autoclitic qualifier is, between the presentation of model stimulus and the choice of the sample stimulus in a task of match to sample, produces effects in formation of new equivalence classes and if it influences over the quantity of trials required to meet conditional discriminative responding. Twenty participants were dived in two groups, Control Group and Experimental Group. All the participants were submitted to three stages of training and three stages of tests. During the first stage of training the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 were trained and were tested the formation of equivalence classes between stimulus B1C1, B2C2, B3C3; on the second stage of training the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 and was tested the formation of equivalence classes between stimulus B1C1, B2C2, B3C3; on the third stage were trained the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 and tested the formation of equivalence classes between the stimulus B1C1, B2C2, B3C3. Each training was composed by twelve trials. The learning was 100% of correct. The instruction was presented just for the participants in Experimental Group. The results dont show differences in performance between groups in mean trials required at all stages of training, however, the experimental group has a higher initial performance of the control group in mean correct responses in steps training and superior performance the experimental group the average of correct responses during all phases of the test experiment. It can be argued that the initial effect of autoclitic was to increase the accuracy of responses by facilitating the acquisition of the conditional discrimination and stimulus equivalence training . Such precision produced by autoclitic may have helped the participant to issue a verbal operant intraverbal depicting taught conditional discriminations and tested in the experiment , as all participants in the experimental group started to emit vocal verbal response \" this is it\" , accompanied by the answer correct choice between conditional and discriminative stimuli
128

Controle por unidades mínimas na leitura: análise do desempenho de pré-escolares em treinos e testes de discriminações condicionais entre palavras ditadas e impressas / Control by minimal units during acquisition of reading: analysis of preschool children performance in trainings and tests of conditional discrimination between oral-printed words

Mariana Kerches da Silva Leite 27 November 2008 (has links)
Os índices de evasão e fracasso escolar no ensino fundamental no Brasil, nos dias atuais, ainda são alarmantes. Torna-se importante o planejamento de procedimentos que minimizem as dificuldades envolvidas no aprendizado da leitura e escrita e potencializem a aquisição dessas habilidades. Nessa direção, vários grupos de pesquisadores têm focado seus estudos, através do paradigma de equivalência, visando identificar as variáveis relacionadas com a formação de classes de equivalência e suas relações com a leitura, trazendo nítidas implicações educacionais. Porém, quando a leitura com compreensão é adquirida, não significa necessariamente que o leitor esteja sob controle das unidades verbais menores do que a palavra. O presente estudo teve como objetivo investigar variáveis relevantes no processo da emergência do controle por unidades mínimas e, portanto, da leitura recombinativa, com cinco crianças pré-escolares. Foi utilizado o programa EQUIV, em que foram ensinadas as relações entre palavra ditada e palavra impressa correspondente (AC); em seguida testadas a leitura de novas palavras, formadas pela recombinação das unidades menores presentes nas palavras ensinadas previamente. O programa era constituído de vinte fases, que se dividiam em cinco tipos básicos de procedimentos: Pré-Teste, Pré-Treino, Treinos, Testes e Pós-testes. Os dados demonstraram que três participantes apresentaram desempenhos próximos de 100% nos Testes de Leitura Recombinativa, indicando transferência das funções discriminativas das unidades mínimas das palavras de treino para as novas palavras. Nos pós-testes todos os participantes foram capazes de nomear palavras e sílabas as quais não eram capazes de nomear anteriormente. Nos testes de Equivalência realizados ao final do programa, os mesmos três participantes obtiveram desempenhos próximos de 100%, o que indica leitura com compreensão. Os resultados do presente estudo indicam que a ausência dos treinos das relações entre palavra ditada e figuras (AB) e dos Testes de Equivalência, não impediram a emergência do controle por unidades mínimas, sugerindo um procedimento mais econômico para a obtenção da leitura recombinativa. Portanto, o ganho de se instalar o controle por unidades mínimas mais rapidamente, suscita questões teóricas e sugere pesquisas futuras nessa direção. / The percentage of drop outs in Brazilian primary school is still alarming. It is important, though, to arrange procedures that minimize difficulties in reading and writing and maximize the acquisition of these abilities. In this direction, many groups of researchers have focused in studies in which through equivalence paradigm they identify variables related with the formation of equivalences class and its relations with reading comprehension. But when reading comprehension is acquired, it does not necessarily means that the reader is under the control of minimal verbal units of the word. The present study aimed to investigate the relevant variables in the process of emergence of minimal unit control and recombinative reading, with five preschool children. Using EQUIV software, relations between oral and printed word (AC) were taught; afterwards, textual behavior of novel words were tested, which were composed by minimal units of the words taught previously. The program consisted of twenty experimental phases, divided into four basic types: Pretest, Pretraining, Training and Post- Test. The results showed that three participants presented recombinative reading closer to 100% correct performances, indicating transfer of discriminative functions of the minimal units trained to new words. In Post- Tests, all participants developed repertoire of naming oral words and syllables that werent able to name before. In Equivalence Tests applied in the final phase, the same three participants obtained performance closer to 100%, indicating reading comprehension. The results of the present study point that the absence of training relations between oral word and picture (AB) and Equivalence Tests, didnt inhibit the emergence of control by minimal units, suggesting economy in the procedures of recombinative reading. Hence, the quicker installment of minimal verbal units control than previous studies generates theoretical questions and suggests future researches in this direction.
129

O efeito do autoclítico qualificador \"É\" em treinos de discriminação condicional e teste de equivalência de estímulos / Effect of qualifying autoclitic is in conditional discrimination training and stimulus equivalence test

Martins, Luis Antonio Lovo 10 November 2014 (has links)
O efeito do reforçamento é apontado como a principal variável para a formação de discriminações condicionais e de equivalência de estímulos. Pesquisas têm se concentrado em analisar outras variáveis que influenciam a formação de discriminações condicionais e de equivalência de estímulos. Tais estudos sugerem que o comportamento verbal pode facilitar a formação do responder discriminativo e da equivalência de estímulos, porém poucas pesquisas tem se concentrado em investigar o efeito do comportamento verbal autoclítico neste responder. O objetivo da presente pesquisa foi analisar se uma instrução que orientou o participante a emitir uma resposta verbal vocal com autoclítico qualificador de asserção é, entre a apresentação do estímulo modelo e a escolha do estímulo amostra, em uma tarefa de matching to sample produz efeitos na formação de novas classes de equivalência e influencia na quantidade de tentativas necessárias para a formação do responder discriminativo condicional. Foram utilizados vinte participantes adultos divididos em dois grupos, Grupo Controle e Grupo Experimental. Todos os participantes foram submetidos a três etapas de treino e três etapas de testes. Na primeira etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada a formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3; na segunda etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada à formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3; na terceira etapa foram treinadas as relações A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 e testada à formação de classes equivalência entre os estímulos B1C1, B2C2, B3C3. Cada treino foi composto por doze tentativas, tendo como critério de aprendizagem a ocorrência de 100% de respostas corretas. A instrução foi apresentada apenas aos participantes do Grupo Experimental. Os resultados obtidos não apresentam diferenças de desempenho, entre os grupos na média de tentativas necessárias em todas as etapas de treino, entretanto o Grupo Experimental apresenta um desempenho inicial superior ao do Grupo Controle na média de respostas corretas nas Etapas de treino e um desempenho superior do Grupo Experimental na média de respostas corretas durante todas as etapas de teste do experimento. É possível afirmar que o efeito inicial do autoclítico foi de aumentar a precisão das respostas facilitando a aquisição da discriminação condicional e da formação de equivalência de estímulos. Tal precisão produzida pelo autoclítico pode ter auxiliado o participante a emitir um operante verbal intraverbal que descreve as discriminações condicionais ensinadas e testadas no experimento, já que todos os participantes do Grupo Experimental passaram a emitir a resposta verbal vocal este é este, acompanhado da resposta de escolha correta entre os estímulos condicional e discriminativo / The effect of reinforcement is pointed as the main variable for formation of conditional discrimination and stimulus equivalence. Researches have concentrated on analyzing other variables that influence the formation of conditional discrimination and stimulus equivalence. Such studies suggest that verbal behavior can facilitate formation of discriminative responding and stimulus equivalence, however few researches have focused on investigate the effect of autoclitic verbal behavior in this responding. The purpose of the present research was to analyze if an instruction that oriented the participant to emit a vocal verbal response, the autoclitic qualifier is, between the presentation of model stimulus and the choice of the sample stimulus in a task of match to sample, produces effects in formation of new equivalence classes and if it influences over the quantity of trials required to meet conditional discriminative responding. Twenty participants were dived in two groups, Control Group and Experimental Group. All the participants were submitted to three stages of training and three stages of tests. During the first stage of training the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 were trained and were tested the formation of equivalence classes between stimulus B1C1, B2C2, B3C3; on the second stage of training the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 and was tested the formation of equivalence classes between stimulus B1C1, B2C2, B3C3; on the third stage were trained the relations A1B1, A2B2, A3B3 e A1C1, A2C2, A3C3 and tested the formation of equivalence classes between the stimulus B1C1, B2C2, B3C3. Each training was composed by twelve trials. The learning was 100% of correct. The instruction was presented just for the participants in Experimental Group. The results dont show differences in performance between groups in mean trials required at all stages of training, however, the experimental group has a higher initial performance of the control group in mean correct responses in steps training and superior performance the experimental group the average of correct responses during all phases of the test experiment. It can be argued that the initial effect of autoclitic was to increase the accuracy of responses by facilitating the acquisition of the conditional discrimination and stimulus equivalence training . Such precision produced by autoclitic may have helped the participant to issue a verbal operant intraverbal depicting taught conditional discriminations and tested in the experiment , as all participants in the experimental group started to emit vocal verbal response \" this is it\" , accompanied by the answer correct choice between conditional and discriminative stimuli
130

Nonidentity Matching-to-Sample with Retarded Adolescents: Stimulus Equivalences and Sample-Comparison Control

Stromer, Robert 01 May 1980 (has links)
In Experiment 1, four subjects were trained to match two visual samples (A) and their respective nonidentical visual comparisons (B); i.e., A-B matching. During nonreinforced test trials, all subjects demonstrated stimulus equivalences within the context of sample-comparison reversibility (B-A matching): When B stimuli were used as samples, appropriate responding to A comparisons occurred. A-B and B-A matching persisted given novel stimuli as alternate comparisons. However, the novel comparisons were consistently selected in the presence of nonmatching stimuli: i.e., during trials comprised of a novel comparison, an A or B sample from one stimulus class, and an "incorrect" comparison from the other, B or A stimuli respectively. In Experiment 2, three groups of subjects were trained under three different mediated transfer paradigms (e.g., A-B, C-B matching). Tests for reversibility (e.g., B0A, B0C matching) and mediated transfer (e.g., A-C, C-A matching)evinced stimulus equivalences for 11 of 12 subjects. The 11 subjects also matched the mediated equivalences given novel comparisons; whereas, they selected the novel comparisons when combined with nonmatching stimuli. Overall, the demonstrated stimulus equivalences favor a concept learning interpretation of non-identity matching-to-sample. Additionally, the trained and mediated matching relations were comprised of complementary sets of S+ and S- rules: Any stimulus of a given class used as a sample designated both the "correct" and "incorrect" comparisons.

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