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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.
11

An Evaluation of Negative Reinforcement During Error Correction Procedures

Maillard, Gloria Nicole 12 1900 (has links)
This study evaluated the effects of error correction procedures on sight word acquisition. Participants were four typically developing children in kindergarten and first grade. We used an adapted alternating treatment design embedded within a multiple baseline design to evaluate instructional efficacy of two error correction procedures; one with preferred items plus error correction and one with error correction only, and a concurrent chain schedule to evaluate participant preference for instructional procedure. The results show that there was no difference in acquisition rates between the procedures. The evaluation also showed children prefer procedures that include a positive reinforcement component.
12

Variabilidade comportamental reforçada negativamente sob contingência de esquiva / Behavioral variability negatively reinforced under an avoidance contingency

Fonseca Júnior, Amilcar Rodrigues 29 June 2015 (has links)
O presente trabalho teve como objetivo investigar se padrões variáveis de respostas podem ser instalados e mantidos por reforçamento negativo intermitente em um procedimento de esquiva em tentativas discretas. Seis ratos machos Wistar foram submetidos à modelagem e fortalecimento da resposta de pressão à barra com reforçamento positivo em uma caixa de condicionamento operante com duas barras (direita, D, e esquerda, E). Em seguida, essa resposta passou a ser reforçada negativamente em um procedimento de esquiva em tentativas discretas no qual um estímulo elétrico (US) de 0,5 s e 0,5 mA (em média) podia ocorrer ao final de um período de luz (CS). A emissão da resposta de pressão à barra durante o CS produzia o seu desligamento e um tom de 0,5 s e 10 Hz, cancelando o próximo US programado e iniciando um período de blackout sem qualquer contingência programada, após o qual um novo CS era apresentado. Duzentos US foram programados a cada sessão. O procedimento de esquiva se iniciou com reforçamento em FR 1 e FR 2 (com alternação das barras a cada 50 US programados). Posteriormente, sequências de três respostas foram reforçadas (com as duas barras disponíveis). Inicialmente, o reforçamento era contingente à variabilidade na emissão das sequências, avaliada pela disposição das respostas que as compõem entre as barras D e E: DDD, EED, DED etc. O variar foi reforçado de acordo com uma contingência Lag n, na qual apenas as sequências que diferiam das n anteriormente emitidas pelo sujeito evitavam o US, sendo o valor de n igual a 1, 2 ou 3. Uma vez que o desempenho se mostrou estável nessas fases, os sujeitos foram expostos ao procedimento Aco, no qual a distribuição de reforços foi acoplada àquela obtida na última sessão de Lag n, porém sem exigência de variação. Alguns sujeitos foram reexpostos à contingência Lag n após essa fase. Os resultados mostraram que todos os sujeitos apresentaram esquiva e altos índices variabilidade na emissão de sequências nas fases Lag n (medida pelo valor U), havendo queda sistemática desses índices sob o procedimento Aco. Os sujeitos reexpostos à Lag n mostraram recuperação dos altos índices de variação. Esses resultados sugerem que a variabilidade comportamental foi controlada pelo reforçamento negativo na contingência de esquiva proposta / This study aimed to investigate if variable patterns of responses can be acquired and maintained by intermittent negative reinforcement under a discrete-trial avoidance contingency. Six male Wistar rats were submitted to a lever-press response shaping session in an operant conditioning chamber with two levers (right, R, and left, L). Then, that response was negatively reinforced in a discrete-trial avoidance procedure in which a 0.5 s and 0.5 mA (average) shock (US) could occur after a light period (CS). Lever-press response emission during CS presentation turned off the CS, produced a 0.5 s and 10 Hz tone, canceled the next programmed US, and initiated a blackout period with no programmed contingency, after which a new CS was presented. Two hundred US were programmed per session. Initially, negative reinforcement occurred under FR 1 and FR 2 schedules (with levers alternation each 50 programmed US). Following, three response sequences were reinforced (with the two levers available). Reinforcement was contingent to behavioral variability, which was examined by comparing three-response sequences across R and L levers: RRR, LLR, RLR etc. Varying was reinforced according to a Lag contingency, in which only sequences that differed from n previous sequences avoided US (n was equal to 1, 2 or 3). After steady states were obtained in those contingencies, subjects were submitted to a yoke procedure, in which reinforcer distribution was yoked to the last Lag session, but without varying exigency. Some subjects were re-exposed to the Lag contingency after yoke procedure. Results showed that all the subjects avoided shocks and presented high levels of behavioral variability under the Lag contingency (measured by U value). During the yoke procedure, behavioral variability decreased systematically. Subjects that were re-exposed to the Lag contingency after yoke procedure recovered high levels of variation. These results suggest that behavioral variability was controlled by negative reinforcement under the proposed avoidance contingency
13

Investigação sobre o desamparo aprendido em humanos / Learned helplessness in humans

Samelo, Mariana Januario 22 July 2008 (has links)
A literatura sobre o desamparo aprendido utilizando humanos como participantes de pesquisa, tem encontrado dificuldades metodologicas. O presente experimento teve como objetivo geral estabelecer um procedimento que permitisse controle experimental suficiente para verificacao do efeito de uma historia de incontrolabilidade, com e sem feedback de erro, sobre a aprendizagem de uma nova resposta operante em sujeitos humanos. Estudantes universitarios foram divididos em quatro grupos (n=10), denominados Nao-tratado (N), Controlavel (C), Incontrolavel (I) e Incontrolavel feedback (If). Na primeira fase (tratamento), com excecao dos sujeitos do grupo N, os demais foram expostos a estimulos aversivos (som) que poderiam ser desligados contingentes ao seu comportamento de teclar sequencias variaveis (grupo C) ou independente dele (grupos I e If). No final da sessao, foi perguntado aos sujeitos a que atribuiam o termino do som: as respostas mostraram correspondencia entre a contingencia a qual estavam submetidos e o comportamento verbal para 100% dos participantes do Grupo C, 70% do Grupo If e 60% do Grupo I. Na segunda fase (teste), todos os participantes foram submetidos a resolucao de anagramas: os sujeitos dos grupos C e N apresentaram menores latencias e maior numero de acertos, sendo maiores as latencias e falhas obtidas no grupo If; o grupo I mostrou resultados intermediarios. Esses resultados sao consistentes com o esperado no estudo do desamparo aprendido, sugerindo que o procedimento proposto e adequado para esse estudo. Foram discutidas as contingencias acidentais que possivelmente se estabeleceram no grupo I, a funcao do feedback de erro no controle dessas contingencias, o controle pela regra e as implicacoes metodologicas do procedimento empregado. / The literature on learned helplessness in human has been fraught with methodological difficulties. The present research has the general objective of establishing a procedure that permits sufficient experimental control to verify the effect of a history of uncontrollability with or without feedback of failure on learning a new operant response by humans. College students were divided into four groups (n=10), deemed Non-treated (N), Controllable (C), Uncontrollable (I) and Uncontrollable with feedback (If). In the first phase (treatment), except for Group N, the participants were exposed to an aversive stimulus (tones) that could be controllable (i.e., turned off contingent upon making variable sequences using the keyboard) or independent of behavior (Groups I and If). At the end of the session, participants were asked to what they attributed the end of the tones: the correspondence between their answers and the situation to which they were exposed was 100% for Group C, 70% for Group If and 60% for Group I. In the second phase (test), all participants were asked to solve some anagrams. Groups C and N showed lower latencies and a greater number of correct responses. Latencies and rate of failure were higher in Group If; Group I presented intermediate results. These results were in agreement with the learned helplessness effect, suggesting that the procedure is adequate for its study. The possible accidental contingences established in Group I, the function of the feedback of failure in these accidental contingencies, the role of instructions and some methodological implications are discussed.
14

Investigação sobre o desamparo aprendido em humanos / Learned helplessness in humans

Mariana Januario Samelo 22 July 2008 (has links)
A literatura sobre o desamparo aprendido utilizando humanos como participantes de pesquisa, tem encontrado dificuldades metodologicas. O presente experimento teve como objetivo geral estabelecer um procedimento que permitisse controle experimental suficiente para verificacao do efeito de uma historia de incontrolabilidade, com e sem feedback de erro, sobre a aprendizagem de uma nova resposta operante em sujeitos humanos. Estudantes universitarios foram divididos em quatro grupos (n=10), denominados Nao-tratado (N), Controlavel (C), Incontrolavel (I) e Incontrolavel feedback (If). Na primeira fase (tratamento), com excecao dos sujeitos do grupo N, os demais foram expostos a estimulos aversivos (som) que poderiam ser desligados contingentes ao seu comportamento de teclar sequencias variaveis (grupo C) ou independente dele (grupos I e If). No final da sessao, foi perguntado aos sujeitos a que atribuiam o termino do som: as respostas mostraram correspondencia entre a contingencia a qual estavam submetidos e o comportamento verbal para 100% dos participantes do Grupo C, 70% do Grupo If e 60% do Grupo I. Na segunda fase (teste), todos os participantes foram submetidos a resolucao de anagramas: os sujeitos dos grupos C e N apresentaram menores latencias e maior numero de acertos, sendo maiores as latencias e falhas obtidas no grupo If; o grupo I mostrou resultados intermediarios. Esses resultados sao consistentes com o esperado no estudo do desamparo aprendido, sugerindo que o procedimento proposto e adequado para esse estudo. Foram discutidas as contingencias acidentais que possivelmente se estabeleceram no grupo I, a funcao do feedback de erro no controle dessas contingencias, o controle pela regra e as implicacoes metodologicas do procedimento empregado. / The literature on learned helplessness in human has been fraught with methodological difficulties. The present research has the general objective of establishing a procedure that permits sufficient experimental control to verify the effect of a history of uncontrollability with or without feedback of failure on learning a new operant response by humans. College students were divided into four groups (n=10), deemed Non-treated (N), Controllable (C), Uncontrollable (I) and Uncontrollable with feedback (If). In the first phase (treatment), except for Group N, the participants were exposed to an aversive stimulus (tones) that could be controllable (i.e., turned off contingent upon making variable sequences using the keyboard) or independent of behavior (Groups I and If). At the end of the session, participants were asked to what they attributed the end of the tones: the correspondence between their answers and the situation to which they were exposed was 100% for Group C, 70% for Group If and 60% for Group I. In the second phase (test), all participants were asked to solve some anagrams. Groups C and N showed lower latencies and a greater number of correct responses. Latencies and rate of failure were higher in Group If; Group I presented intermediate results. These results were in agreement with the learned helplessness effect, suggesting that the procedure is adequate for its study. The possible accidental contingences established in Group I, the function of the feedback of failure in these accidental contingencies, the role of instructions and some methodological implications are discussed.
15

Variabilidade comportamental reforçada negativamente sob contingência de esquiva / Behavioral variability negatively reinforced under an avoidance contingency

Amilcar Rodrigues Fonseca Júnior 29 June 2015 (has links)
O presente trabalho teve como objetivo investigar se padrões variáveis de respostas podem ser instalados e mantidos por reforçamento negativo intermitente em um procedimento de esquiva em tentativas discretas. Seis ratos machos Wistar foram submetidos à modelagem e fortalecimento da resposta de pressão à barra com reforçamento positivo em uma caixa de condicionamento operante com duas barras (direita, D, e esquerda, E). Em seguida, essa resposta passou a ser reforçada negativamente em um procedimento de esquiva em tentativas discretas no qual um estímulo elétrico (US) de 0,5 s e 0,5 mA (em média) podia ocorrer ao final de um período de luz (CS). A emissão da resposta de pressão à barra durante o CS produzia o seu desligamento e um tom de 0,5 s e 10 Hz, cancelando o próximo US programado e iniciando um período de blackout sem qualquer contingência programada, após o qual um novo CS era apresentado. Duzentos US foram programados a cada sessão. O procedimento de esquiva se iniciou com reforçamento em FR 1 e FR 2 (com alternação das barras a cada 50 US programados). Posteriormente, sequências de três respostas foram reforçadas (com as duas barras disponíveis). Inicialmente, o reforçamento era contingente à variabilidade na emissão das sequências, avaliada pela disposição das respostas que as compõem entre as barras D e E: DDD, EED, DED etc. O variar foi reforçado de acordo com uma contingência Lag n, na qual apenas as sequências que diferiam das n anteriormente emitidas pelo sujeito evitavam o US, sendo o valor de n igual a 1, 2 ou 3. Uma vez que o desempenho se mostrou estável nessas fases, os sujeitos foram expostos ao procedimento Aco, no qual a distribuição de reforços foi acoplada àquela obtida na última sessão de Lag n, porém sem exigência de variação. Alguns sujeitos foram reexpostos à contingência Lag n após essa fase. Os resultados mostraram que todos os sujeitos apresentaram esquiva e altos índices variabilidade na emissão de sequências nas fases Lag n (medida pelo valor U), havendo queda sistemática desses índices sob o procedimento Aco. Os sujeitos reexpostos à Lag n mostraram recuperação dos altos índices de variação. Esses resultados sugerem que a variabilidade comportamental foi controlada pelo reforçamento negativo na contingência de esquiva proposta / This study aimed to investigate if variable patterns of responses can be acquired and maintained by intermittent negative reinforcement under a discrete-trial avoidance contingency. Six male Wistar rats were submitted to a lever-press response shaping session in an operant conditioning chamber with two levers (right, R, and left, L). Then, that response was negatively reinforced in a discrete-trial avoidance procedure in which a 0.5 s and 0.5 mA (average) shock (US) could occur after a light period (CS). Lever-press response emission during CS presentation turned off the CS, produced a 0.5 s and 10 Hz tone, canceled the next programmed US, and initiated a blackout period with no programmed contingency, after which a new CS was presented. Two hundred US were programmed per session. Initially, negative reinforcement occurred under FR 1 and FR 2 schedules (with levers alternation each 50 programmed US). Following, three response sequences were reinforced (with the two levers available). Reinforcement was contingent to behavioral variability, which was examined by comparing three-response sequences across R and L levers: RRR, LLR, RLR etc. Varying was reinforced according to a Lag contingency, in which only sequences that differed from n previous sequences avoided US (n was equal to 1, 2 or 3). After steady states were obtained in those contingencies, subjects were submitted to a yoke procedure, in which reinforcer distribution was yoked to the last Lag session, but without varying exigency. Some subjects were re-exposed to the Lag contingency after yoke procedure. Results showed that all the subjects avoided shocks and presented high levels of behavioral variability under the Lag contingency (measured by U value). During the yoke procedure, behavioral variability decreased systematically. Subjects that were re-exposed to the Lag contingency after yoke procedure recovered high levels of variation. These results suggest that behavioral variability was controlled by negative reinforcement under the proposed avoidance contingency
16

Differential Treatment and Reinforcement

Fox, James J. 09 April 2015 (has links)
Book Summary: A teacher’s ability to manage the classroom strongly influences the quality of teaching and learning that can be accomplished. Among the most pressing concerns for inexperienced teachers is classroom management, a concern of equal importance to the general public in light of behavior problems and breakdowns in discipline that grab newspaper headlines. But classroom management is not just about problems and what to do when things go wrong and chaos erupts. It’s about how to run a classroom so as to elicit the best from even the most courteous group of students. An array of skills is needed to produce such a learning environment. The SAGE Encyclopedia of Classroom Management raises issues and introduces evidence-based, real-world strategies for creating and maintaining well-managed classrooms where learning thrives. Students studying to become teachers will need to develop their own classroom management strategies consistent with their own philosophies of teaching and learning. It is hoped that this work will help open their eyes to the range of issues and the array of skills they might integrate into their unique teaching styles.
17

The Restorative Effects of Smoking upon Self-Control Resources

Heckman, Bryan W. 09 September 2010 (has links)
Based on a model that considers self-control (SC) to be a limited resource, research suggests that diminished SC resources increase the likelihood of smoking. Yet, no study has evaluated how smoking affects SC resources. This study used a randomized, 2 x 2 crossed factorial (SC depletion manipulation X smoking manipulation), between-subjects design to test the hypothesis that smoking restores depleted SC resources. To manipulate SC depletion, half of the 132 dependent smokers were instructed to suppress their emotional reaction to a brief video depicting environmental damage (i.e., Depletion), whereas the other half were instructed to “act natural” (i.e., No Depletion) during viewing. Half of the participants in each condition then smoked a cigarette, whereas the other half sat patiently, without smoking (i.e., Smoke vs. No Smoke). All participants then completed two behavioral measures of SC (Mirror Tracing Performance Task: MTPT; and breath-holding). As hypothesized, a disordinal interaction occurred between the Depletion and Smoking manipulations for duration of time spent on the MTPT. That is, participants in the depletion condition showed less persistence on the MTPT, unless they were permitted to smoke. There was no evidence for mediation of this effect from the influence of smoking on affect and/or urge. Thus, smoking appeared to restore depleted SC resources, independent of its effects on self-reported affect and urge. Findings suggest that restoration of SC resources may represent another form of negative reinforcement from smoking that may play a role in nicotine dependence, and could inform treatment development.
18

Shaping Cows' Approach to Humans Using Positive and Negative Reinforcement

Morehead, Melissa L. 05 1900 (has links)
Negative reinforcement can be a powerful tool for behavior analysts, yet it is often overlooked as a treatment method. Pryor (1999) outlines a method for approaching a "timid" animal using a combination of negative reinforcement and positive reinforcement. When the animal stands still, the human operates a clicker, and then retreats from the animal. Gradually, the human moves closer to the animal through the clicking and retreating shaping process. Once the human is standing close enough, food may be offered as a positive reinforcer, and the negative reinforcer is canceled out. The purpose of this study was to experimentally demonstrate the click-retreat technique with cows. A multiple-baseline design across subjects was used to test this technique. Results show that the click and retreat technique was effective. Results are discussed in terms of the difference between the click-retreat technique and systematic desensitization.
19

The Effects of Contingency Type on Accuracy and Reaction Time

Adams, Owen James 08 1900 (has links)
Positive and negative reinforcement contingencies have been compared in terms of preference, but the differential effects of positive and negative reinforcement on reaction time and accuracy with other variables controlled remain unclear. Fifteen undergraduate students participated in a sound discrimination task that involved random mixed-trial presentations of positive and negative reinforcement contingencies. The participants' goal was to correctly identify whether the tone was shorter or longer than 600 milliseconds. On positive reinforcement trials, the participants received feedback and money tallies only if they identified the sound length correctly, with each correct response in the positive reinforcement trials earning the participant 10 cents. On negative reinforcement trials, the participants received feedback and money tallies only if they identified the sound length incorrectly, with incorrect trials subtracting 10 cents from the participants' total money (which began at $4.00 to equalize the weights of the positive and negative reinforcement contingencies). Accuracy analyses showed a relatively curvilinear relationship between the number of errors for each participant and the binned duration of the sound stimulus, with no differences across the positive and negative reinforcement conditions. Results also indicated weak linear negative correlations at the single subject level between comparison stimulus duration and reaction time, with similar slopes between positive and negative reinforcement trials, and strong curvilinear correlations at the group level, indicating differences between grouped and individual analyses. Overall our results appear to support abandoning the distinction between positive and negative reinforcement as two separate behavioral processes.
20

Behavioral Induction in Guinea Pigs as a Function of Reinforcement Magnitude in Multiple Schedules of Negative Reinforcement

Burns, Dennis L. 01 May 1975 (has links)
The purpose of this study was to examine the effects of changes in magnitude of negative reinforcement on multiple schedules with the guinea pigs. In both schedule components, the first response (lever press) after an average of 10 seconds was reinforced. In the constant component of this schedule the reinforcement magnitude (time-off from electric foot shock) was always 15 seconds; whereas, in the manipulated component the magnitude changed in the following sequence: 15, 7.5, 15, 30, and 15 seconds. All subjects showed a gradual decrease in response rate across baseline conditions. When behavioral effects were evaluated relative to this changing baseline, five of six subjects demonstrated that as the reinforcement magnitude decreased in one component, the response rates in both components decreased (negative induction). Likewise, when reinforcement magnitude increased in one component, all subjects showed behavioral induction. Specifically, three subjects showed increases in response rate in both components (positive induction), while two subjects showed decreases in response rate in v both components (negative induction). This research extends the generality of the behavioral induction phenomena on multiple schedules to in elude negative reinforcement with the guinea pig as a function of changes in reinforcement magnitude

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