Retraso en la adquisición simple EC-EI por inhibición del contexto en una tarea de condicionamiento apetitivo en ratas.
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2017-06-29
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Jaén: Universidad de Jaén
Resumen
El objetivo del presente estudio fue conocer qué papel desempeña el contexto en el
aprendizaje entre estímulos, en función de la historia previa de aprendizaje en dicho contexto.
En concreto, pensamos que la experiencia que tiene lugar en un contexto puede llevar a que
este adquiera propiedades excitatorias o inhibitorias que favorecerían, o dificultarían, el
aprendizaje posterior sobre un EC distinto. Para comprobar nuestra hipótesis realizamos un
experimento de condicionamiento apetitivo con ratas wistar. En un contexto determinado (A),
todos los animales tuvieron la misma experiencia –un estímulo (X) fue siempre seguido de una
consecuencia-. En otro contexto (B), la mitad de los animales recibieron un tratamiento similar
al recibido en el contexto A, pero con un estímulo diferente (Z). Para la otra mitad de los
animales, el estímulo Z nunca fue seguido de la consecuencia en el contexto B.
Posteriormente, en una nueva fase de entrenamiento, todos los animales recibieron el mismo
tratamiento; dos claves nuevas, Y y W, fueron siempre seguidas por la consecuencia en los
contextos A y B, respectivamente. Los resultados obtenidos apoyaron nuestra hipótesis inicial;
el contexto donde nunca apareció la consecuencia durante la primera fase dificultó el
aprendizaje posterior sobre W.
The objective about the present study was to know what role the context plays in learning between stimuli, when the context have a previous history of learning. In particular, we think that the experience about learning in a context may lead to acquire excitatory or inhibitory properties that would favor or hinder subsequent learning on a different SC. To test our hypothesis we performed an experiment of appetitive conditioning with wistar rats. In a context (A), all animals had the same experience - a stimulus (X) was always followed by a consequence. In another context (B), half of the animals received a treatment similar to that received in context A, but with a different stimulus (Z). For the other half of the animals, the Z stimulus was never followed by the consequence in context B. Subsequently, in a new training phase, all animals received the same treatment; Two new keys, Y and W, were always followed by the consequence in contexts A and B, respectively. The results obtained supported our initial hypothesis; The context where the consequence never appeared during the first phase made it difficult to learn later about W.
The objective about the present study was to know what role the context plays in learning between stimuli, when the context have a previous history of learning. In particular, we think that the experience about learning in a context may lead to acquire excitatory or inhibitory properties that would favor or hinder subsequent learning on a different SC. To test our hypothesis we performed an experiment of appetitive conditioning with wistar rats. In a context (A), all animals had the same experience - a stimulus (X) was always followed by a consequence. In another context (B), half of the animals received a treatment similar to that received in context A, but with a different stimulus (Z). For the other half of the animals, the Z stimulus was never followed by the consequence in context B. Subsequently, in a new training phase, all animals received the same treatment; Two new keys, Y and W, were always followed by the consequence in contexts A and B, respectively. The results obtained supported our initial hypothesis; The context where the consequence never appeared during the first phase made it difficult to learn later about W.