Variations in Unconditioned Stimulus Processing in Unblocking
| Autor: | Peter C. Holland, Cynthia Kenmuir |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Male
Conditioning Classical Experimental and Cognitive Psychology Stimulus (physiology) Amygdala Article Arousal Basal ganglia medicine Animals Rats Long-Evans Reinforcement Ecology Evolution Behavior and Systematics Appetitive Behavior Central nucleus of the amygdala Classical conditioning Neural Inhibition Feeding Behavior Rats medicine.anatomical_structure Conditioning Psychology Reinforcement Psychology Neuroscience |
| Zdroj: | Journal of Experimental Psychology: Animal Behavior Processes. 31:155-171 |
| ISSN: | 1939-2184 0097-7403 |
| Popis: | Three experiments examined the mechanisms by which downward shifts in reinforcer value influence learning in appetitive unblocking procedures. The downward shift was accomplished by omitting the second of a two-reinforcer sequence (food-food or food-sucrose). Performance of normal rats was compared with that of rats with lesions of the central nucleus of the amygdala, which are thought to interfere with surprise-induced enhancements of event processing. The results suggested that in normal rats, omission of the second reinforcer enhanced processing of the first reinforcer, rather than processing of the conditioned stimuli, and that lesions of the central nucleus eliminated this enhancement. The roles of reinforcement error signals in conditioning were discussed. |
| Databáze: | OpenAIRE |
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