Document Detail

The emergence of symmetry in a conditional discrimination task using different responses as propioceptive samples in pigeons.
MedLine Citation:
PMID:  16903493     Owner:  NLM     Status:  MEDLINE    
In Experiment 1, 10 pigeons were exposed to a successive symbolic matching-to-sample procedure in which the sample was generated by the pigeons' own behavior. Each trial began with both response keys illuminated white, one being the "correct" key and the other the "incorrect" key. The pigeons had no way of discriminating which key was correct and which incorrect, since these roles were assigned on a random basis with the same probability of 0.5 for each key. A fixed ratio of five responses was required on the correct key. However, each time the pigeon pecked the incorrect key, the correct key response counter reset. Five consecutive pecks on the correct key was the only way to end this component, and switch off both key lights. Two seconds later, these same keys were illuminated again, one green and the other red (comparison stimuli). Now, if the correct white key had been on the left, a peck at one color produced food, and if the correct white key had been on the right, a peck at the other color produced food. When the pigeons had learned this discrimination, they were exposed to several symmetry tests (simultaneous presentations of both keys illuminated the same color-i.e., both red or both green), in order to interchange the sample with the comparison stimuli. In Experiment 2, the importance of requiring discrimination between the samples and between the comparisons was analyzed. In Experiment 3, we compared the results of Experiment 1 with a slightly different experiment, which resulted in discrimination of key position, an exteroceptive stimulus. The results showed that symmetry emerged only when different responses were used as samples.
Andrés García; Santiago Benjumea
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the experimental analysis of behavior     Volume:  86     ISSN:  0022-5002     ISO Abbreviation:  J Exp Anal Behav     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-08-14     Completed Date:  2006-12-15     Revised Date:  2010-09-16    
Medline Journal Info:
Nlm Unique ID:  0203727     Medline TA:  J Exp Anal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  65-80     Citation Subset:  IM    
Departamento de Psicología Basica I, UNED, C/ Juan del Rosal, Madrid, Spain.
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MeSH Terms
Choice Behavior
Color Perception
Conditioning, Classical*
Discrimination Learning*
Probability Learning
Reinforcement Schedule

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