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STIMULUS ASPECTS OF AVERSIVE CONTROLS: STIMULUS GENERALIZATION OF CONDITIONED SUPPRESSION FOLLOWING DISCRIMINATION TRAINING 1
Author(s) -
Hoffman Howard S.,
Fleshler Morton
Publication year - 1964
Publication title -
journal of the experimental analysis of behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 61
eISSN - 1938-3711
pISSN - 0022-5002
DOI - 10.1901/jeab.1964.7-233
Subject(s) - stimulus (psychology) , stimulus generalization , psychology , audiology , discrimination learning , neutral stimulus , stimulus control , neuroscience , developmental psychology , cognitive psychology , medicine , perception , nicotine
A tone ending with unavoidable electrical shock was periodically presented to pigeons while they pecked a key for food. A second group of birds was exposed to these tone‐shock contingencies and also to a second tone which never ended with shock. The gradient of stimulus generalization following training to a single stimulus was symmetrical, whereas the gradient following discrimination training was asymmetrical, but there was no evidence of peak shift. During testing, suppression to all tones gradually extinguished and in both groups the slope of the gradient increased markedly. A second experiment with the discrimination birds revealed that free shock caused a recovery of the gradient, but the asymmetry persisted.