Section 7
Chapter 6,148

Positive conditioned suppression as a function of the percentage of conditioned stimulus unconditioned stimulus pairings

Levinson, M.; Meltzer, D.

Bulletin of the Psychonomic Society 10(2): 142-144


ISSN/ISBN: 0090-5054
Accession: 006147986

Two groups of 12 rats were trained to barpress on a variable-interval 2 min schedule of sucrose solution reinforcement. While responding on this schedule of reinforcement, the subjects were exposed to a classical conditioning contingency, in which an 8 s light CS [conditioned stimulus] terminated with the delivery of a food pellet US [unconditioned stimulus] on either 100 or 50% of the CS presentations. Comparisons of the response rate during the CS to the response rate prior to the CS revealed the suppression of CS rate was directly related to the probability of CS terminating with US.

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