Extinction Instead of Incubation Following Classical Aversive Conditioning in Dogs

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Two dogs received a single paired classical conditioning trial, with tone CS and 12 mA shock US. Both dogs then showed a conditioned blood pressure increase in response to the nonreinforced CS, which extinguished with additional nonreinforced presentations. The CR showed spontaneous recovery four days later, but reextinguished with additional nonreinforced presentations. The results were interpreted as not supporting Eysenck’s theory of “incubation” following one-trial aversive conditioning.

Partial support for this study was provided by Grant 28462 from the National Heart, Lung, and Blood Institute.

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Integrative Psychological and Behavioral Science, v. 27, issue 4, p, 356-370