Robert Rescorla

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2 experiments indicate that CS-US contingency is an important determinant of fear conditioning and that presentation of US in the absence of CS interferes with fear conditioning. In Experiment 1, equal probability of a shock US in the presence and absence of a tone CS produced no CER suppression to CS; the same probability of US given only during CS(More)
Current thinking about Pavlovian conditioning differs substantially from that of 20 years ago. Yet the changes that have taken place remain poorly appreciated by psychologists generally. Traditional descriptions of conditioning as the acquired ability of one stimulus to evoke the original response to another because of their pairing are shown to be(More)
The purpose of this review is to bring to the attention of neuroscientists some of the current thinking of psychologists who study learning processes from a behavioral perspective. The past 20 years have seen enormous changes in the ways that psychologists conceptualize and study elementary learning processes; however, many of those changes are poorly(More)
The traditional control procedures for Pavlovian conditioning are examined and each is found wanting. Some procedures introduce nonassociative factors not present in the experimental procedure while others transform the excitatory, experimental CS-US contingency into an inhibitory contingency. An alternative control procedure is suggested in which there is(More)
Spontaneous recovery from extinction is one of the most basic phenomena of Pavlovian conditioning. Although it can be studied by using a variety of designs, some procedures are better than others for identifying the involvement of underlying learning processes. A wide range of different learning mechanisms has been suggested as being engaged by extinction,(More)
The history of 2-process learning theory is described, and the logical and empirical validity of its major postulates is examined. The assumption of 2 acquisition processes requires the demonstration of an empirical interaction between 2 types of reinforcement contingencies and (a) response classes, (b) reinforcing stimulus classes, or (c) characteristics(More)
Four experiments used a novel stimulus sequence to compare simultaneous and sequential associations among neutral stimuli in a sensory preconditioning procedure. In Experiments 1, 2, and 4, rats received a sequence of the form AB-B' in which A was simultaneous with B but sequential with B'. Subsequently, either B or B' was conditioned, and the response to A(More)
Five Pavlovian magazine approach experiments with rat subjects examined the mechanisms by which reconditioning restores extinguished responding. Experiments 1, 2, and 3 found that retraining did not destroy the spontaneous recovery with the passage of time that is characteristic of extinguished stimuli. Experiments 4 and 5 found evidence that retaining(More)