Testing the validity of a non-associative theory of Pavlovian learning, Rate Estimation Theory (RET)
Abstract
Abstract: The current dissertation tested the validity of a non-associative account
of Pavlovian conditioning. Pavlovian conditioning involves the presentation of an
arbitrary stimulus (the CS) followed by a stimulus that elicits an innate response (the
US), such as food. After at least one presentation of the CS-US pairing, responding
begins to develop to the presentation of the CS alone (the CR). Associative theories
claim that the CR develops as a result of the association between the CS and the US
strengthening.
An alternative, non-associative account of Pavlovian conditioning, Rate
Estimation Theory (RET), has been proposed. In this theory, the CR develops when the
ratio of the rate of US occurrences during the CS presentation (T) exceeds the rate of US
occurrences when the subject is in the experimental environment (I) and the CS is absent
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by a specific amount, or a large I/T ratio. The present dissertation tested the validity of
RET.
In Experiments 1 and 2, RET’s claim that the order of occurrence of the context
exposure and the CS presentation do not affect the CR was tested. The results of these
tests indicated that, contrary to RET, the order of presentation of these components of the
conditioning trial did affect the CR. In Experiment 3, it was tested whether an alternative
type of CR, goal tracking, was elicited in a similar pattern as the CR described by RET.
RET only allows for one type of CR, sign tracking. The results indicated that the pattern
of goal tracking was not the same as the pattern of sign tracking.
Experiments 4, 5, and 6 tested the effect of the CS type on the development of the
CR. Contrary to RET’s prediction that the CS type has no effect on the CR, CSs of
higher visual salience elicited more approach responding to the CS than did less visually
salient CSs.
Contrary to RET’s claim that the I/T ratio is the sole determiner of the CR, the
results of the present experiments indicated that the order of presentation of the I and the
T, and the type of CS used affect the CR.
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