Garcia and Koelling's studies of taste aversion in rats demonstrated that classical conditioning is constrained by

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Garcia and Koelling's studies showed that rats were biologically predisposed to develop an aversion to tastes associated with illness, even if there was a significant delay between the taste and the illness. This suggests that classical conditioning is constrained by biological factors, rather than simply cognitive processes or continuous reinforcement. There is no evidence to suggest that observational learning played a role in these studies.

Garcia and Koelling's Studies of Taste Aversion in Rats Demonstrated