In their use of operant conditioning techniques to train animals from many species to perform various behaviors, the Brelands described instances of animal "misbehavior." They attributed this misbehavior to the

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The Brelands observed that trained animals would often revert to instinctual behaviors, a phenomenon they termed "instinctual drift." This suggests that despite training through operant conditioning, an animal's learned behaviors can drift back toward innate, instinctual patterns.

In Their Use of Operant Conditioning Techniques to Train Animals