Instinctive drift
Encyclopedia
Instinctive drift or instinctual drift is the tendency of an organism
Organism
In biology, an organism is any contiguous living system . In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole.An organism may either be unicellular or, as in the case of humans, comprise...

 to revert to instinctive behaviors that can interfere with the conditioned
Operant conditioning
Operant conditioning is a form of psychological learning during which an individual modifies the occurrence and form of its own behavior due to the association of the behavior with a stimulus...

 response. The concept originated with B. F. Skinner
B. F. Skinner
Burrhus Frederic Skinner was an American behaviorist, author, inventor, baseball enthusiast, social philosopher and poet...

's former students Keller and Marian Breland when they tried to teach a pig to put money into a piggy bank. Instead the pig instinctively drifted to it`s instinctive behaviour of putting the money on the ground, as they would do with food. . :
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