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   Instinctive drift or instinctual drift is the tendency of an animal to revert to instinctive behaviors that interfere with a conditioned response. The concept originated with B.F. Skinner's former students Keller Breland and Marian Breland when they tried to teach a raccoon to put tokens into a piggy bank.

   "The Brelands recognized that the phenomenon of instinctive drift contradicted 1950s-era reinforcement theory. The species-typical behaviors appeared even though they prevented a hungry animal from getting food reinforcement. That violated the laws of learning carefully built up over half a century. Those laws asserted that behaviors followed by food reinforcement should be strengthened, while behaviors that prevented food reinforcement should be eliminated."
 
Instinctive Drift | in Chapter 08: Animals | from Psychology: An Introduction by Russ Dewey. (n.d.). Retrieved January 9, 2016, from http://www.intropsych.com/ch08_animals/instinctive_drift.html

   "Observations by people like the Brelands helped to sway American psychologists toward the viewpoint of the ethologists. Researchers who used operant conditioning techniques began to explore the relevance of species-typical behaviors and to document the importance of taking the animal's natural tendencies into account. Nowadays, behavior psychologists who use reinforcement techniques are well aware that some types of behavior (those prepared by evolution) are easier to train than others.
 
Instinctive Drift | in Chapter 08: Animals | from Psychology: An Introduction by Russ Dewey. (n.d.). Retrieved January 9, 2016, from http://www.intropsych.com/ch08_animals/instinctive_drift.html

Note: Ethology is the scientific and objective study of animal behaviour rather than human behaviour and usually with a focus on behaviour under natural conditions, and viewing behaviour as an evolutionarily adaptive trait."