Glossary / Lexicon
Instinctive drift
        Instinctive drift refers to an instance of classical conditioning in which a genetically based, fixed action  pattern gradually emerges and displaces a behavior that is being  operantly conditioned; the tendency for behavior to drift toward a Fixed action pattern.
Instinctive drift also refers to the substitution of instinctive behaviors for behaviors that had been reinforced.     
        
        
                                        