what is an example of an instinctive drift?
For example, a dog with the nature to bark at visitors thinking they are intruders might have been taught to sit quietly when a guest enters through reward and punishment. Under stress, however, it may have instinctual drift, disregarding the learned behavior and barking at the guest.
Instinctive drift is the tendency for biological constraints to return an animal to its natural instincts after operant conditioning. An example is the pigs who were trained to drop coins into a slot. Even after they were trained to perform this, they returned to their instincts of rooting for food and would no longer deposit the coins into a slot because it conflicted with their instincts. Instinctive drift interferes with operant conditioning.