Molly attempts to condition her puppy to greet her when she enters the house. She repeatedly pairs her entry to the house with a treat for the puppy. The puppy eventually acquires this ability, but then Molly realizes how irritating it is for the puppy to run up to her every time she enters the house. Molly stopped giving the puppy treats, and eventually the puppy no longer jumps on her when she walks in the door. The puppy no longer greeting her when she enters the house is an example of ________.