When Nora goes into a cupcake bakery, she is surrounded by cues associated with cupcakes. Her response elicited by these cues is to expect a very delicious dessert. When she waits until she gets home to eat the cupcake, that's exactly what she experiences. However, when she eats the cupcake at the bakery it is not as delicious as she predicted. Which concept can explain this phenomenon of cues reducing the strength of the unconditioned response (i. e. enjoyment of the cupcake)