Adaption -level phenomenon: this is the tendency to judge our experiences by comparing them to past experiences. For example, the book explains that as our income rises, or our social prestige improves we feel pleasure. But as time goes on, we adapt. What once felt good now feels just normal- and what was normal or neutral before now feels like deprivation. This phenomenon also entails our ability to judge our adaptive capacity. Often we underestimate our adaptive capacity. We have a hard time predicting the intensity and duration of our future positive and negative emotions.
In the movie Home Alone, Kevin (the main character) is at first very happy when he finds himself at home alone- with the house to himself. But as time goes on- the excitement lessens- and he finds himself missing his family.
In this movie Kevin thought he would be super happy being home alone- without his annoying family around. When Kevin is alone, the excitement of being home alone evaporates more rapidly than he had expected. In this situation- Kevin underestimated his adaptive capacity.