Critics view the hedonic adaptation tendency as a generalization that fails to take potentially shifting factors into account.
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... also referred to as hedonic treadmill, is defined as "the observed tendency of humans to quickly return to a relatively stable level of happiness despite major positive or negative events or life changes" - Positive Psychology Program.
After a while, people become used to changes in their lives. The enjoyment or unhappiness that follows certain life events gradually wears off, returning each person to their "default" emotional state.
People become used to whatever changes are causing their increase in happiness. Over time, the initial excitement of the thing that happened wears off with a return to the "set level of happiness."
Someone who undergoes a positive experience with desirable offshoots can shift their levels of expectation. It then becomes their new normal.
The process of hedonic adaptation can be minimized, if not eliminated.
Scientists believe that these two theories are the reason why people pursue happiness:
Happiness is an emotional state characterized by feelings of joy, satisfaction. contentment and fulfillment.
While happiness has many different definitions, it is often described as involving positive emotions and life satisfaction.