From the archive · July 25, 2026
Happiness resets
Why does the thing you were sure would make you happy stop working?
01 · Word
Hedonic treadmill
Pronounced hih-DAH-nik TRED-mil
noun
The tendency of people to return to a roughly stable baseline level of happiness despite major positive or negative life changes
Examples
The raise felt enormous for a month, then normal: the hedonic treadmill, right on time.
Knowing about the hedonic treadmill, he stopped assuming the next purchase would finally make him content.
Origin
Coined as “hedonic adaptation” by psychologists Philip Brickman and Donald Campbell in 1971, who used the treadmill image: to keep happiness rising, conditions would have to keep improving just to stay in the same subjective place. “Hedonic” is from the Greek hēdonē, “pleasure.”
02 · Idea
Adaptation pulls you home
The mind grades on a curve set by what it is used to. A raise, a new house, or a win becomes the new normal, and its glow fades; a loss or injury, over time, is partly absorbed the same way. Because the baseline resets, chasing lasting happiness by improving your circumstances is like speeding up a treadmill: more effort, same position. What tends to move the baseline is relationships, meaning, and engagement rather than acquisitions.
The idea grew out of adaptation-level theory and was dramatized by a famous 1978 study by Philip Brickman, Dan Coates, and Ronnie Janoff-Bulman, which compared major lottery winners, people paralyzed in accidents, and a control group. Winners rated everyday pleasures lower and were not dramatically happier overall; the contrast highlighted how strongly people adapt.
Speed up the treadmill all you like (improve the circumstances) and you can still end up standing in the same place.
If the baseline resets, the durable gains come from what you do, not what you get.
Limits and context
The treadmill is real but not total. Later large studies found that set points can shift lastingly after events like disability, divorce, or long-term unemployment, and that people differ in how fully they adapt. Adaptation is a strong pull, not an iron law. The original 1978 study used small samples that would need careful replication.
The practical takeaway is not despair but reallocation: spend less on the purchases you will adapt to and more on the experiences, relationships, and pursuits that resist adaptation.
03 · Moment
Winners, victims, and a control group
Illinois, mid-1970s; interviews with recent lottery winners and people recently paralyzed in accidents
In a 1978 study, psychologists Philip Brickman, Dan Coates, and Ronnie Janoff-Bulman interviewed three groups in Illinois: people who had recently won large lottery prizes, people who had recently been paralyzed in accidents, and a control group drawn from the same area. They measured general happiness and, tellingly, how much pleasure each group took from ordinary activities like eating breakfast or chatting with a friend.
- Published
- 1978
- Groups
- Winners, victims, controls
- Finding
- Both adapted
The caveat
The samples were small, a few dozen people per group, and they came from one time and place, so the exact figures should be read as a striking illustration rather than a precise measurement. The broad pattern of adaptation has held up better than the specific numbers.
The winners were not dramatically happier than controls and reported taking less pleasure in everyday activities, while the accident victims, though less happy, were not as devastated as observers assumed. The study became one of psychology's most-cited illustrations of hedonic adaptation and helped launch modern happiness research, including later, larger work that both confirmed adaptation and mapped its limits.
The paper's memorable title asked whether lottery winners and accident victims end up on the same footing. That is the question the “treadmill” metaphor answers.
The connection
People adapt to their circumstances, good and bad, drifting back toward a personal baseline, so chasing happiness through changing conditions is running to stay in place.