There is a particular kind of disappointment in realising that something you worked hard to achieve feels ordinary much sooner than you expected. A raise, a new home, a long-awaited purchase, a relationship milestone. The lift is real. Then, sometimes within weeks, sometimes months, life resumes its usual texture. The thing you wanted is now simply part of the background.
This is not ingratitude. It is not a character flaw. It is a well-documented feature of how human psychology works, and understanding it changes what wellbeing investment actually looks like in practice.
The Research Behind the Pattern
In 1978, psychologists Philip Brickman and Donald Campbell published a paper introducing the concept they called the “hedonic treadmill.” Their central argument was that people tend to return to a relatively stable baseline level of happiness following positive or negative life events, rather than sustaining the emotional lift or the emotional blow indefinitely.
Brickman followed that theoretical framework with a study that has become one of the most cited in happiness research. He and his colleagues compared the self-reported happiness of lottery winners with that of a control group and found that, after the initial period of elation, lottery winners were not substantially happier than people who had not won. They had adapted. The windfall became the new normal.
The study was small and has been critiqued methodologically in the decades since, but the core finding has been supported by much larger and more rigorous research. Sonja Lyubomirsky, a professor of psychology at the University of California Riverside, has spent much of her career examining hedonic adaptation and what, if anything, can slow it down. Her research suggests that adaptation is not uniform. Its pace depends heavily on what kind of positive change is involved and how we engage with it.
Key Insight: In a 2011 paper, Lyubomirsky and her colleague Julia Boehm reviewed evidence across multiple studies and found that hedonic adaptation to positive circumstances is faster when the circumstances become predictable and familiar. Variety, savoring, and effortful attention all appear to slow the process. The implication is that the problem is not happiness itself, but the conditions under which it is pursued.
Lyubomirsky has also offered a widely cited estimate, drawing on twin studies and longitudinal research, that circumstances contribute far less to sustained wellbeing than most people expect. The numbers have been debated and refined, but the broader finding has held up across multiple lines of research.
Why We Mispredict This
Part of what makes hedonic adaptation worth understanding is that we are not very good at anticipating it. Psychologist Daniel Gilbert at Harvard has studied what he calls “affective forecasting,” our attempts to predict how future events will make us feel. His research shows that people consistently overestimate both the intensity and the duration of emotional responses to positive events. We expect the good thing to keep feeling good longer than it does.
This is called the “impact bias.” It leads people to make decisions based on how they imagine future states will feel, rather than on how those states typically feel once reached and adapted to. We work toward a goal believing it will transform how we feel. When it does not, the confusion can be disorienting, and sometimes people conclude they simply chose the wrong goal, when what actually happened was ordinary adaptation.
None of this is an argument against wanting things or working toward goals. The research is not saying that achievement is meaningless or that positive life events do not matter. They do. The point is that they matter differently than we tend to expect, and adapting our approach to wellbeing accordingly produces better results than continuing to chase the next acquisition.
Remember: The fact that you adapted to something good is not evidence that it was not worth having. It is evidence that your baseline shifted, which is also how we adapt to difficulty. The same mechanism that diminishes a lottery win also enables recovery from loss.
What the Research Suggests Actually Works
If material acquisitions and changed circumstances produce relatively short-lived happiness boosts, what tends to produce more lasting wellbeing? This is where Lyubomirsky’s research becomes practically useful.
Experiences adapt more slowly than possessions. Research from Thomas Gilovich and colleagues at Cornell suggests that spending on experiences produces more sustained positive emotion than spending on objects, in part because experiences are harder to compare and less easily taken for granted. A possession becomes habituated to quickly because it is simply present, static and repeatable.
Variety counteracts adaptation. Lyubomirsky’s research suggests that introducing variation into positive activities slows the process. A pleasant walk becomes less pleasant if it is the same walk at the same time every day. Change the route, the company, or the time of day, and the positive effect persists longer.
Savoring, the deliberate practice of attending to and appreciating positive experiences as they occur, or shortly after, has been shown across multiple studies to extend their emotional benefit. This is different from toxic positivity or forcing gratitude. It is a cognitive practice of bringing attention to what is actually good in the present moment rather than moving immediately toward the next thing.
Relationships and social connection appear to be more resistant to adaptation than solitary pleasures. Positive social experiences are more variable than solitary ones, richer in unpredictability, and more tightly connected to the basic psychological needs that researchers have linked to wellbeing: belonging, feeling known, and mattering to others.
How This Connects to Broader Wellbeing
Understanding hedonic adaptation is one part of a larger picture. The question is not just “how do I feel better” but “how do I invest in wellbeing in ways that are likely to last.” That requires some understanding of how psychological states are generated and maintained over time.
The PERMA model is useful here because it identifies the building blocks of wellbeing that tend to be robust against adaptation: positive emotion, engagement, relationships, meaning, and accomplishment. Of these, the elements least vulnerable to the hedonic treadmill are arguably the ones with the most depth, meaning and relationships in particular, because they are not static conditions but ongoing processes.
Hedonic adaptation also has an underappreciated relationship with languishing, the state of low-grade flatness and disconnection that is easy to overlook because it is not acute distress. If the things that used to feel meaningful have faded without being replaced, that flatness often reflects adaptation more than anything else. The post on what languishing actually is explores that terrain in more detail.
The practical takeaway from the research on hedonic adaptation is not pessimistic. It is redirective. The tendency to return to baseline is not a bug to be fixed. It is a feature of a flexible psychological system. The same mechanism protects us from being permanently devastated by loss. What changes, when we understand it, is where we aim our efforts. Less accumulation, more engagement. Less arriving, more attending to where we already are.
If this framing resonates, the Upward Spiral program is designed with exactly this kind of evidence-based understanding at its foundation.
Related Reading
Upward Spiral is a 52-week program grounded in positive psychology and neuroscience, designed for people who are functioning but not flourishing. Each week builds on the last. Learn more and start your free trial.
Back to all posts