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The scientific study of happiness and wellbeing has developed substantially since Martin Seligman articulated positive psychology as a field in his 1998 American Psychological Association presidential address. The field has moved beyond the absence of pathology to the study of what makes life worth living, producing a research literature that challenges many intuitive beliefs about the sources of wellbeing and that has generated practical applications in clinical settings, organizational contexts, and public policy. Hedonic and eudaimonic wellbeing are the two primary dimensions studied in happiness research. Hedonic wellbeing refers to the experience of pleasure and the absence of pain, often operationalized as high positive affect, low negative affect, and high life satisfaction. Eudaimonic wellbeing refers to a sense of meaning, purpose, engagement, and functioning well, distinct from moment-to-moment pleasure. Research suggests these dimensions are related but distinct, and that eudaimonic wellbeing may be more strongly associated with long-term health outcomes and less subject to hedonic adaptation. Hedonic adaptation, the tendency for people to return to their baseline level of wellbeing after positive or negative events, is one of the most robust findings in happiness research. Research by Philip Brickman and others found that lottery winners were not substantially happier than controls after adaptation periods, and that people with spinal cord injuries were more resilient than observers predicted. The adaptation finding does not mean that events do not matter for wellbeing, but that their effects are typically more transient than anticipated. People show what Daniel Gilbert calls affective forecasting errors, systematically overestimating the hedonic impact of both positive and negative events. Social relationships are among the most consistent predictors of wellbeing across cultures, measures, and time periods. Research on the predictors of long-term happiness, including longitudinal studies like the Harvard Study of Adult Development, consistently finds that relationship quality, more than income, status, or achievement, predicts sustained wellbeing and health. The mechanisms include emotional support, social comparison, meaning derived from connection, and the physiological effects of social connection on stress biology. Income and happiness show a more complex relationship than either simple accounts suggest. Research by Kahneman and Deaton documented that emotional wellbeing increases with income up to approximately 75,000 dollars annually but does not continue to increase substantially beyond that threshold. Subsequent work by Matthew Killingsworth using experience sampling methods suggested a continuing relationship between income and wellbeing at higher levels. The emerging view is that the relationship is continuous but the marginal returns to income decrease as income increases, and that the way income is spent matters as much as its amount. Experiential versus material purchases show different wellbeing patterns in research. Research by Thomas Gilovich and others finds that spending money on experiences, travel, concerts, shared activities, tends to produce more sustained wellbeing than spending on material possessions, in part because experiences are more resistant to social comparison, more central to identity, and more capable of being savored and recalled. The tendency to compare material goods to those of others, which diminishes their hedonic value, applies less strongly to experiential goods. Flow, the state of complete absorption in a challenging activity that matches one's skill level, described by Mihaly Csikszentmihalyi, is associated with high wellbeing, meaning, and engagement. Research using experience sampling methods finds that flow experiences are associated with elevated positive affect and engagement in the moment, though sometimes with lower subjective happiness than easier, more relaxing activities. Flow appears to be particularly associated with eudaimonic rather than hedonic wellbeing. Gratitude practices have accumulated experimental evidence for producing increases in wellbeing. Research on gratitude journals, gratitude letters, and gratitude exercises consistently shows benefits for wellbeing, though effect sizes vary and the longevity of effects depends on continued practice. The mechanisms proposed include attention shifts toward positive aspects of life, increased social connection when gratitude is expressed to others, and changes in how positive events are savored and remembered. The PERMA model, proposed by Seligman as a framework for wellbeing, identifies five elements: positive emotions, engagement, relationships, meaning, and accomplishment. The model provides a multi-dimensional framework that incorporates both hedonic and eudaimonic elements and has been applied in positive psychology coaching, wellbeing programs, and positive education initiatives. Research on PERMA-based interventions shows benefits for multiple wellbeing dimensions, though the model's comprehensiveness is also a limitation for evaluation purposes.

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''Originally published January 15, 2020 on [https://docmoates.com/blog/the-science-of-happiness-what-research-shows-about-wellbeing/ docmoates.com].''