When we talk about success, talent, hard work, or even luck usually come to mind. Yet, for decades, scientists believed another factor was equally important – willpower. The ability to delay instant gratification for the sake of long-term benefits has been seen as a critical predictor of life achievements. This psychological phenomenon became widely known through the famous marshmallow test by Walter Mischel.
The Marshmallow Experiment: How It All Began
In the 1970s, psychologist Walter Mischel at Stanford University designed a simple yet groundbreaking experiment with preschool children. Each child was given a choice: eat one marshmallow immediately or wait about 15 minutes and receive two marshmallows instead.
Although it seemed like a simple children’s game, the results became a cornerstone in the study of human behavior. Most children ate the marshmallow right away, while about one-third showed enough patience to wait for the bigger reward.
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Long-Term Findings and the Cult of Willpower
Two decades later, researchers revisited the participants and discovered fascinating correlations. Those who managed to wait as children often grew into more successful adults – excelling in education, careers, and social life.
This gave rise to the belief that willpower was the ultimate predictor of success. The marshmallow test was cited in countless studies, books, and self-help guides, reinforcing the idea that discipline and delayed gratification were essential to achieving life goals.
Criticism and Re-Evaluation
However, in 2018, researcher Tyler Watts and his colleagues revisited the experiment, adding new variables to the analysis. They found that the decisive factor wasn’t necessarily willpower, but rather the child’s socioeconomic background.
Children from wealthy families could afford to wait, because “later” was a reliable concept in their lives. Promises were often kept, and resources were stable. For children from disadvantaged families, “later” often meant “never.” In such environments, taking the reward immediately was the rational choice.
In other words, willpower was not an absolute inner trait, but rather a reflection of the child’s environment and upbringing.
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Cultural Differences: Insights from Japan and the U.S.
The picture became even more complex after a 2022 study conducted in Kyoto, Japan. Researchers compared Japanese and American children, and the results were surprising.
Japanese children were able to wait up to 15 minutes for food but could barely last five minutes when the reward was a toy or gift. American children behaved in the opposite way: they patiently waited for gifts but quickly ate the marshmallow, often within just four minutes.
This showed that self-control is not universal but deeply tied to cultural values. In Japan, food carries symbolic meaning, traditions, and respect, while in the U.S., material rewards such as gifts often hold higher value.
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The marshmallow test and its reinterpretations reveal that willpower is not simply innate – it is shaped by family, culture, and life circumstances.
In some environments, the ability to wait is crucial.
In others, immediate action may be more adaptive.
Most importantly, trust, habits, and cultural upbringing are just as essential as personal discipline.
The ultimate conclusion is that success cannot be explained by willpower alone. Instead, it emerges from a combination of personal traits, family environment, social stability, and cultural traditions.
