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阅读下面短文，根据题目要求用英文回答问题。请在答题卡指定区域作答。
If you are a psychology enthusiast, you have probably heard of the famous marshmallow test （棉花糖实验）. In this task, kids are given a marshmallow, and are told that they can eat that marshmallow now, or wait a little while, and have two marshmallows instead. Some kids eat the marshmallow immediately, but most try their best to wait for two.
When the researchers followed up with those kids later in life, children who waited longer had better life outcomes: more academic success, better social behavior, and even markers of better health. They believe those children who keep waiting are the ones with the most self-control-a key factor in success, and that's why they are so successful later.
But what if the behavior in the marshmallow test has more to do with cultural norms than self-control?
A 2022 study tested the idea that children may decide how long to wait for rewards based on what they are accustomed to waiting for in their culture. For example, in the United States, there is no widespread mealtime custom of waiting until everyone is served. In Japan, however, there is.
Because of this difference in norms, the researchers hypothesized that Japanese children would wait longer in the marshmallow test than the American children. This is exactly what they found later in experiments.
But this isn't conclusive evidence; after all, maybe Japanese children actually have better self-control, or maybe they differ from American children in other ways that could explain the result.
In the U. S. , gifts are usually given on special occasions and children usually have to wait before they can unwrap their presents. In Japan, however, gift-giving happens more often, and children usually open presents immediately.
Given these cultural differences, scientists expected that if they ran the test with gifts instead of marshmallows, American kids would wait longer. Once again, their hypothesis was correct.
This is a powerful result because it demonstrates the importance of culture and habit in shaping behavior. If a child waits only few minutes before giving up on two marshmallows but much longer to unwrap a gift, can we really say that child lacks self-control? I don't think so. I think it just means that they are adjusting well to their social settings.