Its perfectly true that someones happiness over a single day will be affected by what happens to them over that period, Steptoe says. However, survey experts and psychologists have come to the view that in many ways, this is a better approach to understanding how people actually feel than asking them general questions about how happy they are. Responses to general questions are influenced strongly by personality, by what people think they ought to say and by recollections that might not be quite accurate, Steptoe says.
Whats not clear, he says, is whether happy feelings are the key to longevity or if its something else that causes extended life. We cant draw the kind of final conclusion that the happiness is leading directly to better survival, he says.
longevity n. 长寿;寿命
draw a conclusion 下结论
Others who have done research in this area but havent read the study say this link between a one-day measure and mortality is important.
The fact that positive emotions in one day predicted survival is pretty amazing, says Sonja Lyubomirsky, a psychology professor at the University of California, Riverside.
We do know that happiness is associated with an extended life span, she says. If we can get people to be happier, would that extend the lifespan? We dont know that yet. Future research can definitely try to show that.
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