Do Daydreams Bum You Out?

VIDEO: Living in the Present Can Make You Happier

Whether in line at the supermarket or sitting in traffic on the highway, the human mind is prone to wander at the slightest sign of boredom.

But daydreaming may not be as harmless as it seems: according to a study published Thursday in the journal Science, a wandering mind is often an unhappy one.

Using an iPhone application that prompts users to answer survey questions about their mental state throughout the day, researchers at Harvard University tracked how frequently the minds of 2,250 U.S. adults wandered and how their moods changed accordingly.

Happiness May Be Contagious

While past research on happiness often relies on retrospective reporting -- people trying to remember their mood at past moments -- the real-time responses made possible by this kind of smartphone technology may be the next big thing for tracking behaviors, mood, and mental state, researchers say. This study may serve as proof of concept for using iPhones as a cheap and effective means of collecting data in the future.

Based on self-reported mind wandering and self-gauged levels of happiness collected via subjects' phones, researchers found that people reported being significantly less happy when their minds wandered than when they were focused on the task at hand.

"The human capacity that underlies our ability to mind wander is incredibly important," says Matthew Killingsworth, the lead researcher and a doctoral candidate in psychology at Harvard University. "It allows us to plan for the future, process the past, imagine things that could never occur, but at the same time, the data shows that when people use this capacity it reduces their happiness."

Daydreaming was a surprisingly frequent practice -- subjects reported meandering thoughts nearly half of the time they were questioned -- but this state was consistently associated with a lower mood, even when subjects were thinking about pleasant things, researchers found.

Daydream Underachiever?

Until recently, daydreaming or mind wandering was often thought of as an idle practice that distracted the dreamer from the task at hand. Recent research in psychology and neuroscience is beginning to reveal not only how common daydreaming is, but what an essential and beneficial purpose it serves in our mental functioning.

"You're brain is actually incredibly active when you are daydreaming. It's an intense mental state," says Jonah Lehrer, author of "How We Decide" and "Proust was a Neuroscientist." "It's also our default. We instantly slip into this when we are the least bit bored, and we are just beginning to understand why this is."

Past research has shown that those who daydream more score higher on creativity tests, Lehrer says, and there is reason to believe that mind wandering serves an important social function because it allows us to reprocess how we behaved, how our actions affected others and how we want to proceed in the future.

But while daydreaming brings with it cognitive benefits, this study suggests it also might come with an emotional cost.

For now, researchers can only speculate why mind wandering might be a bummer, but it may have to do with the fact that a wandering mind is often a worrying one, one that is not living in the moment, Killingworth says.

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