Subjects were split into two groups. One group was asked to take a walk on a wooded path in an arboretum near the Ann Arbor, Michigan, campus where the study was conducted. The other group was sent on a walk through the bustling center of the city. Both groups were then given a concentration-sapping task called backward digit-span. The core finding of the study is that the nature group performed up to 20 percent better on the task. The nature advantage still held the next week when the researchers brought back the same subjects and switched the locations: It wasn’t the people who determined
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