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Elderly residents in a geriatric home had increased powers of concentration after a visit to a garden, compared to after relaxing in a favorite room indoors.
Ottoson, Johan and Patrik Grahn. (2005). A Comparison of Leisure Time Spent in a Garden with Leisure Time Spent Indoors: On Measures of Restoration in Residents in Geriatric Care. Landscape Research 30, 1: 23-55.