Other studies have shown similar results. In one experiment, bedridden heart-surgery patients were given color pictures to look at after their operations. Patients looking at an open, well-lit and natural image of trees and water needed fewer painkillers than patients who had no picture or an abstract image.
Another study found that healthy volunteers sitting in a hospital had a higher pain threshold and better pain tolerance when they were watching a video of nature scenery than when they were watching a blank static screen.
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