Scientists have known for some time that the human brain’s ability to stay calm and focused is limited and can be ＿＿（26）＿＿ by the noise and hectic demands of city living, sometimes ＿＿（27）＿＿ a condition informally known as brain fatigue. With brain fatigue, you are easily distracted, forgetful and mentally ＿＿（28）＿＿. But a new study from Scotland suggests you can ease brain fatigue by simply ＿＿（29）＿＿ through a park. Researchers have long theorized ＿＿（30）＿＿ green spaces are calming, requiring less of our directed mental attention than urban streets ＿＿（31）＿＿. Natural settings invoke “soft fascination,” a term for quiet contemplation, ＿＿（32）＿＿ the brain can reset overstretched resources of attention and reduce mental fatigue. But this theory has been difficult ＿＿（33）＿＿ to the test. Previous studies have found that people who live near trees and parks have lower levels of cortisol, a stress hormone, in their saliva than those who live primarily ＿＿（34）＿＿ concrete, and that children with attention deficits tend to concentrate and perform better on cognitive tests after walking through parks. Scientists have studied volunteers and found that brain wave ＿＿（35）＿＿ show that the volunteers are calmer when they view natural scenes.