The Stranger in the Woods: The Extraordinary Story of the Last True Hermit

by Michael Finkel

The body responds immediately, even during sleep. People who live in cities experience chronically elevated levels of stress hormones. These hormones, especially cortisol, increase one’s blood pressure, contributing to heart disease and cellular damage. Noise harms your body and boils your brain. The word “noise” is derived from the Latin word nausea. You don’t need that much quiet to change things, or even have to be alone. But you do have to seek out a soothing environment, and you must do it often. Japanese researchers at Chiba University found that a daily fifteen-minute walk in the woods caused significant decreases in cortisol, along with a modest drop in blood pressure and heart rate. Physiologists believe our bodies relax in hushed natural surroundings because we evolved there; our senses matured in grasslands and woods, and remain calibrated to them. A Duke regenerative biologist, Imke Kirste, working with mice, found that two hours of complete silence per day prompted cell development in the hippocampus, the brain region related to the formation of memory. Studies of humans in the United States, Great Britain, Holland, and Canada have shown that after passing time in quiet, rural settings, subjects were calmer and more perceptive, less depressed and anxious, with improved cognition and a stronger memory. Time amid the silence of nature, in other words, makes you smarter.