For hundreds of years, natural sounds and green environs have been associated with relaxation and well-being. This study is notable for being one of the first to employ brain scans, heart-rate monitors, and behavioral trials to establish a physiological explanation for these effects.
The researchers recruited 17 healthy people to obtain functional magnetic resonance imaging (fMRI) scans while listening to a variety of five-minute soundscapes of natural and artificial environments to study the relationship between the brain, the body, and background noise.
During each soundscape, participants also completed a task to assess their attention and response speed. Their pulse rates were also monitored to detect changes in their autonomic nerve systems—the organs involved in involuntary functions like breathing.
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