Birdsong and Green Views Slash Stress, Boost Mood, New Study Shows

Natural environments linked to measurable mental‑health gains, new research finds

Researchers at North Carolina State University conducted an experiment to isolate how auditory and visual cues from natural settings influence emotional states compared with typical city soundscapes.

Participants were fitted with noise‑isolating headphones and placed either on a restored trail away from development or in a bustling downtown area. While seated, they listened to recordings of either traffic noise or bird vocalizations, with both the location and the audio track assigned randomly to each individual.

After each session, volunteers rated their stress levels and how revitalized they felt—a measure known as restorativeness. According to lead author Nils Peterson, a professor in the College of Natural Resources, the outcomes demonstrated a clear advantage for the nature‑based condition.

“When individuals were surrounded by greenery and exposed to birdsong, they reported heightened positive affect, reduced negative affect, lower stress, and a stronger sense of renewal than any other scenario,” Peterson explained.

Conversely, participants situated in an urban setting while hearing traffic sounds experienced the opposite trend, while mixed pairings (e.g., birdsong in the city or traffic in the park) produced intermediate responses.

The findings suggest that incorporating natural auditory elements into otherwise stark urban spaces could mitigate some of the psychological drawbacks of such environments. “If a concrete‑heavy area is prone to elevate stress, introducing natural sounds can soften its impact,” Peterson noted.

Although the study focused on bird calls, the authors point to a broader body of literature that supports the mental‑health benefits of other natural sound sources, such as flowing water.