In public places that are not well-lit or crowded, bird songs and human vocal sounds make people feel a social presence and gives them an increased sense of safety, scientists have found.
"There is a feeling of unease when people are alone in public places, such as a parking garage, metro station or airport tunnel," said Indian-origin scientist Aradhna Krishna, the director of the Sensory Marketing Laboratory at University of Michigan's Ross School of Business.
Advertisement"This doesn't just give people bad feelings. It can have negative business effects when people actively avoid such areas. We know some retailers have used ambient sounds to affect customers' moods and time perceptions. We wondered if the correct ambient sound could also make people feel secure," Krishna said.
A field study was conducted by Krishna and colleagues in a parking garage on the Champs-Elysees in Paris and four lab experiments to examine the effects of different types of ambient noise, and no noise, on people's feelings and behaviour at an underground parking lot and a simulated metro station.
Classical instrumental music, bird songs were played by the researchers and no sound was played for sometime at the underground parking lot. People who heard the bird songs felt a higher sense of perceived safety than those who heard the instrumental music, or no sounds.
In another experiment, human vocal songs were added to the mix and it showed that people reacted positively to both the bird songs and human vocal songs. Both bird sounds and human vocal sounds made people feel a social presence, which then gave them an increased sense of safety.
The effect of sounds were tested on consumer behavior. A video of a metro station with the various sounds - human voices, bird songs, instrumental and no sound were shown to study participants.
A series of questions about the station and their perceptions, and whether they would be likely to stop and buy a monthly pass at that station were asked. Those people who were shown the video played with human vocals and bird songs rated the station as safer and were more likely to say they would buy a monthly pass there than people who heard instrumental music or no song.
"We provide some real-world evidence that appropriately chosen ambient sounds introduced in public spaces perceived to be dangerous can increase human comfort and feelings of safety," said Krishna.
"Bird songs and human vocal sounds give a sense of social presence and seem to be the most effective to use. They even lead to more positive consumer responses and overall higher satisfaction with these places," she said. The study will be published in the International Journal of Research in Marketing.
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