Super low sounds make people dance. Free Technical Library News

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Super low sounds make people dance

21.11.2022

Rhythmic sounds at frequencies beyond the range of human hearing affect listeners. Experiments with the Canadian band Orphx showed that extremely low basses stimulate the audience to dance, although they are not perceived by consciousness.

"Music is a biological mystery: it's not needed for reproduction, nutrition or survival, but why do people love it so much and love to move to it so much"? asks Daniel Cameron. Together with colleagues from the Canadian McMaster University, he explores the effect of music on our nervous system. In their new work, scientists have found that even ultra-low frequencies lying on the verge of hearing imperceptibly affect listeners, stimulating them to dance and move more actively.

The impact of music on a person is unexpected and varied. Many of its aspects are related to personal experience and familiar culture, but others are universal. It is not for nothing that representatives of any peoples perceive the same melodic phrases all the same - let's say, as sad or invocative, triumphant. There are also mysterious manifestations such as memory improvement while listening to well-known songs.

Especially for music research at McMaster University, a "laboratory" concert hall LIVELab is arranged. It is equipped with motion capture cameras and sophisticated Meyer acoustic equipment capable of reproducing the entire spectrum of frequencies accessible to the human ear (approximately 20 to 20 thousand hertz), as well as beyond this range. To participate in new experiments, Cameron and his colleagues invited the popular duet Orphx, working in the genre of electronic dance music.

Volunteers who came to the concert were given sensors to better track their movements. In addition, they completed questionnaires before and after the 55-minute duet performance. And during it, scientists imperceptibly changed the settings of the acoustic equipment: every 2,5 minutes they turned on and off the speakers that reproduced ultra-low bass frequencies from eight to 37 hertz.

Experts compared the intensity of the movements of the public during these intervals. It turned out that when the ultra-low bass sounded, the audience moved an average of 11,8 percent more actively than when they were not present. At the same time, the questionnaires showed that no one noticed any difference by ear: the frequencies were too low.

The reasons for this are not exactly known. The authors of the study suggest that the effect may be due to the direct influence of ultra-low frequencies on the brain, bypassing conscious perception. The structures of the inner ear are closely integrated into the functioning of the vestibular apparatus and the motor system. Perhaps their vibrations are able to be directly reflected in the work, without involving the ear.

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