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A research team led by Takumi Kagawa and Masashi Kato at the Nagoya University School of Medicine Graduate School has discovered that a unique sound stimulation technique-a device that stimulates the inner ear with sound of specific wavelengths-can alleviate motion sickness (car sickness, seasickness, etc.). Just one minute of stimulation can reduce the swaying and discomfort experienced when reading in a moving vehicle.
The findings, published in the journal *Environmental Health and Preventive Medicine*, offer a simple and effective approach to treating this common condition.
Kagawa stated, "Our research shows that short-term stimulation using a unique sound wave called 'sound spice' can alleviate motion sickness symptoms such as nausea and dizziness. The effective sound level is within the range of daily environmental noise exposure, indicating that this sound technology is both effective and safe."
This finding is an important extension of recent research on sound and its effects on the inner ear. Growing evidence suggests that stimulating balance-related areas of the inner ear with specific sound waves may improve balance. Using mouse models and human experiments, researchers determined 100 Hz to be the optimal stimulation frequency.
Kato explained, "The vibrations of specific sound waves stimulate the otolith organs in the inner ear, which can sense linear acceleration and gravity. This shows that sound wave stimulation can broadly activate the vestibular system, which is responsible for maintaining balance and spatial orientation."
To test the effectiveness of this device, they recruited volunteers who, after receiving sound wave stimulation, were then subjected to motion sickness symptoms induced by swings, driving simulators, or car rides. Researchers evaluated the stimulation's effectiveness using postural control, electrocardiogram readings, and the results of motion sickness assessment questionnaires.
Receiving sound stimulation before driving simulations enhances the activity of the sympathetic nervous system. Researchers found that common motion sickness symptoms such as dizziness and nausea were alleviated.
Kato said, "These results show that sound stimulation can objectively improve the sympathetic nerve dysfunction that often occurs in patients with motion sickness."
Kagawa said, "Short-term exposure to our special sound waves poses minimal health risks. Given that the volume of the stimulus is far below workplace noise safety standards, this stimulus should be safe when used correctly."
Their findings demonstrate that this is a safe and effective method for alleviating motion sickness symptoms, potentially helping millions of people suffering from it. Researchers plan to further develop this technology, aiming for application in various travel scenarios, including air and sea travel.
More information: Yishuo Gu et al, Just 1-min exposure to a pure tone at 100 Hz with daily exposable sound pressure levels may improve motion sickness, Environmental Health and Preventive Medicine (2025). DOI: 10.1265/ehpm.24-00247
Information source: medicalxpress
Note: This article is reprinted from 21dB Acoustics.