In a promising breakthrough for travellers who suffer from motion sickness, a team of Japanese researchers has identified a safe and simple way to reduce symptoms such as nausea and dizziness—by stimulating the inner ear with a specific sound frequency.

The research group, led by Takumi Kagawa and Masashi Kato from the Nagoya University Graduate School of Medicine, found that a brief exposure to a uniquely calibrated sound, dubbed ‘sound spice®’, can significantly alleviate the effects of motion sickness.

"Our study demonstrated that short-term stimulation using a unique sound called sound spice® alleviates symptoms of motion sickness, such as nausea and dizziness," the media reported quoting Kagawa.

"The effective sound level falls within the range of everyday environmental noise exposure, suggesting that the sound technology is both effective and safe," the report added.

Motion sickness affects millions of people worldwide, making even the shortest of journeys by car, boat, or plane an uncomfortable experience.

This new research adds to the growing body of evidence suggesting that auditory stimulation could offer a viable solution.

The researchers discovered that sound waves at a frequency of 100 Hz stimulate the inner ear’s otolithic organs, which are responsible for detecting gravity and linear acceleration.

These organs play a crucial role in the body’s balance and spatial orientation systems.

"This suggests that a unique sound stimulation can broadly activate the vestibular system," explained Kato, referring to the complex inner ear network that helps maintain balance.

"Vibrations at the unique sound stimulate the otolithic organs in the inner ear, which detect linear acceleration and gravity," Kat added.

To test the effectiveness of the technique, volunteers were exposed to the unique sound before being subjected to motion sickness-inducing conditions, including a swing, a driving simulator, and car rides.

Researchers measured their responses using postural control tests, ECG readings, and the Motion Sickness Assessment Questionnaire.

Participants reported significantly reduced symptoms, such as lightheadedness and nausea, following the auditory stimulation.

"These results suggest that activation of sympathetic nerves, which are often dysregulated in motion sickness, was objectively improved by the unique sound exposure," further informed Kato.

Crucially, the researchers found no health risks associated with the short-term exposure to the sound.

"Given that the stimulus level is well below workplace noise safety standards, this stimulation is expected to be safe when used properly," added Kagawa.

The discovery opens new doors for developing practical solutions for motion sickness, particularly in scenarios such as car journeys, flights, or sea travel.

The team is now working on further refining the technology with a view towards commercial application.

With continued development, sound spice® could offer a non-invasive, drug-free alternative for millions who struggle with motion sickness—making travel a far more comfortable experience.

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