SEOUL, February 26 (AJP) - A research team at Kookmin University has developed a new method to deliver cognitive health benefits through everyday sounds by blending therapeutic frequencies with natural environmental recordings. The study focuses on making 40Hz auditory stimulation, which is known to help prevent Alzheimer's disease, more comfortable for long-term listening by integrating it into local South Korean soundscapes.
Professor Namkung Ki-chan and his team at the Kookmin University Techno Design Research Institute published two papers on this cognitive wellness research in the international journals Healthcare and Applied Sciences. Both publications are ranked within the top 40 percent of their respective fields, covering health systems and applied sciences.
While 40Hz gamma-band sound stimulation has gained attention for its potential to improve brain health, listening to the raw, repetitive tones often causes ear fatigue and discomfort. To solve this, the researchers recorded natural sounds from locations such as Chuncheon and Uljin in South Korea. They then built a protocol to naturally embed the 40Hz frequency into these environmental soundscapes, ensuring the therapeutic effect remains while the listener hears only the calming sounds of nature.
The research combined user experience design with brainwave measurements to ensure the system is practical for daily life. By testing various mixing levels and playback structures, the team identified the best way to keep the 40Hz signal effective without it becoming a distraction.
The two studies examined how participants accepted these sounds and used electroencephalogram (EEG) tests to confirm that the brain still recognized the 40Hz stimulation even when hidden within a natural soundscape. The results showed that the redesigned sounds were significantly easier to listen to over long periods while successfully triggering the intended brainwave responses.
The project originated from a Soundscape Design course at the Kookmin University Graduate School of Techno Design. Graduate students from the Interaction Design Lab participated as co-authors, handling everything from field recording and sound production to conducting the experiments and drafting the research papers.
Professor Namkung Ki-chan stated that the core of the research was taking a frequency that is effective for cognitive health but usually unpleasant to hear and turning it into a sustainable auditory experience using local South Korean soundscapes. He noted that the project is a meaningful example of an academic course leading directly to international research achievements.
(Paper information)
Journal: Healthcare (JCR Q2)
Title: User Experience Design and Implementation of 40Hz Auditory Stimulation for Cognitive Wellness
DOI: https://doi.org/10.3390/healthcare13010045
Journal: Applied Sciences (JCR Q2)
Title: EEG-based Verification of Soundscape-mediated 40Hz Gamma-band Stimulation
DOI: https://doi.org/10.3390/app15010123
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