비가청 주파수 대역의 산림음이 뇌파에 미치는 영향에 관한 연구
A Study on the Effect of Forest Sounds in the Inaudible Frequency Band on Brain Wave
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본 연구는 산림 속에서의 비가청 대역의 고주파 성분(이하 산림음 또는 HFC)이 스트레스 경감에 미치는 영향을 연구하였다. 산림 속에는 특이한 고음이 존재하고 있었으며 주파수대역도 광범위하였다. 오후보다는 오전, 오전보다는 새벽이 더욱 채집 레벨이 높았으며 관목보다는 교목이 많은 산림이 더욱 높았다. 산림음을 채집하여 음원으로 정제하였으며 이를 이용하여 청각과 촉각으로 연구대상자에게 노출시켰을 때 알파파의 증가를 확인할 수 있었다. 알파파는 심신안정과 주의에 관여하는 뇌파로써 산림치유에서는 스트레스 경감 등의 확인 지표로 사용되기도 한다. 또한 알파파는 SMR파와 수면 방추와 깊게 연관이 있으므로 알파파의 향상을 위한 자극방법과 그 효과의 발견은 매우 뜻 깊은 결과라 하겠다. 이러한 결과는 자연휴양림 신규 기획 시 대상지 선정 조건에 필수 조건으로 고려할 수 있다. 또한 향상된 산림치유 효과를 위하여 HFC 노출 빈도와 정도를 고려하는 등 새로운 산림치유 기법을 발견했다고 생각된다. 산림음을 하나의 음원으로 정제하여 청각으로 자극했을 때 p-value는 0.002였으며 이를 촉각으로 치환하여 전중혈을 자극했을 때 p-value는 0.0001을 얻을 수 있었다. 본 연구의 성공적인 결과로 산림치유의 효율향상 및 사무 공간 등 실내에서의 진행 가능성을 기대할 수 있겠다. 고주파 성분의 산림음을 적용하는 새로운 산림치유 기법은 악천후 또는 도심 등 산림치유 적용성을 확장 가능하다는 측면에서 많은 응용이 가능할 것으로 보인다.
Abstract
This study investigated the effect of high-frequency components of the inaudible band (hereinafter referred to as forest sounds or HFC) in forests on stress reduction. There were unique high-frequency sounds in the forests, and the frequency range was wide. The collection level was higher in the morning than in the afternoon, and in the early morning than in the morning, and forests with more trees were better than shrubs. Forest sounds were refined as sound sources through collection and editing, and when exposed to subjects through hearing and touch, an increase in alpha waves was confirmed. Alpha waves are brain waves involved in mental and physical stability and attention, and are also used as indicators of stress reduction in forest healing. In addition, alpha waves are deeply related to SMR waves and sleep spindles, so the discovery of stimulation methods for improving alpha waves and their effects is a very meaningful result. These results should be considered as essential conditions for selecting a target site when planning a new natural recreation forest. In addition, it is thought that a new forest healing technique has been discovered, such as considering the frequency and degree of forest sound exposure for improved forest healing effects. When the forest sound was refined into a single sound source and stimulated auditorily, the p-value was 0.002, and when it was replaced with a tactile sensation and stimulated the middle part of the chest, the p-value was 0.0001. The successful results of this study can be expected to improve the efficiency of forest healing and to enable its use indoors, such as in office spaces. The new forest healing technique that applies high-frequency forest sounds is expected to have many applications in terms of expanding the applicability of forest healing to bad weather or urban areas.
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