| Abstract |
| High-frequency is sound produced in non-audible area, which couldn`t be heard in daily life. The frequency range above 22Khz is called ``high-frequency`` and its components are called ``HFC (High-Frequency Components)``. It is known that ocean wave sound is rich in HFC, because it brings serenity and causes α-waves in human mind. When this natural sound is combined with high-frequency, it seems to give a pleasurable feeling, indicated by an α -wave increase and a β-wave decrease. We call this phenomena "the hypersonic effects". In this experiment, subjects listened to the ocean wave sound simultaneously with corresponding frequencies similar to ocean wave frequency components created artificially in a electric circuit. Brain waves were measured by an EEG system with 8 channels using 8 electrodes on Fp1, Fp2, F3, F4, T3, T4, O1, and O2. The results showed that α-wave increase and β-wave decrease were statistically significant while subjects were listening to the ocean wave sound along with the high frequency components, reflecting the hypersonic effect. |
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| Key Words |
| 초음파, 초음파성분, 극초음파 효과, 파도소리, 뇌파, 알파파, 베타파, hypersonic effect, ultrasound, wave sound. EEG, alpha wave, beta wave |
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