 Sound and body >> Relationship with body >> Ear mechanism >> 
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人体との関係 -Relationship with body-
〈1〉Music therapy： A treatment method that applies recovery, improvement of physical and mental health by applying physiological, psychological and social effects when listening to music and playing. 〈2〉Memory recovery： Utilize music to put out the information people have stored in their heads. ( Very effective for stimulating nerves ) 〈3〉Immune power rise： Reduce stress and lower the value of stress hormone cortisol. When you feel better by listening to music, physiological changes will occur, leading to reduced stress and increased immunity. 〈4〉Headache recovery： Changing the usual sound activating induced brain waves, which is one of the causes of headache, to spontaneous electroencephalogram and relieving the irritation to relieve headache.
・It is because we are in our stomach that we have "hearing" which is a human five senses (visual - olfactory - taste - tactile - auditory). As I look closely, 〈1〉A prototype of the ear can be made around 6th week of pregnancy 〈2〉We feel a sound at the fifth month of pregnancy 〈3〉At the 8th month of pregnancy, we are also distinguishing between high and low of sound and large and small Although it is a feeling, baby is not yet equipped with auditory characteristics like an adult . ・Also, since it is surrounded by amniotic fluid at the time of fetus, ( sensation as if we are in the pool ) The sound pressure is considerably lower than the outside world, and the frequency characteristics are also changing. 【2】Sounds that can be heard by adults ・The audible frequency that a person can hear will change somewhat depending on conditions such as age, sex and ear structure, but it is said to be around 20 to 20000 Hz. Ultra low frequency sound that is lower than 20 Hz and can not be heard by people. The sound higher than 20000 Hz is called ultrasonic wave. ・In adults, the ear sensitivity is highest at around 4000 Hz, and even small sounds can be heard. Therefore, the sound near 4000 Hz is used for alarm of alarm clock and various warning sounds. By doing so you can make it efficient with less energy. 【3】Sounds that an olderly people can hear ・People get old and hard to hear. That is because hearing becomes aged human hearing loss which becomes difficult to hear high frequencies due to aging. Over the years I have been aging from a high frequency with high sensitivity by listening to various sounds. ・It is important to speak slowly and clearly with a big low voice to make it easy to hear, as it becomes difficult to hear high frequency consonants included in conversation when it becomes senile deaf. →Because there is little subjective symptoms, it will progress from about 40s so be careful. ・Recently, there seems to be some lowering from 4000 Hz targeted for adults such as warning sounds of household electric appliances to a slightly lower frequency, which is regarded as universal design. 
《1》Transient deafness 《2》Noisy deafness 
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