No sound How does "silence" affect the human body?


ByNikola Ostrun

People who live in a busy city say "I want to go to a quiet place occasionally away from the bustle", but it may be because the body is seeking silence. In recent years, research has progressed on the positive influence that "silence" gives to the human brain.

This Is Your Brain on Silence - Issue 16: Nothingness - Nautilus
http://nautil.us/issue/16/nothingness/this-is-your-brain-on-silence

Empirical rules can understand that unpleasant noise exhausts the mind and body. People who live in a noisy environment full of noise on a daily basis are often said to be in a state of high chronic stress hormone levels.

Sound is not limited to noise, the part known as "spiral tube" in the ear -Cochlea(Kagyu) feel it by converting physical air vibrations into electrical signals and transmitting them to the brain, and this mechanism is surprised at sudden sounds, for example, because it functions even in a state of deep sleep. So there is something to wake up.

ByOxfam International

In 2011World Health Organization(WHO) announced, "There are about 3 million people suffering health damage due to unpleasant noise in Western Europe and the USA, respectively, 3000 of the lost lost due to heart disease is caused by excessive noise I have been reporting that it was brought down.

It has long been known that "sound can adversely affect health"Florence · Nightingale"Unnecessary noise is the most vulnerable and careless situation of care insufficiency" and expresses that the cause of sudden death by children is noise. And this Nightingale claim that again in the middle of the 20th century, epidemiologists were once again in the limelight as a correlation between noise problems caused by chronic expressways and airports and high blood pressure was discovered.


I knew that sound affected health like this in this way, but what about "How does silence", which is the state without sound, affect the human body? It was not. However, in an experiment to examine "the influence of music on human physiological phenomena" performed by physician Luciano Bernardi in 2006, the effect of silence was found by chance.

Dr. Bernardi told 12 subjects to hear 6 kinds of music and observed the blood pressure, the blood carbon dioxide concentration, and the blood flow in the brain during that period, and found that the same state that the body was awake in any music The physiological change of the thing occurred. However, during the two-minute interval between the song and the song, I found that the body is in a much more relaxed state than when playing music. From this moment, the blank time, which was considered to have no meaning, became the most interesting research subject of Dr. Bernardi.

Dr. Bernardi says that the stimulation of noise concentrates the spirit in one direction, in other words, silence without stimulation may make the spirit deep and relaxed. " . A paper on Doctor Bernardi's "The influence of silence" was published in 2006Heart JournalIt became the most downloaded article in the paper published at.

ByCarlo alberto aldi

Dr. Michael Wear who studies cranial nerves at the University of Oregon in 2010 observed the response to the brain when he heard a loud noise on the mouse, whereas in the case of intermittent sounds a specialized auditory cortexNeuronIn contrast to the activation of the network to the contrary, even if sounds of similar size are serially issued, we found that the neurons of the mouse brain show a stopped state. Until then, it is known that animals respond strongly at the moment the sound disappears, and this was thought to be able to cope with sudden danger, but due to the results of Dr. Wear's research, the brain started silence It was clearly demonstrated that brain neurons react strongly at times. In other words, it is easy to think that there is no sound in general "state where there is no input", but the brain recognizes the moment when the sound suddenly disappears as "input", and if there is no sound after that, auditory cortical activity The mechanism that stops it is revealed.

In 2013, a biologist at Duke University, Dr. Inke Kilste examined "the influence of silence" using a mouse, and found that the hippocampus in the brain area involved in memory can be improved by giving 2 hours of silence per day I discovered that it develops. "If you could demonstrate the causal relationship between silence and brain cell development in human beings," quiet therapy "is a method of treating hippocampal-related symptoms such as dementia and depression It may be used as ".


However, some neurologists claim that there is no "true silence". Dr. David Kremer of Dartmouth University says, "For example, if you listen to songs that you know well on the radio, and suddenly that music stops, that song will continue to flow in your head" It explains that there are cases where the auditory cort of the brain may continue the active state even if the sound disappears as a result of the memory acting.

It is clear that such brain work is called "background activity" and accounts for the majority of the energy consumed by the brain. It is known that brain energy consumption increases by only a few percent even when performing pattern recognition and complicated calculations, etc. It is known that it is very difficult to completely rest the brain.

Although it is often not clarified yet what kind of influence will be caused to the brain due to silence, for example, in recent years, such as a luxury headphone with noise canceling function and a tour to experience meditation, "silence" Business is getting increasingly popular. In addition, the Finnish tourist office considers "the quiet environment is an important tourism resource", and said that it actively sells a quiet environment as an excellent advantage. At first sight, it seems to be said that the fact that many people are asking without spending money "silence" which seems to be "nothing only" can tell the effect of "silence" straight.

in Science, Posted by darkhorse_log