How does a lie detector work? Detailed answer

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How does a lie detector work? Detailed answer

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How does a lie detector work?

A lie detector is a device that measures the frequency of his pulse, respiration, blood pressure and electrical resistance of the skin (sweating intensity) during the interrogation of a person.

When a person lies, the first three indicators go up and the last one goes down. The fact is that any fairly normal person, when lying, is afraid that the truth will come out. This fear is always accompanied by the release of adrenaline, which changes the above physiological characteristics of the emotional state of a person.

A lie detector (another name for this device is a polygraph) was created in 1921 by American psychologists and police officers Augustus Larsen and Leonard Keeler.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What causes blindness?

Do you know that there are at least fourteen million blind people in the world? There are many degrees of blindness and therefore it is difficult to define it. Some people don't even see the light. Others can distinguish light from darkness, and nothing more. And still others have some percentage of vision. Of all the blind people on earth, only a small proportion are blind from birth.

Blindness from birth is called congenital. Its causes have not yet been fully elucidated. Blindness after birth is mainly the result of eye disease. General diseases of the body, such as diabetes or meningitis, can also cause blindness, and even more often than purely eye diseases. Accidents and explosions are two other causes of blindness.

In countries where life expectancy is higher due to good health care and a high standard of living, some visual changes often occur in older people. Cataracts and glaucoma may develop. Cataract is one of the most common causes of blindness. A cataract is a clouding of the lens of the eye. The lens, the transparent part of the eye through which light rays pass, becomes cloudy, and only very strong and bright rays of light can pass through it. The result is a significant loss of vision. Cataracts can only be removed by surgery.

In glaucoma, hardening of the eyeball occurs, accompanied by an increase in pressure inside the eye. Today, there are drugs that can treat glaucoma if it is detected in time. One of the main causes of vision loss is trachoma. This is an infectious disease caused by a virus that infects the inside of the eyelids, as well as the blood vessels on the cornea. As a result, the person may become blind. Now treated with antibiotics, trachoma remains common in parts of Europe, Africa and Asia.

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