'Lie detector machine' was used for the first time on this day (Image Source:
Lifestyle Desk, New Delhi. Did you know that when a person lies, his body can betray him? Actually, the day of 18 January 1951 is very special in history, because on this day 'Lie Detector Test' was used for the first time in the Netherlands.
This is a technology that tries to detect truth and lie by measuring a person's heartbeats and breathing. Let us know about the interesting history of this machine and how it works (How Lie Detector Works).
Even though its first major use took place in 1951, this technology had already been invented about 30 years before that. It was created by John Augustus Larson in the year 1921. Larsen's specialty was that along with being a scientist, he was also a police officer. He designed a device that could record the changes in a person's body while answering questions.
After all, how does this machine work?
Lie detector is also called 'polygraph'. This machine does not directly tell whether someone is telling the truth or lying. This machine simply measures your body's signals. When a person has a test, the machine records his or her heartbeat, blood pressure, breathing rate, and skin moisture.
The theory behind this is that when a person lies, he feels mental pressure. Due to this pressure, changes occur in the processes of his body, which are captured by the machine.
What happens during the test?
During the test, the person is connected to the machine and asked questions. The machine keeps recording the body's reactions in the form of a graph. In the beginning general questions are asked and then gradually questions related to investigation come. If there is a sudden change in the body's response or graph to a particular question, then experts become suspicious of that person.
However, it is important to note that this test is not considered completely scientific evidence, but it plays an important role in the investigation.
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