A lie detector, also known as a polygraph test, is a device used to detect whether a person is telling the truth or lying. This machine measures the person's physiological changes, such as blood pressure, pulse rate and breathing, assuming these changes occur in the person's body when they lie down.
But can this machine really reveal the truth?
The answer to this question is complex. Proponents of the polygraph test say it is a reliable tool that can help catch criminals and uncover the truth. They claim that this machine can accurately measure the physiological changes of a person who is lying.
However, critics of the polygraph test say that this machine is unreliable and can give false results. They say that many factors can influence a person's physical changes, such as anxiety, stress, and health conditions. Furthermore, liars can be adept at hiding their emotions, thereby deceiving the machine.
How does a polygraph test work?
In a polygraph test, the person is asked a series of questions, including some control questions whose answers are definitely known. The person's physical changes are recorded by the machine and compared with answers to control questions. If the person's physical changes differ from the answers to the control questions, it is assumed that he or she is lying.
Limitations of Polygraph Test
Polygraph tests have several limitations, including:
The polygraph test is a controversial instrument whose reliability continues to be debated. This machine can be helpful in some cases, but it should be used with caution. It is important to remember that a polygraph test is not 100% accurate and can give false results.
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