Polygraph

A polygraph is a device that is used to measure a person's physiological responses to various stimuli. It includes devices that measure heart rate (pulse), blood pressure, skin temperature, sweating and many other parameters. The data is collected into a computer, which processes the information and produces results.

The polygraph is widely used in law enforcement agencies and other institutions where it is important to detect lies and deception. With its help, you can determine whether a person is really telling the truth or whether he is hiding something from the investigation.

However, there is also criticism of the use of the polygraph. Some scientists believe that using this device could lead to false accusations of crimes and violates the right to privacy. Additionally, due to errors and misuse, the polygraph may be ineffective in detecting lies, causing further confusion and mistrust among the public.

**Another important aspect of using a polygraph is the psychological processing of the person being interrogated.** The person is presented with various questions that stimulate the functioning of his brain and are usually aimed at emotions. This can affect the mood and general state of the interrogated person, because negatively evoked emotions will confuse the analysis of the polygraph procedure, since, for example, hidden emotions can hide a lie.