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A polygraph (often called a lie detector) is actually a biomedical instrument. This device looks at and charts or logs a number of physiological characteristics (blood pressure, pulse, respiration, breathing rhythm, body temperature and the conductivity of skin) and the changes in these features as questions are asked of the subject and he answers.

The idea is to ask questions that establish a "baseline" physiology. If and when the subject provides false answers, changes in some "baseline" physiological factor will appear. These can provide some distinctive contrasts that could indicate that the individual is lying. The physiological changes monitored are controlled by the sympathetic nervous system, and as the questions are asked and answered, physiological responses are tracked. A link can be found below to check facts and learn more.

Polygraph

A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip of moving paper ("graph").

How does it work?

About 4 to 6 sensors are attached to body parts of a person during polygraph test and the sensors record data from these locations.

(see the link below)

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Flavio Mitchell

Lvl 13
2y ago

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