Polygraph instrument | Polygraph, lie detector explained

Analog polygraph instrument

Polygraph literally means “poly = many” “graph = writing”. This is the description of the graphical physiological data that the instrument is capable of registering in the form of charts.

These charts are the result of controlled stimulus presentations to an examinee. The charts reflect the psycho-physiological activity that the stimuli generate in a tested person.

Based on this information, a trained professional can arrive to a conclusion on someone’s emotional responses.

The conclusion will depend on the design and objective of the test. When applied for detection of deception the objective is to obtain an opinion on the credibility of someone’s testimony.

To know more about the history of lie detection please visit the Polygraph history page.

If you are searching for information on the instrument, please visit the following page.

We invite you to visit our F.A.Q. page to find an answer to the most common questions about polygraph or visit the following page if you would like to know how a test functions.

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