A polygraph, commonly known as a lie detector test, measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while the subject is asked and answers a series of questions. The premise is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers.

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What Is a Polygraph

Question 14

Multiple Choice

What is a polygraph?

A) A device that measures sensitive changes in vocal expression (such as pitch, tone, etc.) in an effort to detect lying.
B) A device that uses electrodes attached to the skin to measure changes in muscle tension (fidgeting) which correlates with dishonest communication.
C) A general device that measures and records several physiological variables such as blood pressure, pulse, respiration and skin conductivity.
D) None of the above.

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