The theory underlying the use of the polygraph is basically that there is a relationship between a person's state of mind ad his/her physiological state.

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The theory behind the polygraph is that deceptive answers will produce physiological responses that can be measured and recorded by the machine, indicating a relationship between psychological states (such as lying) and physiological responses (such as increased heart rate, blood pressure, or sweating).

The Theory Underlying the Use of the Polygraph Is Basically