AP PSYCHOLOGY

Detailed explanation-1: -The polygraph is the best-known technique for psychophysiological detection of deception. The goal of all of these techniques is to detect deception by analyzing signals of changes in the body that cannot normally be detected by human observation.

Detailed explanation-2: -The goal of lie detection is the discovery of a truth that is known to one person and concealed from others. Psychophysiological lie detection, or polygraphy, is based on the theory that lying produces particular emotions, which produce corresponding measurable physiological responses.

Detailed explanation-3: -The polygraph is based on the premise that an individual who is lying will have subtle but measurable changes in specific physical indicators. Lie detectors utilize sensors placed on the test subject to record respiration, heart rate, blood pressure, and galvanic skin response or moisture in the fingertips.

Detailed explanation-4: -What is the most commonly used technique used for lie detection in criminal investigations? The standard polygraph is often the CQT since it is most often used in criminal investigations. The CQT often asks the suspect two types of questions – control questions and relevant questions.