Which device is commonly used to detect lies by measuring physiological responses?

Which device is commonly used to detect lies by measuring physiological responses?

• A. Polygraph
• B. Facial Feedback
• C. Arousal
• D. Behavior Feedback Effect

Answer: (A)

The idea being tested is lie detection through measuring bodily responses. A polygraph is the instrument that records several physiological signals—like heart rate, blood pressure, breathing, and skin conductance—while someone answers questions, with the assumption that deception can produce distinctive arousal patterns. It’s the best answer here because it is a device specifically designed to detect lies by tracking these physiological changes. The other options describe concepts rather than a tool for lie detection: facial feedback focuses on how facial expressions influence emotions, arousal is the general physiological state being measured, and the behavior feedback effect explains how our actions can influence how we feel, not a method for detecting deception.

The idea being tested is lie detection through measuring bodily responses. A polygraph is the instrument that records several physiological signals—like heart rate, blood pressure, breathing, and skin conductance—while someone answers questions, with the assumption that deception can produce distinctive arousal patterns. It’s the best answer here because it is a device specifically designed to detect lies by tracking these physiological changes. The other options describe concepts rather than a tool for lie detection: facial feedback focuses on how facial expressions influence emotions, arousal is the general physiological state being measured, and the behavior feedback effect explains how our actions can influence how we feel, not a method for detecting deception.