Which instrument is designed to measure physiological signals to infer deception?

Which instrument is designed to measure physiological signals to infer deception?

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

Answer: (A)

Measuring physiological signals to infer deception relies on monitoring bodily responses that often accompany arousal when someone lies. The polygraph is built for this purpose, recording several physiological channels at once—breathing changes, skin conductance, heart rate, and blood pressure. By comparing responses to relevant questions with responses to control questions, it aims to reveal deception through differential arousal. While it’s designed for this use, results aren’t definitive—anxious truth-tellers, countermeasures, or other factors can produce similar patterns, so interpretation must be cautious. Arousal is a physiological state, not a measurement tool. Facial Feedback concerns how facial movements influence emotions rather than collecting signals for deception. The Behavior Feedback Effect describes how actions can influence thoughts or feelings, not about measuring deception-related physiological signals.

Measuring physiological signals to infer deception relies on monitoring bodily responses that often accompany arousal when someone lies. The polygraph is built for this purpose, recording several physiological channels at once—breathing changes, skin conductance, heart rate, and blood pressure. By comparing responses to relevant questions with responses to control questions, it aims to reveal deception through differential arousal. While it’s designed for this use, results aren’t definitive—anxious truth-tellers, countermeasures, or other factors can produce similar patterns, so interpretation must be cautious.

Arousal is a physiological state, not a measurement tool. Facial Feedback concerns how facial movements influence emotions rather than collecting signals for deception. The Behavior Feedback Effect describes how actions can influence thoughts or feelings, not about measuring deception-related physiological signals.