What Does a Polygraph Examiner Do?

Lie detector (lie detector) A translation of "lie detector", also known as "multi-channel psychological test technology", "multiple loggers". An instrument that detects whether a subject is lying. It is designed based on the principle that the subject has certain physiological reactions due to lying. The lie-detection principle: When a liar fabricates a lie and fears that the lie will be exposed, he will often feel a certain psychological pressure, and produce psychological reactions such as tension, fear, anxiety, and guilt, and related physiological reactions. Such as breathing, rapid heartbeat, increased blood pressure, slight rise in body temperature, sweating, stomach contraction, abnormal digestion of secretions, release of more sugar into the blood from the liver, increased secretion of adrenaline, enlarged pupils, and muscle tremors. This series of physiological responses are controlled by the human autonomic nervous system and are involuntary. Measuring these physiological changes can determine whether the subject is lying. ^[1]