Here's a breakdown of the concept:
* Polygraph: An instrument that measures and records physiological responses, such as heart rate, blood pressure, respiration, and skin conductivity (sweat). It is used in attempts to detect deception.
* Polygraphy: The act of using a polygraph to conduct an examination. This involves asking a person a series of questions while monitoring their physiological responses.
* Lie Detection: The polygraph is not a true "lie detector." It actually detects physiological changes that can occur due to stress, anxiety, or other factors. A trained examiner interprets these changes in an attempt to determine whether the individual is being deceptive.
Important Considerations:
* Scientific Validity: The scientific validity of polygraph testing is highly contested. Some researchers argue that it can be unreliable and prone to false positives or negatives.
* Ethical Concerns: There are ethical concerns surrounding the use of polygraph tests, especially in situations where individuals may feel pressured or coerced to take the test.
* Legal Standing: Polygraph results are generally not admissible as evidence in court in the United States.
In summary, polygraphy involves the use of a polygraph to attempt to detect deception by measuring physiological responses. However, its scientific validity and ethical implications remain subject to debate.