Which test is commonly known as a lie detector test?

The polygraph test is commonly referred to as a lie detector test because it measures physiological responses that are believed to be associated with truthfulness or deception. The test typically records changes in heart rate, blood pressure, respiration, and skin conductivity while the individual answers a series of questions. The underlying assumption is that deceptive answers will trigger noticeable physiological changes compared to truthful responses.

While other tests like the psychometric test, clinical assessments, and behavioral analyses may evaluate psychological states or behaviors, they do not specifically aim to detect lies through physiological measurements. The polygraph's focus on quantifying the body's responses to questions about honesty makes it the most recognized and specific method associated with lie detection.