Question

Test based on the principle of suspect’s reaction, if he witnesses an event then he behaves in a certain way is?

• A. Narcoanalysis
• B. Brain mapping
• C. Truth serum testing
• D. Polygraph

Answer 1

The Correct Option is D

In forensic medicine, determining a suspect's reaction when witnessing an event can be crucial in an investigation. One method utilized to observe such reactions is the use of a polygraph test.

A polygraph, commonly known as a lie detector test, measures physiological responses to questions. These responses include changes in heart rate, blood pressure, respiration, and skin conductivity. The theory behind a polygraph test is that certain physiological responses are triggered when a person is deceptive or experiencing stress related to lying.

The polygraph machine records these physiological signals while the subject answers a series of questions. By analyzing the data, trained examiners can often determine whether the subject's physiological responses are consistent with truthful answers or suggest potential deception.

This method differs from techniques like narcoanalysis, brain mapping, or truth serum testing. Narcoanalysis involves administering drugs to lower inhibitions, brain mapping attempts to identify specific neural responses associated with recognition or deception, and truth serums are intended to make subjects more prone to revealing truthful information.