Question:
Which forensic test is based on the principle that a suspect who has witnessed an event reacts in a certain measurable physiological way when confronted with stimuli related to it?
Which forensic test is based on the principle that a suspect who has witnessed an event reacts in a certain measurable physiological way when confronted with stimuli related to it?
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Records BP, pulse, respiration and skin response to questions: the lie detector.
Updated On: Jun 23, 2026
- Narcoanalysis
- Brain mapping
- Truth serum testing
- Polygraph
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The Correct Option is D
Solution and Explanation
Step 1: The stem describes a test that records the suspect's involuntary physiological reactions to event-related stimuli to infer deception or recognition.
Step 2: The polygraph (lie detector) does exactly this. It simultaneously records changes in blood pressure, pulse, respiration and galvanic skin response while the subject answers questions, and altered responses suggest deception or recognition of the event.
Step 3: The distractors work differently. Narcoanalysis and truth serum testing use drugs such as sodium pentothal to lower inhibition so the subject speaks freely. Brain mapping (P300 / brain electrical oscillation signature) records EEG responses rather than autonomic reactions.
Step 4: The test built on the suspect's physiological reaction pattern is the polygraph, option d.
Step 2: The polygraph (lie detector) does exactly this. It simultaneously records changes in blood pressure, pulse, respiration and galvanic skin response while the subject answers questions, and altered responses suggest deception or recognition of the event.
Step 3: The distractors work differently. Narcoanalysis and truth serum testing use drugs such as sodium pentothal to lower inhibition so the subject speaks freely. Brain mapping (P300 / brain electrical oscillation signature) records EEG responses rather than autonomic reactions.
Step 4: The test built on the suspect's physiological reaction pattern is the polygraph, option d.
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