Question:medium
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
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: Read the principle in the stem: it measures how the body reacts when a person who witnessed an event is questioned about it. That points to recording autonomic responses.
Step 2: The polygraph is the instrument that continuously tracks blood pressure, heart rate, breathing and skin conductance, and interprets deviations as signs of stress, deception or recognition.
Step 3: Exclude the others by mechanism. Narcoanalysis and truth serum rely on drug-induced disinhibition so the subject talks, and brain mapping captures evoked EEG potentials, neither of which is the autonomic-reaction test described.
Step 4: The match is the polygraph.
\[\boxed{\text{Polygraph}}\]
Step 2: The polygraph is the instrument that continuously tracks blood pressure, heart rate, breathing and skin conductance, and interprets deviations as signs of stress, deception or recognition.
Step 3: Exclude the others by mechanism. Narcoanalysis and truth serum rely on drug-induced disinhibition so the subject talks, and brain mapping captures evoked EEG potentials, neither of which is the autonomic-reaction test described.
Step 4: The match is the polygraph.
\[\boxed{\text{Polygraph}}\]
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