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Chapter 10: Problem 9

A polygraph (lie detector) works by: A. monitoring physiological indices of autonomic arousal. B. directly assessing the truthfulness of a person's statements. C. monitoring the person's facial expressions. D. all of the above.

Short Answer

Expert verified
Answer: A. Monitoring physiological indices of autonomic arousal.

Step by step solution

01

Option A: Monitoring physiological indices of autonomic arousal.

Polygraphs work by measuring the subject's physiological responses such as blood pressure, heart rate, and sweating rates. These are all indicators of autonomic arousal, which is the body's response to stressors or stimuli. So, option A is correct.
02

Option B: Directly assessing the truthfulness of a person's statements.

Polygraphs do not directly assess the truthfulness of a person's statements; rather, they measure the physiological reactions that might indicate whether a person is deceptive or not. So, option B is incorrect.
03

Option C: Monitoring the person's facial expressions.

While facial expressions can sometimes reveal emotions and deception, polygraphs do not specifically monitor facial expressions. They are mainly focused on physiological responses. So, option C is incorrect.
04

Option D: All of the above.

Since options B and C are incorrect, option D, which includes all the options, is also incorrect. Therefore, the correct answer is: A. Monitoring physiological indices of autonomic arousal.

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