The polygraph measures
A) changes in emotional arousal associated specifically with deception
B) changes in blood pressure, voice modulation, and perspiration
C) changes in blood pressure, respiration, and palmar sweating
D) increases in emotional arousal in response to the control question compared to the relevant question, indicative of deception
E) changes in blood pressure, brain-wave activity, and respiration

Question

Quizplus · Accepted Answer

The polygraph measures changes in blood pressure, respiration, and palmar sweating. While changes in emotional arousal may be associated with deception, the polygraph does not specifically measure this. Brain-wave activity and voice modulation may also be measured in some polygraph tests, but these are not the main components of the test. Option D is also incorrect as the polygraph does not compare specific control and relevant questions to indicate deception.

The Polygraph Measures