Measurement of physiological arousal in breathing rate, hear rate, and blood pressure (which can mark emotional response) is also used in what modern application?

1. Modern application of Lie Detector Test or Polygraph

- It is believed that when a person is lying, there are significant changes in the breathing, heart rate and blood pressure when a person is put under questioning.

The changes in the emotional state of the person under question brings about the said increase in breathing rate, heart rate and blood pressure. This leads to detection of deception under the polygraph test.

Emotion is one of the responses of an organism (whole) which involves physiological arousal. Other than indicating emotion, physiological arousal or heightened physiological activity is modernly used in polygraphs. Polygraphs or lie detector notes changes in blood pressure, pulse, respiration while the subject is asked and answers questions. It is based on the assumption that dishonest answers are indicated with physiological arousal.