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Home Science & Tech

Polygraph Test 

November 10, 2020
in Science & Tech
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Polygraph Test 
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A local court of Uttar Pradesh permitted Police to conduct polygraph test on five accused in Unnao case

What is a polygraph test? 

  • Also called Lie-Detection Test,  it is a psycho-biological test to check the veracity of statements on computerized equipment known as a lie-detector or polygraph. 
  • The polygraph test is based on the theory that a person who is lying to a question will produce a physiological response that is different from those that arises in a normal course. 
  • Instruments such as cardiographs, pneumographs and sensitive electrodes are used to measure the changes in respiration, blood pressure and pulse.
  • Based on the records of psychological response, the truthfulness or falsity is accessed.

Polygraph test measures the following autonomic nervous system activities in the form of graphs:

  • Abdominal respiration 
  • Thoracic respiration
  • Galvanic skin resistance (GSR) 
  • Blood pressure/pulse rate
  • Muscular pressure
  • Finger pulse 
  • Skin temperature
Source: The Hindu & National Institute of Criminology & Forensic Science
Tags: Prelims

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