What is polygraph paper?

The Polygraph and Lie Detection. Because the original analog instruments recorded the data with several pens writing lines on a moving sheet of paper, the record of physiological responses during the polygraph test is known as the polygraph chart.

What are the concepts of polygraph examination?

A polygraph, popularly referred to as a lie detector test, is a device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.

What is the purpose of polygraph?

The primary purpose of the polygraph test in security screening is to identify individuals who present serious threats to national security. To put this in the language of diagnostic testing, the goal is to reduce to a minimum the number of false negative cases (serious security risks who pass the diagnostic screen).

What are the general responses recorded by a polygraph?

The instrument typically used to conduct polygraph tests consists of a physiological recorder that assesses three indicators of autonomic arousal: heart rate/blood pressure, respiration, and skin conductivity. Most examiners today use computerized recording systems.

Who is the father of polygraph?

William Moulton Marston
John Augustus LarsonLeonarde KeelerJames Mackenzie
Polygraph/Inventors

What are the 4 major components of polygraph machine?

The four Major components

• PNEUMOGRAPH.
• CARDIOSPHYGMOGRAPH COMPONENT.
• GALVANOGRAPH COMPONENT.
• KEYMOGRAPH COMPONENT.

What is digital polygraph?

A digital polygraph also uses the pneumographs, but employs transducers to convert the energy of the displaced air into electronic signals. Blood pressure/heart rate – A blood-pressure cuff is placed around the subject’s upper arm. Tubing runs from the cuff to the polygraph.

What are the types of polygraph test?

Control Question Test (CQT), Guilty Knowledge Test (GKT) or Concealed Information Test (CIT) and Neuroscience-Based Advanced Polygraph Tests are the important types of polygraph tests used today.

What are the major parts of polygraph machine?

The three components of the polygraph instrument include the cardio-sphygmograph, the pneumograph, and the galvanograph. Blood pressure and heart rate are measured by the cardio-sphygmograph component of the polygraph, which consists of a blood pressure cuff that is wrapped around the subject’s arm.

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