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POLYGRAPH -By Saniya Zedi
Assistant Professor BU
WHAT IS POLYGRAPH?
A polygraph, often called a “Lie Detector,” is a machine that measures
human responses to questions, measuring a lot of physiological
symptoms of anxiety or emotion to estimate if the subject is being
truthful or not.
INVENTORS
• William Moulton Marston : creator of the systolic blood pressure
test - one component of the modern polygraph.
• John Augustus Larson : first American police officer to use
polygraph in criminal investigations.
• Leonarde Keeler : was the co-inventor of the polygraph.
WORKING
Polygraph machine records multiple signals using 4 to 6 sensors
attached to the patient’s body. The sensors usually record:
• The person's breathing rate
• The person's pulse
• The person's blood pressure
• The person's perspiration
HOW DOES IT WORK
The Nervous System reacts to different situations differently. For this,
it uses different parts of it, namely :
I. Somatic Nervous System
II. Autonomic Nervous System Arousal- Increased ANS
activity- LIE
INSTRUMENTATION
Cardio – Sphygmograph : collects blood pressure and heart
rate data
Pneumograph : measures respiratory patterns
Galvanograph : measures electro-dermal activity or sweat
ADMINISTRATION OF TEST
• Familiarizing the subject with the test
• Pre-test Interview
• Formulating Questions
Relevant/ Irrelevant questionnaire
• Analysis of the result
ERRORS
Research claims polygraph test has error rates from 15%-40%.
Some individuals are habitual of control breathing, meditation etc can
be a parameter of error in results.
Genuinely scared individual can pose error.
Physical disability and diseased condition.
PRACTICE
Q1- Where is Polygraph Required?
Q2- What instruments are used in Polygraph? Mention names.
Q3- Define Forensic Psychology.
Q4- Principle of Polygraph.
Q5- Would you want to be a Forensic Psychologist? Yes/No Support
your answer.

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Polygraph

  • 1. POLYGRAPH -By Saniya Zedi Assistant Professor BU
  • 2. WHAT IS POLYGRAPH? A polygraph, often called a “Lie Detector,” is a machine that measures human responses to questions, measuring a lot of physiological symptoms of anxiety or emotion to estimate if the subject is being truthful or not.
  • 3. INVENTORS • William Moulton Marston : creator of the systolic blood pressure test - one component of the modern polygraph. • John Augustus Larson : first American police officer to use polygraph in criminal investigations. • Leonarde Keeler : was the co-inventor of the polygraph.
  • 4. WORKING Polygraph machine records multiple signals using 4 to 6 sensors attached to the patient’s body. The sensors usually record: • The person's breathing rate • The person's pulse • The person's blood pressure • The person's perspiration
  • 5.
  • 6. HOW DOES IT WORK The Nervous System reacts to different situations differently. For this, it uses different parts of it, namely : I. Somatic Nervous System II. Autonomic Nervous System Arousal- Increased ANS activity- LIE
  • 7. INSTRUMENTATION Cardio – Sphygmograph : collects blood pressure and heart rate data Pneumograph : measures respiratory patterns Galvanograph : measures electro-dermal activity or sweat
  • 8. ADMINISTRATION OF TEST • Familiarizing the subject with the test • Pre-test Interview • Formulating Questions Relevant/ Irrelevant questionnaire • Analysis of the result
  • 9.
  • 10. ERRORS Research claims polygraph test has error rates from 15%-40%. Some individuals are habitual of control breathing, meditation etc can be a parameter of error in results. Genuinely scared individual can pose error. Physical disability and diseased condition.
  • 11. PRACTICE Q1- Where is Polygraph Required? Q2- What instruments are used in Polygraph? Mention names. Q3- Define Forensic Psychology. Q4- Principle of Polygraph. Q5- Would you want to be a Forensic Psychologist? Yes/No Support your answer.