Lie Detection Techniques Review Questions 1
Lie Detection Techniques Review Questions 1
1. Which component of a polygraph records changes in respiration?
A. Cardiosphygmograph
B. Pneumograph
C. Galvanograph
D. Kymograph
Answer: B. Pneumograph
Explanation: The pneumograph is the component that records respiratory activity, particularly changes in the rate and depth of breathing.
2. Which component records changes in blood pressure and pulse rate?
A. Pneumograph
B. Galvanograph
C. Cardiosphygmograph
D. Cardiograph
Answer: C. Cardiosphygmograph
Explanation: The cardiosphygmograph records cardiovascular activity, including changes in blood pressure and pulse rate.
3. Which component measures changes in the electrical resistance of the skin?
A. Pneumograph
B. Galvanograph
C. Cardiosphygmograph
D. Sphygmomanometer
Answer: B. Galvanograph
Explanation: The galvanograph records changes in electrodermal activity (EDA) or galvanic skin response (GSR). These changes are associated with variations in the skin's electrical conductivity or resistance.
4. Which polygraph component is primarily concerned with respiration?
A. Galvanograph
B. Cardiosphygmograph
C. Pneumograph
D. Cardiograph
Answer: C. Pneumograph
Explanation: The pneumograph uses respiration sensors or tubes placed around the subject's chest and/or abdomen to detect and record breathing movements.
5. Which component detects cardiovascular changes through a blood-pressure cuff?
A. Pneumograph
B. Cardiosphygmograph
C. Galvanograph
D. Pneumometer
Answer: B. Cardiosphygmograph
Explanation: The cardiosphygmograph uses a cardio cuff or similar cardiovascular sensor to detect changes associated with blood pressure and pulse.
6. What component of the polygraph detects changes in skin conductivity?
A. Electrodes
B. Pneumograph tubes
C. Cardio cuff
D. Chart drive
Answer: A. Electrodes
Explanation: Electrodes, usually attached to the fingers or palm, detect changes in skin conductivity caused by variations in sweat-gland activity. They work as part of the galvanic/electrodermal channel.
7. Which component moves the recording medium during a traditional analog polygraph examination?
A. Chart drive
B. Galvanograph
C. Pneumograph
D. Cardiosphygmograph
Answer: A. Chart drive
Explanation: The chart drive moves the recording chart at a controlled speed, allowing physiological responses to be recorded continuously over time.
8. Which component provides the recording surface in a traditional analog polygraph?
A. Chart
B. Cuff
C. Electrode
D. Sensor
Answer: A. Chart
Explanation: The chart is the recording medium on which physiological changes are displayed. Modern computerized polygraphs may record the data electronically rather than on paper.
9. Which component is placed around the subject's chest or abdomen to monitor breathing?
A. Cardio cuff
B. Pneumograph tube
C. Finger electrodes
D. Blood-pressure bulb
Answer: B. Pneumograph tube
Explanation: Pneumograph tubes are placed around the chest and/or abdomen. Changes in their tension or movement correspond to changes in respiratory activity.
10. Which group correctly identifies the three primary physiological channels traditionally measured by a polygraph?
A. Respiration, cardiovascular, electrodermal
B. Vision, hearing, pulse
C. Temperature, vision, hearing
D. Muscle, vision, respiration
Answer: A. Respiration, cardiovascular, electrodermal
Explanation: The three principal physiological measurements are:
Respiration — measured by the pneumograph.
Cardiovascular activity — measured by the cardiosphygmograph.
Electrodermal activity — measured through skin electrodes/galvanic recording.
Quick review:
Pneumograph = breathing
Cardiosphygmograph = blood pressure and pulse
Galvanograph = skin conductivity
Electrodes = detect electrodermal changes
Chart drive = moves the recording chart
11. What does a polygraph primarily record?
A. Brain waves
B. Physiological changes
C. Fingerprints
D. Body temperature
Answer: B. Physiological changes
Explanation: A polygraph records physiological responses such as respiration, cardiovascular activity, and skin conductance that may change during questioning.
12. Which is commonly called the “lie detector”?
A. Polygraph
B. Photometer
C. Spirometer
D. Spectrometer
Answer: A. Polygraph
Explanation: The polygraph is commonly known as a “lie detector” because it measures physiological responses associated with questioning.
13. Which component measures respiration?
A. Pneumograph
B. Galvanometer
C. Cardio cuff
D. Thermometer
Answer: A. Pneumograph
Explanation: Pneumographic sensors monitor changes in the subject's breathing patterns.
14. Which component records cardiovascular activity?
A. Pneumograph
B. Cardiograph
C. Galvanometer
D. Electrode
Answer: B. Cardiograph
Explanation: The cardiovascular channel records changes related to pulse and blood pressure.
15. What does the galvanic skin response measure?
A. Muscle strength
B. Skin conductivity
C. Blood pressure
D. Brain activity
Answer: B. Skin conductivity
Explanation: The galvanic skin response (GSR) measures changes in electrical conductance of the skin, which can vary with perspiration.
16. Which question is designed to address the specific issue being investigated?
A. Relevant question
B. Neutral question
C. Irrelevant question
D. Personal question
Answer: A. Relevant question
Explanation: A relevant question directly concerns the matter under investigation.
17. What is the main purpose of a comparison question?
A. Establish identity
B. Provide comparison responses
C. Obtain fingerprints
D. Measure intelligence
Answer: B. Provide comparison responses
Explanation: Comparison questions are used to obtain physiological responses that can be evaluated alongside responses to relevant questions.
18. Which phase normally involves asking the subject the prepared questions while physiological responses are recorded?
A. Pre-test
B. Chart collection
C. Post-test
D. Identification
Answer: B. Chart collection
Explanation: During chart collection, the examiner presents the test questions and records the subject's physiological responses.
19. What is the purpose of the pre-test interview?
A. Arrest the subject
B. Explain the procedure
C. Collect fingerprints
D. Determine guilt
Answer: B. Explain the procedure
Explanation: The pre-test phase generally establishes rapport, explains the examination, reviews the questions, and prepares the subject for testing.
20. A polygraph result should primarily be interpreted as evidence of:
A. Deception with certainty
B. Physiological responses
C. Criminal personality
D. Guilt beyond a reasonable doubt
Answer: B. Physiological responses
Explanation: A polygraph directly measures physiological responses, not truth or deception itself. Interpretation requires a trained examiner and should not automatically be equated with proof of guilt.
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