lie detection

Question 1

Polygraph Test

Answer 1

Measures physiological responses

Question 2

Polygraph Physiological Responses

Answer 2

• Blood pressure
• Heart rate
• Breathing rate
• Galvanic skin response (GSR)

Question 3

GSR (Galvanic Skin Response)

Answer 3

Amount of current conducted by placing two electrodes on the skin (higher reading produced)

Question 4

Activation of the Sympathetic Nervous System

Answer 4

Increased Sweat (GSR: increases electric currents produced)

Question 5

Limitations of Polygraphs

Answer 5

• Assumes lying causes physiological arousal
• Assumes a person who lies feels guilt and will have a physiological reaction
• Only detects physiological responses
• Emotions cause the same physiological responses

Question 6

Concealing Knowledge (Polygraph)

Answer 6

Causes a change in physiological response which the polygraph will detect

Question 7

Recognition

Answer 7

Harder to hide than fear or guilt

P300 brainwave

Question 8

Electroencephalograph (EEG)

Answer 8

Records brainwave patterns (P300 response cannot warrant guilt)

Question 9

Functional Magnetic Resonance Imaging (fMRI)

Answer 9

Detects frontal love ant ACC activity

Question 10

Lying Activates

Answer 10

Frontal lobe and anterior cingulate cortex (ACC) more than other areas

Question 11

fMRI and Guilty Knowledge Test

Answer 11

• Increased likelihood of detecting a lie
• Damage to the frontal lobe (anti-social personality disorder) shows no increased activity (unreliable)

Question 12

Heat Sensor Camera

Answer 12

Senses increase in blood flow to the eyes (occurs when someone is lying)

• Quick to administer, easy to read

Question 13

Research in Lie Detection

Answer 13

Current Research: Experimental conditions in a lab which might not reflect real-world situation