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Lecture

lect 2-law.docx

6 Pages
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Department
Psychology
Course Code
PSYC 3310
Professor
Justin Friesen

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Description
Polygraph method: - Based on the belief that deception is related to physiological change - Measures - Respiration - Heart rate - Sweating William Mastron - Originator of the modern polygraph - AND creator of wonder woman Uses of polygraph - Helps in criminal investigations (suspect is asked to take a polygraph test) - Verify a crime has occurred (victim is asked to take a polygraph test) - Monitoring sexual offenders on probation (united states) - Pre-employment screening for security agencies and police Comparison question test - Includes three types of questions: - Irrelevant - Relevant (based on crime/suspicion) - Comparison (honesty, and past history) - Deception is assessed by comparing physiological responses between relevant and comparison questions Comparison question test: sample quetsion Question purpose Example Irrelevant Used to obtain a baseline Are you left handed? Relevant Deal with the crime Did you assault Sam Smith on march 11th? Comparison Deal with prior antisocial behaviour Before age 25, did you ever verbally threaten to hurt anyone? Phases of the CQT - People getting interviewed HAVE to believe that the test works - Pre-test interview: interview with suspect to develop the comparison question - Polygraph exam: question are asked while suspect's physiological responses are measured - Scoring: polygraph examiner scores the physiological responses to determine if the suspect is truthful, deceptive, or inconclusive - Post-test interview: if a suspect is judged deceptive they are pressured to confess Comparison question test: assumptions - assumes guilty people react more to relevant questions and innocent people react more to comparison questions - suspect falsely accused of a crime might react more strongly to questions about the crime than to vague questions concerning past behaviour Concealed information test - Assesses it suspect has information that only the criminal would know - Asks suspects multiple-choice questions, one option is correct - Assumes if the suspect is guilty they will react strongly to correct information - Rarely used in canada or united states Types of polygraph studies - Laboratory studies - ground truth is known (who is guilty and who is innocent in that ques)
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