Ch.4 - Deception Flashcards
What are the signs of deception?
- Emotional Arousal
- Facial Expressions ( Microexpressions)
Define Emotional Arousal
Physical bodily responses ( sweating, heart-rate up,etc.)
What are Microexpressions
very short leakage of emotion
Emotional leakage
can’t hold back true feelings and some slip out
What are some examples of emotional leakage
Eye contact = too much eye contact
Speech = slowed speech rate, long pauses, more hesitations, more errors
Behaviours = controlled and rigid, decreased hand gestures
Verbal = less detail, stories out of order and make less sense, voice pitch is higher
What is a polygraph based on ?
Based on the belief that deception is related to physiological changes
Measures:
Respiration
Heart rate
Blood pressure
Sweating
What would polygraphs be used in
Used in criminal investigations
Pre-employment screening for security agencies and police
Monitoring sexual offenders on probation (United States)
What are the 2 types of polygraph tests
Comparison Question Test (CQT)
Concealed Information Test (CIT)
Whats a con of the polygraph tests
May pressure people to confess (even if innocent) giving police incriminating evidence
What are the 3 Phases of the CQT
- Pre-test interview: Interview with to develop the comparison questions
- Polygraph exam: Questions are asked while suspect’s physiological responses are measured (scoring after this)
- Post-test interview: If a suspect is judged deceptive they are pressured to confess
What is an irrelevant question + ex
Used to obtain a baseline.
ex. Are you left-handed?
What is an relevant question + ex
Deal with the crime.
Did you assault Stan Smith on March 11th?
What is an comparison question + ex
Deal with prior antisocial behaviour.
ex. Before age 25, did you ever verbally threaten to hurt anyone?
What is a Concealed Information Test
Assesses if suspect has information that only the criminal would know
Asks multiple-choice questions, in which only one option is correct
Assumes if the suspect is guilty they will react strongly to correct information
What is the admissibility of Polygraph
Currently allowed in some U.S. states if agreed by both prosecution and defence
Not admissible into evidence in Canadian courts