stages of memory
Encoding
Storage
Retrieval
Storing memory steps
attention encoding
sensory memory
short term memory
long term memory
Two factors/variables that influence eyewitness accounts
Estimator
System
Estimator variables
preset at the time of the crime and cannot be changed (age of witness)
System Variables
Can be manipulated to increase or decrease accuracy of witness ex: lineup procedure
Age as an estimator variable
older adults produce lower correct rejection rates than younger adults
Race as an Estimator variable/ cross race effect
Witnesses are able to remember faces of their own race more accurately than those of others
cross race effect may relate to
attitudes and interracial exposure
Weapon Focus
phenomenon where witness’ attention being focused on weapon rather than culprit
Attempts to explain weapon focus
-Cue utilization (because of emotional arousal person will focus on central detail not peripheral)
-Unusualness (weapon is unusual so focus on it)
conditions of Witness interview as system variable
witness may not feel comfortable, calm
interruptions
too many short-answer questions
relevant questions not asked
rushing
leading questions (misinformation effect)
two types memory retrieval eyewitness perform
Recall memory: reporting witnessed details
Recognition memory: determining if what is being seen/heard is the same as before
Live line up
real people are shown, suspect along with foils
simultaneous line up
foils match description
witnesses see all at same time
issues with simultaneous line up
results in relative comparison
police may give off cues
witnesses assume culprit is in line up
false positive up to 43%
sequential line up
One person is viewed at a time
‘Yes/No’, then on to the next if ‘No’
Results in Absolute Judgment (comparing individuals to witness’ memory)
Lower false positives (about 17%)
Photo Line-ups (Arrays)
Simultaneous or sequential
As good a live line-ups
More flexibility is offered
Video Line-ups
Relatively new
Supported by researchers
All the benefits of photo line-ups plus…
Show-ups
Yes or No?
debate
only used in death bed and immediate apprehension scenarios
Walk-by
Witness is taken to a real, public location to identify the culprit
Recommendations for line ups
The person who conducts the lineup should not be aware of who is the suspect
Eyewitnesses should be informed the culprit may not be present in the lineup
The suspect should not stand out
A clear statement regarding a witness’ confidence should be taken at the time of the identification
Pay careful attention to the potential errors made by police
The Misinformation Effect
Occurs when a witness is provided with inaccurate information about an event after it is witnessed and incorporates the ‘misinformation’ in their later recall (Loftus, 1975)
Hare’s Psychopathy Checklist-Revised (PCL-R)
is the most popular method of assessing psychopathy in adults
-20-item scale
-Semi-structured interview and review of file information
-Assesses interpersonal, affective, and behavioural features
what pcl-r score is psychopathic
30 or higher is a psychopath (However, 25+ may be sufficient to indicate that someone is a psychopath)