Hall and Player Flashcards
What is the key background research to Hall and Player?
Dror and cognitive biases
What is the aim of Hall and Player?
to test if context had an effect on fingerprint identification by fingerprint experts
What is the method?
lab experiment - BUT designed to be as naturalistic as possible
What makes this study naturalistic?
- happened during work hours
- typical fingerprint examination room
What is the IV?
whether the participant was allocated the low context or high context
What are the three DVs?
- reading the examination report prior to analysis
- a match, not a match, or insufficient
- confidence
What is the sampling method?
volunteer
What is the sample?
70 fingerprint experts working for Metropolitan Police
evaluate the sample (+ technique)
strengths:
- low chance of attrition
- relatively large = more representative = more generalisable = population validity
weaknesses:
- only a certain type of person volunteers = less representative = less generalisable = lack population validity
What was the amount of participants per condition?
35 in each
What were the materials for this study?
- a finger impression from a known source superimposed on a scanned image of a £50 note
- obscured ridge detail
- fingerprint magnifying glass
- Russell comparator
What is the procedure?
- randomly assigned and asked to treat as a normal day
- low context scenario:
forgery - high context scenario:
murder - envelope given with examiners report - feedback sheet
What are the results?
- 81.4% read the crime scene examination before the analysis
- 52% in high context felt affected by report
- 6% in low context felt affected by report
What are the conclusions?
there is a relationship between the type of context and the perceived effect on the experts
evaluate according to ethics
- confidentiality upheld
- always a reasecher present with participants = PFH
- highly ethical!!
