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The vision in "blind" justice: expert perception, judgment, and visual cognition in forensic pattern recognition
1Institute of Cognitive Neuroscience, University College London, London, England. i.dror@ucl.ac.uk
Psychonomic Bulletin & Review
|April 13, 2010
Summary
Forensic expert pattern matching is subjective and can be influenced by external factors, leading to potentially contradictory decisions even when examining identical evidence. Understanding these influences is crucial for improving forensic science reliability.
Area of Science:
- Forensic Science
- Cognitive Psychology
- Decision Making
Background:
- Forensic disciplines rely on expert judgment of pattern similarity to determine origin.
- Perception and judgment in pattern matching are known to be subjective and influenced by various factors.
- Previous studies indicate that context can alter expert examiner decisions on the same evidence.
Purpose of the Study:
- To investigate factors affecting expert judgment in forensic pattern matching.
- To understand the subjectivity and susceptibility of forensic decisions to external influences.
- To explore variability in examiner susceptibility to contextual influences.
Main Methods:
- Analysis of factors influencing expert perception and judgment in pattern matching.
- Examination of how context, emotion, expectation, and motivation affect forensic decisions.
- Observation of expert examiners under varying conditions, including unawareness of study participation.
Main Results:
- Forensic expert decisions can be subjective and influenced by external factors like context and motivation.
- The same expert may reach contradictory conclusions on identical patterns presented in different contexts.
- Examiner susceptibility to these influences varies, particularly in difficult "hard to call" cases.
Conclusions:
- Expert pattern matching in forensics is not always objective and can be swayed by non-scientific factors.
- Understanding these cognitive biases is essential for enhancing the reliability and validity of forensic science.
- Further study of forensic examiners offers insights into expertise and decision-making processes.
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