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Item Roles Explored in a Modified P300-Based CTP Concealed Information Test.
Gáspár Lukács1, Alicja Grządziel2,3, Marleen Kempkes2
1Department of Basic Psychological Research and Research Methods, Faculty of Psychology, University of Vienna, Liebiggasse 5, A-1010, Vienna, Austria. gaspar.lukacs@univie.ac.at.
Applied Psychophysiology and Biofeedback
|April 11, 2019
Summary
Familiarity-related inducer items did not improve the P300-based Concealed Information Test (CIT) efficiency. However, the CIT effect was stronger for personally important items, suggesting saliency influences detection accuracy.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Forensic Psychology
Background:
- The Concealed Information Test (CIT) is a method to detect concealed knowledge.
- P300 event-related potentials are used in CIT to measure recognition of critical stimuli.
- Enhancing CIT accuracy is crucial for reliable deception detection.
Purpose of the Study:
- To investigate the impact of familiarity-related inducer items on the P300-based CIT.
- To examine how item personal importance influences CIT performance.
Main Methods:
- The Complex Trial Protocol of the P300-based CIT was employed.
- Familiarity-related inducer items (e.g., "mine," "other") were introduced.
- Participants were presented with items of varying personal importance (forenames, birthdays, favorite animals).
Main Results:
- Inclusion of inducers did not significantly enhance overall CIT efficiency.
- Visual similarity between inducers and stimuli may have caused a distracting effect.
- The CIT effect (P300 difference between probe and irrelevant stimuli) was positively correlated with item personal importance.
Conclusions:
- Familiarity-related inducers may not be effective in improving P300-based CIT accuracy.
- Subjective saliency and personal importance of items significantly modulate the CIT effect.
- Future research should consider the impact of item characteristics on deception detection accuracy.
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