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Mock crime application of the Complex Trial Protocol (CTP) P300-based concealed information test
Michael R Winograd1, J Peter Rosenfeld1
1Department of Psychology, Northwestern University, Evanston, Illinois.
Psychophysiology
|June 19, 2010
Summary
The Complex Trial Protocol (CTP) accurately detected concealed information, even with countermeasures. This P300-based concealed information test (CIT) shows high effectiveness in mock crime scenarios.
Area of Science:
- Cognitive Psychology
- Forensic Psychology
- Neuroscience
Background:
- Previous P300-based concealed information tests (CITs) using a "three stimulus" paradigm showed limitations.
- The Complex Trial Protocol (CTP) demonstrated improved accuracy and countermeasure (CM) resistance with autobiographical data.
Purpose of the Study:
- To evaluate the Complex Trial Protocol (CTP) for detecting incidentally acquired information in a mock crime setting.
- To enhance ecological validity by ensuring guilty knowledge was acquired during the mock crime event.
Main Methods:
- Application of the Complex Trial Protocol (CTP) in a mock crime scenario.
- Inclusion of guilty, innocent, and countermeasure (CM) conditions.
- Measurement of reaction times (RTs) to index CM use.
Main Results:
- Overall correct classification rate of 92% across all conditions.
- Demonstrated effectiveness of the CTP in detecting incidentally acquired guilty knowledge.
- Reaction times (RTs) were used to identify countermeasure usage.
Conclusions:
- The Complex Trial Protocol (CTP) is a highly accurate and countermeasure-resistant method for detecting concealed information.
- The CTP is effective in mock crime scenarios involving incidentally acquired knowledge.
- This study supports the CTP's utility in real-world forensic applications.
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