Mock crime application of the Complex Trial Protocol (CTP) P300-based concealed information test

2011 ◽  
Vol 48 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Michael R. Winograd ◽  
J. Peter Rosenfeld
Keyword(s):  
Trial Protocol ◽  
Concealed Information Test ◽  
Mock Crime ◽  
Concealed Information ◽  
Information Test

scholarly journals The first independent study on the complex trial protocol version of the P300-based concealed information test: Corroboration of previous findings and highlights on vulnerabilities

2019 ◽  
Author(s):  
Gáspár Lukács ◽  
Huszár Katalin ◽  
Vera Daniella Dalos ◽  
Tünde Kilencz ◽  
Szabina Tudja ◽  
...  
Keyword(s):  
High Accuracy ◽  
Independent Study ◽  
Trial Protocol ◽  
Concealed Information Test ◽  
Probe Item ◽  
Irrelevant Item ◽  
Concealed Information ◽  
Practical Implications ◽  
Information Test

More than a dozen studies of the Complex Trial Protocol (CTP) version of the P300-based Concealed Information Test have been published since its introduction (Rosenfeld et al., 2008), and it has been fairly consistently proven to provide high accuracy and strong resistance to countermeasures (Rosenfeld et al., 2013). However, no independent authors have verified these findings until now. In the present, first independent study, we corroborate the accuracy and countermeasure-resistance of the CTP, when the probe item (critical presented information, e.g., crime detail; P) vs. all irrelevant items (Iall) comparison is used for classifying participants as guilty or innocent, but we also show that the CTP is severely vulnerable to countermeasures, when the P vs. the irrelevant item with the largest P300 responses (Imax) comparison is used. This latter measure can be defeated by creating “oddball” items among the irrelevant items (through targeting them with covert responses), and thereby making their P300 responses statistically indistinguishable from those of the probe item. Practical implications are discussed.

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