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The P300-Based, Complex Trial Protocol for Concealed Information Detection Resists Any Number of Sequential Countermeasures Against Up to Five Irrelevant Stimuli.
MedLine Citation:
PMID:  21965119     Owner:  NLM     Status:  Publisher    
We previously tested the P300-based Complex Trial protocol for deception detection against 2 and 4 countered of 4 irrelevant stimuli. The protocol detected 90-100% of these subjects with <10% false positives. We have also shown that Reaction Time (RT) to the first trial stimulus is increased (group effect) with countermeasure use. We also reported a new P900 component associated with countermeasure use when 2 of 4 irrelevants are countered. In the present study we report data from 4 new groups and re-present for comparison previously collected data to have 7 groups: an innocent control, a guilty group not using countermeasures, and 5 guilty/countermeasure groups who counter from 1 to all 5 stimuli presented (4 irrelevants plus a probe). Subjects were detected at rates varying from 92 to 100% in the 6 guilty groups (n = 12 or 13 per group). There was 1 false positive in 13 innocent subjects. Additionally, 41 of 60 CM users were identified with RT as using countermeasures. P900 appeared in the 2 groups using 2 and 3 countermeasures.
Elena Labkovsky; J Peter Rosenfeld
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-1
Journal Detail:
Title:  Applied psychophysiology and biofeedback     Volume:  -     ISSN:  1573-3270     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9712383     Medline TA:  Appl Psychophysiol Biofeedback     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Psychology, Northwestern University, Evanston, IL, USA.
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