Document Detail

Thirty-site P300 scalp distribution, amplitude variance across sites, and amplitude in detection of deceptive concealment of multiple guilty items.
MedLine Citation:
PMID:  18633836     Owner:  NLM     Status:  MEDLINE    
Previous tests of P300 in deception detection have focused mainly on amplitude analysis. Since countermeasures for such tests have been reported, we looked here at other possible variables as deception indices: P300 scalp distribution and amplitude variance, both across 30 sites. We were also concerned, for the first time, in testing for recognition of more than one guilty item in a mock crime scenario. There were three groups: (1) two-probe group, two of six items were guilty knowledge (GK) items; (2) three-probe group, three of six items were GK items; (3) control group, zero of six items were GK items. In group analyses, in the two-probe group, P300s for lies were significantly greater than P300s for truthful responses. There were significant interactions of condition (Lie vs Truth) by site, suggesting different scalp profiles for deceptive versus truthful responding. Amplitude variance across sites was also greater in Lie than in Truth blocks. These results did not obtain in the three-probe and control groups. In terms of amplitude variances in probe conditions across groups, two-probe group was larger than three-probe and control groups. Regarding individual diagnostics, the variance method yielded a greater-than-chance detection rate of 71% versus 28% false positives. Regarding amplitude at multiple nonfrontal sites, 71% of guilty subjects were detected versus 14% false positives. Grier's (1971) A' indices of various test discrimination efficiencies varied from .76 to .87. Results of the present study suggested further investigation of the variance method as a diagnostic tool for lie detection.
Ming Ann Lui; J Peter Rosenfeld; Andrew H Ryan
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Social neuroscience     Volume:  4     ISSN:  1747-0927     ISO Abbreviation:  Soc Neurosci     Publication Date:  2009  
Date Detail:
Created Date:  2009-09-29     Completed Date:  2009-12-07     Revised Date:  2009-12-11    
Medline Journal Info:
Nlm Unique ID:  101279009     Medline TA:  Soc Neurosci     Country:  England    
Other Details:
Languages:  eng     Pagination:  491-509     Citation Subset:  IM    
Northwestern University, Evanston, IL 60208, USA.
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MeSH Terms
Crime / psychology
Event-Related Potentials, P300 / physiology*
False Positive Reactions
Lie Detection / psychology*
Photic Stimulation
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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