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Detection of Guilty Knowledge with Event-Related Potentials
Journal of Applied Psychology
  • Timothy L Boaz, University of South Florida
  • Nathan W Perry, University of Florida
  • Gary Raney, University of Florida
  • Ira S Fischler, University of Florida
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The N400 component of the event-related potential (ERP) is elicited by words that complete sentences falsely. The utility of the N400 in discriminating subjects who have knowledge about a crime from those who do not was examined in this study. Subjects viewed a videotape of either an enacted burglary (guilty condition) or scenes from the city of New York (innocent condition). They then read crime-relevant phrases that had true or false completions but were not required to make any overt response as to the statements' truth. Post hoc analyses indicated that 78% of subjects could be correctly classified as guilty or innocent. Applying the same classifier to two other samples resulted in a correct classification rate of 73.2%. With further development, ERPs may become useful auxiliaries to current lie-detection techniques.

Citation / Publisher Attribution

Journal of Applied Psychology, v. 76, issue 6, p. 788-795

Citation Information
Timothy L Boaz, Nathan W Perry, Gary Raney and Ira S Fischler. "Detection of Guilty Knowledge with Event-Related Potentials" Journal of Applied Psychology Vol. 76 (1991) p. 788 - 795
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