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NCJRS Abstract

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NCJ Number: 193832 Add to Shopping cart Find in a Library
Title: Investigation and Evaluation of Voice Stress Analysis Technology, Final Report
Author(s): Darren Haddad; Roy Ratley; Sharon Walter; Megan Smith
Date Published: February 2002
Page Count: 119
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
National Institute of Justice/NCJRS
Rockville, MD 20849
NCJRS Photocopy Services
Rockville, MD 20849-6000
Grant Number: 98-LB-VX-A013
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF
Type: Report (Study/Research) ; Test/Measurement
Format: Document
Language: English
Country: United States of America
Annotation: This report presents the methodology and results of the testing and evaluation of two voice stress analysis (VSA) systems that their vendors claim can detect stress, possibly indicating deception, in voice communications.
Abstract: The VSA systems are advertised as being less expensive, easier to use, less invasive in use, and less constrained in their operation than polygraph technology. In response to inquiries by law enforcement officials about this technology, this testing and evaluation was conducted by the Air Force Research Laboratory. The evaluation was conducted in three phases. In the first phase, Dr. John H.L. Hansen investigated the feasibility of detecting stress from speech. He reports on the methods, analysis, and classification of voice stress in an appendix of this report. The second and third phases of this study investigated the reliability of two commercial VSA units (the Vericator and the Diogenes Lantern) from a theoretical perspective and an application (i.e., law enforcement) perspective. The evaluation concludes that the two VSA units do recognize stress through voice analysis; however, although these systems state they detect deception, this was not proven. This study does show, from a number of speech-under-stress studies, that linear and nonlinear features are useful for stress classification. Due to the lack of deceptive stress data available, classification of deceptive stress versus emotional stress or physical stress could not be tested. It still needs to be proven whether or not these VSA systems differentiate between the different types of stress. Suggestions are offered for future research. 4 figures and 14 references
Main Term(s): Police equipment
Index Term(s): Behavior under stress; Instrument validation; Investigative techniques; NIJ final report; Stress assessment; Voice communications
Note: Dataset may be archived by the NIJ Data Resources Program at the National Archive of Criminal Justice Data
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