Research and Recent Studies on the Science of Voice Stress Analysis

While the Computer Voice Stress Analyzer (CVSA®) is often considered an emerging technology, this cutting-edge truth verification system has been established as an important investigative tool by law enforcement for a long time now. From the discovery of how voices change in relation to stress in the 1970’s to today’s studies on the computerized technologies that enhance the system’s capabilities, many in the scientific community have been intrigued by the capabilities of the CVSA and the hidden messages in the human voice. With this in mind, we will endeavor to make the studies that underpin the scientific validity of the CVSA available and easy-to-understand so all CVSA practitioners will have a better understanding of the complex road the CVSA has travelled, from its humble beginnings to its domination of the truth verification market today.

Scientific Studies on the CVSA®

Shadows into Light: The Investigative Utility of Voice Analysis with Two Types of Online Child-Sex Predators

Over 390,000 child sexual abuse victims in the United States have not yet been identified. Due to the increased prevalence of Internet driven child-sex offenders (e.g., child pornographers and travelers), detection becomes more elusive, and disclosure elicitations are more challenging for law enforcement…

Scientific Study Summary: Cistaro, Victor, Ph. D. “A Comparison Between Decision Accuracy Rates Obtained Using Polygraph and the Computer Voice Stress Analyzer in the Absence of Jeopardy.” The Department of Defense – Polygraph Institute, Aug. 1995.

How Did the Department of Defense Verify the Theory Behind Voice Stress Analysis? In 1995, a new type of truth verification technology was making its mark in the law enforcement community: the Computer Voice Stress Analyzer (CVSA®). First introduced by the National...

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Scientific Study Summary: Eden, G. and Inbar, G.F. “Psychological Stress Evaluators: EMG Correlation with Voice Tremor.” Department of Electrical Engineering Technion, Israel Institute of Technology, Haifa, Israel. 1976

How Did EMG Experiments Lead to Contemporary Voice Stress Tests? Over the course of about a decade, J. Gary Eden and Gideon F. Inbar—two researchers in the Department of Electrical Engineering Technology at the Israel Institute of Technology—conducted multiple studies...

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