A partial list of peer-reviewed studies, government research, and academic publications supporting voice stress analysis technology.
A three-year study funded by the National Institute of Justice determined that voice stress analysis achieved an accuracy rate of 100% when used to detect stress in 45 known-conclusion responses.
Cestaro reports that lab simulations established the CVSA performs electrically according to the manufacturer's theory of operation, and that even in the absence of jeopardy, data indicates a systematic and predictable relationship between voice patterns and stress related to deception.
S/A Tippett examined 54 convicted sex offenders and found 100% agreement between the CVSA and polygraph results — 35 deceptive and 19 non-deceptive determinations. Concluded that the CVSA is as effective as polygraph.
Research suggests psychological stress may be detected as acoustic modifications in the fundamental frequency of a speaker's voice. Found that the 8–14 Hz modulation decreases as striated muscles contract in response to arousal, limiting natural trembling.
Selected 211 criminal responses at random from 2,109 known-conclusion responses. Confirmed voice stress analysis accuracy as a truth verification device with a confession rate of 94.8% where deception was indicated.
Presented to the American Association for the Advancement of Science. Reports that voice stress analysis does depict predictable and self-reported anxiety.
Concludes that voice stress analysis is a valid measure of anxiety.
Study indicated that voice stress analysis of verbal responses correlated well with other physiological responses to acute stress.
Independently verified the existence of the 8–14 Hz micro-tremor and traced its origins to the central nervous system. Published in Biology of Cybernetics.
Concluded that audio stress can be detected with a voice stress analyzer in psychiatric patients during therapy, and that the VSA could serve as a useful tool for this purpose.
Analyzed 91 known-conclusion criminal responses and determined that audio stress analysis is valid in detecting psycho-physiological changes, usable by trained examiners for truth and deception evaluation.
Utilizing a voice stress analyzer, established that the frequency of vocal stress increased as a function of audience size. Presented at the Eastern Psychological Association convention.
First discovery of the physiological tremor in the human voice in the 8–12 Hz range — the foundational science behind all modern voice stress analysis.
Early exploration of the correlation between rhythmical muscle unit activity during voluntary contraction and stress response.
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