Forensic Voice Stress Analyzer (FVSA)
The FVSA© measures all spoken frequencies, Audible and Inaudible. The human voice is produced by a combination of the Lungs, Vocal Folds and Articulators. When a person is being deceptive over a question that has a consequence, the vocal folds constrict subconsciously and alter the frequency of uttered sound. This automatic physiological reaction of the Vagus Nerve areas culminating in a vocal frequency change but affecting more than a dozen parts of the body cannot be consciously controlled and is not necessarily audible. This causes the pattern captured on screen by the FVSA © to dramatically change from Diagonal to Horizontal, thereby simplifying the analysis of the test.
























