We get this question quite a lot as most people are familiar with Polygraph test due to its exposure on the television and very few programs feature VSA test as it is a relatively new technology and not as visual as Polygraph.
For this purpose the producers of programs and movies make use of old analog polygraph machines (needles & ink systems) for their display purposes.
Basically the VSA test comprises the measurement of the flexibility of the vocal cords. As one start to stress and enter into the “fight, flight or freeze (FOF)” mode, the body undergoes several changes to cope with the danger at hand. One of these changes is the body reduce blood to the extremities and utilize it in the major muscle groups located mainly in the upper body. This causes the muscles in the throat to tighten and the basic frequency of the voice changes.
In the late 40’s Dr. Olof Lippold from the University College in London discovered all humans had a base frequency of between 8 to 12 hertz when in a normal state.
As he put it in his report named PHYSIOLOGICAL TREMOR, “A slight oscillation at approximately 10 cycles per second accompanies the normal contraction of voluntary muscles. It appears to be caused by a “hunting” mechanism in the reflex that controls the muscle”
Once we enter into the FOF syndrome, this basic frequency is diminished and is significantly less.
You can read more about VSA or DVSA (Digital Voice Stress Analysis) at Dr. Gary Baker’s website.
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