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How Voice Stress Analysis Works:
"All muscles in the body, including the vocal chords,
vibrate in the 8 to 12 Hz range. This is considered a
feedback loop, similar to a thermostat/heater that will
maintain an average temperature by raising the temperature a
little above the setting, switch off, and not come back on
until the temp is a little below it. Just as the temperature
swings up and down over time, so too do the muscles tighten
and loosen as they seek to maintain a constant tension. This
is known to be caused by the production and release of a
chemical, as explained in the Scientific American Article
"Psychological Tremor" Vol. 224, No. 3, 1971. In moments of
stress, like when you tell a lie that you dare not get
caught at, the body prepares for fight or flight by
increasing the readyness of its muscles to spring into
action. Their vibration increases from the relaxed 8 to 9
Hz, to the stressful 11 to 12 Hz range."
By Paul Dennis, from The Voice Stress
Analysis web site. View his site here.
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