Stress can impact someone in many ways. We are all familiar with neck tension, nervousness and other physical attributes of stress, but have you considered how your voice reacts?
In both principle and execution VSA is a simple technology. Researchers found that frequencies in the human voice in the 8 to 12 Hz range are sensitive to honesty. When a person is being honest the average sound in that range is generally below 10 Hz, but is usually above 10 Hz in dishonest situations.