KishKish VSA™ The Voice Games

About Voice Stress Analysis

Voice Stress Analysis (VSA) is a type of KishKish lie detector which measures stress in a person's voice. The use of Voice Stress Analysis (VSA) as a lie detector became popular in the late 1970s and 80s. In the 90s the first Computerized VSA (CVSA) systems came to out to the market.

Now KishKish SAM offers you a tool to detect the lies you hear on your phone. With the use of KishKish SAM VSA you can monitor whole conversation and see the stress level of the person you talked with. Just keep a record of all your phone calls and monitor them for lies or high stress levels.

The Voice Analysis group includes a:
* Horizontal momentary stress level bar
* A stress level graph of the whole audio file


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You can jump to the "interesting" (high stress) section by clicking the VSA graph.
Then listen closely and look at the "Stress Level".

How it works

First thing is to start getting used to record all your call.
Just set KishKish SAM on automatic recording and you can opt-out on all the notifications to disable the audio and text notification.

Then just playback the recorded audio conversation and you will see that persons Stress Levels in the Voice Analysis window.

The Kish Kish  Software VSA engine analyses the full audio file. It will work well when a single talker is recorded, so you should use stereo file format recording. If set to Mono, VSA will not be activated. The VSA engine will not be activated when a conference call is record, since more then one talker will be saved in that audio channel.


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The Theory
Researchers found that frequencies in the human voice are sensitive to honesty. When a person is being honest the average sound in that range is generally in the lower frequencies, but is usually higher in dishonest situations.

All muscles in the body, including the vocal chords, vibrate. 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 readiness of its muscles to spring into action. Their vibration increases from the relaxed lower frequencies.

Such vibrations are a measure of stress, levels of which change from moment to moment. Everybody knows that stress, also known as anxiety or being up-tight, can be brought on by a simple thought or memory; of a loved one's passing on, for example, or suddenly remembering some dangerous obstacle in the future. Some people have high average stress levels, and some have low, and averages changes from day to day along with mood. What all people have in common is that their stress levels are constantly changing within their current range, changes which indicate the "perceived jeopardy" or "danger" of statements being made. A lie is often dangerous, humiliating, or injurious to get caught at, so lies tend to stand out on stress measurements.