Interview talks about how Layered Voice Analysis (LVA) can measure emotions, cognitive activity, and deception. It also highlights that LVA is used by hundreds of law enforcement professionals and works with any language. Note: Amir Liberman from Nemesysco is the inventor of Layered Voice Analysis. Lynn Robbins is a reseller. For more information on Layered Voice Analysis (LVA): www.layered-voice-analysis-info.com ◦
Sunday, January 3, 2010
Interview talks about how Layered Voice Analysis
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https://antipolygraph.org/blog/?tag=lva
Stress and Deception in Speech: Evaluating Layered Voice Analysis
Hot off the press in Journal of Forensic Sciences (hat tip Mind Hacks), a study in which a Layered Voice Analysis system was tested independently and found to be effective at the chance level. In other words, you might as well flip a coin.
Here’s the abstract:
This study was designed to evaluate commonly used voice stress analyzers—in this case the layered voice analysis (LVA) system. The research protocol involved the use of a speech database containing materials recorded while highly controlled deception and stress levels were systematically varied. Subjects were 24 each males/females (age range 18–63 years) drawn from a diverse population. All held strong views about some issue; they were required to make intense contradictory statements while believing that they would be heard/seen by peers. The LVA system was then evaluated by means of a double blind study using two types of examiners: a pair of scientists trained and certified by the manufacturer in the proper use of the system and two highly experienced LVA instructors provided by this same firm. The results showed that the “true positive” (or hit) rates for all examiners averaged near chance (42–56%) for all conditions, types of materials (e.g., stress vs. unstressed, truth vs. deception), and examiners (scientists vs. manufacturers). Most importantly, the false positive rate was very high, ranging from 40% to 65%. Sensitivity statistics confirmed that the LVA system operated at about chance levels in the detection of truth, deception, and the presence of high and low vocal stress states.
Reference:
* James D. Harnsberger, Harry Hollien, Camilo A. Martin, and Kevin A. Hollien (in press) Stress and Deception in Speech: Evaluating Layered Voice Analysis. Journal of Forensic Sciences
http://deception.crimepsychblog.com/?p=316
I also think that she doesn't really believe that she done it when it comes to lie detection. She says the door is open. In that moment she makes a right shoulder shruk en nods no (could be emphasizing). I'm curious what the others users think of that.
Interesting how voice analysis is used in other parts of the world:
http://www.alternet.org/story/130891/
I read and follow as many articles and research regarding LVA as possible. I've been using LVA now for almost 7 years, successfully I might add. The odd thing that time and time again are never mentioned in these articles and research is how the technology actually works. The said research above was done in a controlled environment, in fact the abstract states "while highly controlled deception and stress levels were systematically varied". Unfortunately the technology measures the Phcycologal jump of the brain from Homeostasis to the Para Sympathetic state. Something that will not happen if you pre arrange your answers.
There is alot more to Layered Voice Analysis than what this article gives it credit.
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