Lie Detector
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Institution:
Lie Detector
Introduction
The process of deception detection is invaluable in determining possible leads and judgment of inferences on crimes and necessities in regarding identities. It uses the questioning technique with aided technological equipment capable of recording physiological functions. They then ascertain the level of falsehood or detection of truthfulness in the responses by a suspected individual. Used by the law and enforcement authorities, the practice has been over the years while advancements and changes are enabled. The most widely and commonly used measure has been the polygraph, although communties that are untrained in aspects of countermeasures can be enabled in discrimination of above chance rates. In the latter’s case, it is usually below perfection. Computerized Voice Stress Analyzer functions to a percentage not considerable as sufficient in weighted financial investment.
Discussion
The Computerized Voice Stress Analyzer is a software program, which is designed to enable changes in measured forms of voice patterns, as caused by stress of an individual. In most cases, the stress is obtained from physical effort or mannerism used in hiding responses of deceptions when communicating (Adler, 2007). The equipment analyses any generated stress levels from a respondent’s talk and outputs a graph showing whether he or she is being deceptive or not. Computerized Voice Stress Analyzer is a form of control question technique, which is guided by the manner, physiological and administered analysis of the deliverables as means of detecting any form of deception.
On the primary function of Computerized Voice Stress Analyzer, the functionality is based on two criteria. The deceptive responses have to attain a uniform marking from the analysis of any stress-related measures while the non-deceptive are enabled with consistency of non-detection. In similar analysis of the polygraph, it is differential as it is limited to stress changers within the individual responding. On the other hand, the polygraph has detailed basis of respiration, response of galvanic skin and hear rate of the respondent. The measures of sensitivity are central to determination of the functionality of Computerized Voice Stress Analyzer (Steven, 2003). It therefore performs to inconclusive levels depending on the use of statistics obtained.
One of the major reasons why the Computerized Voice Stress Analyzer doers not offer conclusive evidence and analysis is the sensitivity and specificity rates. Sensitivity is percentage calculated on the deceptive measures through the VSA device and correctly termed so. On the other hand, specificity rate is the calculated percentage of non-deceptive measure classified by the machines as so. The machines have low sensitivity, as they cannot deter any form of deception. The smaller core sets of the field analysis presented by the Computerized Voice Stress Analyzer offers some assurance on the instances of deception despite the conclusive ability for affirmation. The basic relationship between regenerated speech, stress levels, and consequent deception cannot be easily distinguished and thus why criticism of the equipment is high.
Conclusion
Computerized
Voice Stress Analyzer functions to a percentage not considerable as sufficient
in weighted financial investment. The software program is designed to enable
changes in measured forms of voice patterns, as caused by stress of an
individual through the equipment. It uses sensitivity and specificity within generated
responses and alterations of stress levels. In turn, it draws outputs of a
graph, showing whether he or she is being deceptive or not by use of the
controlled question technique. However, distinction between regenerated speech,
stress levels, and consequent deception should be worked on.
References:
Alder, K. (2007). The lie detectors: The history of an American obsession. New York: Free Press.
Steven, F. (2003). The polygraph and lie detection. Washington D.C.: National Academies Press.