Two small metal plates, attached to the fingers, will record sweat gland activity, and A blood pressure cuff, or similar device will record cardiovascular activity. During this period, the examiner will discuss the questions to be asked and familiarize the examinee with the testing procedure. Following this, the examiner will analyse the charts and render an opinion as to the truthfulness of the person taking the test. The examiner, when appropriate, will offer the examinee an opportunity to explain physiological responses in relation to one or more questions asked during the test. In other words a voice stress test is not a polygraph test.
Every human being is endowed with an autonomous nervous system.
As the name implies, this system is autonomous and it is not possible to override it. The reactions are listed above and are physiological and thus measurable. The parasympathetic system, a part of the sympathetic system, acts to normalise the body as soon as possible, i.e. to restore the normal balance in order ensure homeostasis.