Analysis of information sources in references of the Wikipedia article "Voice stress analysis" in English language version.
[A] variety of factors could influence the presence or absence of the [voice pitch] microtremors, which are claimed to exist in our muscle control during speech production. It is clearly unlikely that a single measure such as that based on the computerized voice stress analyzer could be universally successful in assessing stress...it is not possible to cleanly separate the excitation signal into components due to emotion and those due to deception...a suspect under questioning would also display natural stress even if he were not guilty.
