". . . Step 1: Unusual Ahem's Alert
Although clearing one's throat is not necessarily considered aberrant behavior, it is not a normal everyday feature of the average person's speech. A healthy liar is more likely to do the "ahem" sound than a healthy non-liar. Psychological stress on a typical liar tends to put some tension on their muscular system, which includes their vocal muscles. The vocal muscles are miniscule in size, about the size of a thumbnail.1 The air you breathe passes through the vocal muscles on their way to the lungs and vice-versa. When the vocal muscles contract, they temporarily halt the respiration process; hence, the tensed liar may need to clear their throat in order to continue speaking.
Step 2: Creaky Voice Alert
Another common after-effect of lying and the anxiety associated with it on the vocal system is a creaky tone or a glottal fry.1 It is called so, because the voice then sounds as if it is being fried. The vocal chords try to minimize the impact of the lack of air by conserving it, resulting in a creaky voice. A physically healthy nervous liar is more likely than a relaxed physically healthy honest person to speak with a creaky voice.
Step 3: Judge in Context
While the typical liar's vocal features described in the previous steps can be a warning sign, they are to be analyzed within the proper context. There are many causes of the creaky voice and clearing of throat, and the anxiety that accompanies the act of lying is just one of them. Sickly honest people can just as easily experience these vocal problems as healthy dishonest people. In addition, there are experienced liars and pathological liars that are so used to lying that they have become immune to the anxiety that haunts the average liar. Therefore, the two vocal hot spots described in this page are meant to be used with an open mind. . . "
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