The type of eye contact variation appears to be different depending on the nature of the deceiver. Introverted liars show a dramatic decrease in eye contact, while extroverted deceivers show an increase in eye contact (Walters, 1996). It is possible that the introverts response is a "flight" reaction attempting to disassociate themselves from the stress of the deceptive situation, while the extraverts bolstered their interpersonal presence via increased eye contact as a "fight" reaction either to challenge the interrogator or because they believed it increased their perceived sincerity.
A less salient and more complicated, yet still predictive, cluster of deception cue behavior are the signals provided by posture and body movements. Horvath, Jayne, and Buckley (1993) created a profile of postural and body movement variations of truth-tellers and deceptive individuals. According to their findings an honest individual typically displays a comfortable, open, and forward leaning posture. The deceptive individual is characterized by a more rigid, generally frozen, and defensive posture.
The rigid and frozen nature of postural shifts and body movements is a consistent finding (Mehrabian, 1971; Vrij, 1994).
It does appear that the deceptive communicator will occasionally show evidence of increased movements. One particular example occurs when an individual is attempting to disguise a channel that they consider more revealing (Ekman & Friesen, 1974). Walters (1996) notes that some of the more common disguising movements include: the covering of ones mouth, or even briefly ones face, to disguise any revealing facial expressions; and secondly the breaking of eye contact during times of particular stress via the usage of an interfering body movement (i.e., adjusting ones glasses).
The typical deceiver also tends to present a posture defined by researchers as "defensive" (Horvath, Jayne, & Buckley, 1993). Typical of this posture is the backward lean, arm crossing, and leg crossing. When an individual is feeling threatened and stress increases, it appears that one often carries out a postural shift into a "defensive" position that acts as a proximal barrier for the individual. This in turn creates a more comfortable, and thereby less stressful, environment.