From Wikipedia on 10-Nov-2012
Deception, beguilement, deceit, bluff, mystification and subterfuge are acts to propagate beliefs that are not true, or not the whole truth (as in half-truths or omission). Deception can involve dissimulation, propaganda, and sleight of hand, and well as distraction, camouflage or concealment. There is also self-deception, as in bad faith.
Deception is a major relational transgression that often leads to feelings of betrayal and distrust between relational partners. Deception violates relational rules and is considered to be a negative violation of expectations. Most people expect friends, relational partners, and even strangers to be truthful most of the time. If people expected most conversations to be untruthful, talking and communicating with others would require distraction and misdirection to acquire reliable information. A significant amount of deception occurs between romantic and relational partners.
Deception includes several types of communications or omissions that serve to distort or omit the complete truth. Deception itself is intentionally managing verbal and/or nonverbal messages so that the message receiver will believe in a way that the message sender knows is false. Intent is critical with regard to deception. Intent differentiates between deception and an honest mistake. The Interpersonal Deception Theory explores the interrelation between communicative context and sender and receiver cognitions and behaviors in deceptive exchanges.
The five primary forms of deception are:
1. Lies: making up information or giving information that is the opposite or very different from the truth.
2. Equivocations: making an indirect, ambiguous, or contradictory statement.
3. Concealments: omitting information that is important or relevant to the given context, or engaging in behavior that helps hide relevant information.
4. Exaggerations: overstatement or stretching the truth to a degree.
5. Understatements: minimization or downplaying aspects of the truth.
There are three primary motivations for deceptions in close relationships.
Partner-focused motives: using deception to avoid hurting the partner, to help the partner to enhance or maintain his/her self-esteem, to avoid worrying the partner, and to protect the partner’s relationship with a third party. Partner-motivated deception can sometimes be viewed as socially polite and relationally beneficial.
Self-focused motives: using deception to enhance or protect their self-image, wanting to shield themselves from anger, embarrassment, or criticism. Self-focused deception is generally perceived as a more serious transgression than partner-focused deception because the deceiver is acting for selfish reasons rather than for the good of the relationship.
Relationship-focused motives: using deception to limit relationship harm by avoiding conflict or relational trauma. Relationally motivated deception can be beneficial to a relationship, and other times it can be harmful by further complicating matters.
Detection
Deception detection between relational partners is extremely difficult, unless a partner tells a blatant or obvious lie or contradicts something the other partner knows to be true. While it is difficult to deceive a partner over a long period of time, deception often occurs in day-to-day conversations between relational partners. Detecting deception is difficult because there are no known completely reliable indicators of deception. Deception, however, places a significant cognitive load on the deceiver. He or she must recall previous statements so that his or her story remains consistent and believable. As a result, deceivers often leak important information both verbally and nonverbally.
Deception and its detection is a complex, fluid, and cognitive process that is based on the context of the message exchange. The Interpersonal Deception Theory posits that interpersonal deception is a dynamic, iterative process of mutual influence between a sender, who manipulates information to depart from the truth, and a receiver, who attempts to establish the validity of the message. A deceiver’s actions are interrelated to the message receiver’s actions. It is during this exchange that the deceiver will reveal verbal and nonverbal information about deceit. Some research has found that there are some cues that may be correlated with deceptive communication, but scholars frequently disagree about the effectiveness of many of these cues to serve as reliable indicators. Noted deception scholar Aldert Vrij even states that there is no nonverbal behavior that is uniquely associated with deception. As previously stated, a specific behavioral indicator of deception does not exist. There are, however, some nonverbal behaviors that have been found to be correlated with deception. Vrij found that examining a “cluster” of these cues was a significantly more reliable indicator of deception than examining a single cue.
Truth Bias
The truth bias significantly impairs the ability of relational partners to detect deception. In term of deception, a truth bias reflects a tendency to judge more messages as truths than lies, independent of their actual veracity. When judging message veracity, the truth bias contributes to an overestimate of the actual number of truths relative to the base rate of actual truths. The truth bias is especially strong within close relationships. People are highly inclined to trust the communications of others and are unlikely to question the relational partner unless faced with a major deviation of behavior that forces a reevaluation. When attempting to detect deceit from a familiar person or relational partner, a large amount of information about the partner is brought to mind. This information essentially overwhelms the receiver’s cognitive ability to detect and process any cues to deception. It is somewhat easier to detect deception in strangers, when less information about that person is brought to mind.