Lying

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A lie (also called prevarication, falsehood) is a type of deception in the form of an untruthful statement, especially with the intention to deceive others, often with the further intention to maintain a secret or reputation, protect someone's feelings or to avoid a punishment or repercussion for one's actions. To lie is to state something that one knows to be false or that one does not honestly believe to be true with the intention that a person will take it for the truth. A liar is a person who is lying, who has previously lied, or who tends by nature to lie repeatedly - even when not necessary.

Lying is typically used to refer to deceptions in oral or written communication. Other forms of deception, such as disguises or forgeries, are generally not considered lies, though the underlying intent may be the same. However, even a true statement can be used to deceive. In this situation, it is the intent of being overall untruthful rather than the truthfulness of any individual statement that is considered the lie.

Psychology of lying

The capacity to lie is noted early and nearly universally in human development. Social psychology and developmental psychology are concerned with the theory of mind, which people employ to simulate another's reaction to their story and determine if a lie will be believable. The most commonly cited milestone, what is known as Machiavellian intelligence, is at the age of about four and a half years, when children begin to be able to lie convincingly. Before this, they seem simply unable to comprehend why others don't see the same view of events that they do — and seem to assume that there is only one point of view, which is their own.

Young children learn from experience that stating an untruth can avoid punishment for misdeeds, before they develop the theory of mind necessary to understand why it works. In this stage of development, children will sometimes tell outrageous and unbelievable lies, because they lack the conceptual framework to judge whether a statement is believable, or even to understand the concept of believability.

When children first learn how lying works, they lack the moral understanding of when to refrain from doing it. It takes years of watching people tell lies, and the results of these lies, to develop a proper understanding. Propensity to lie varies greatly between children, some doing so habitually and others being habitually honest. Habits in this regard are likely to change in early adulthood.

Those with Parkinson's disease show difficulties in deceiving others, difficulties that link to prefrontal hypometabolism. This suggests a link between the capacity for dishonesty and integrity of prefrontal functioning.

Pseudologia fantastica is a term applied by psychiatrists to the behaviour of habitual or compulsive lying.

Mythomania is the condition where there is an excessive or abnormal propensity for lying and exaggerating.

A recent study found that lying takes longer than telling the truth. Or, as Chief Joseph succinctly put it, "It does not require many words to speak the truth."

http://en.wikipedia.org/wiki/Lie

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