Pathological Lying
Thus, lies are of different degrees and are told for various purposes and with differing frequencies. What, then, amounts to "pathological" lying, and what distinguishes the pathological liar from the person who just lies a lot? Dike and colleagues1 suggest that the diagnosis is made when the lying is persistent, pervasive, disproportionate, and not motivated primarily by reward or other external factors. They also suggest, however, that a key characteristic of pathological lying may be its compulsive nature, with pathological liars "unable to control their lying," although another term they use is "impulsive." In addition, they refer to other accounts that speculate on whether the pathological liar may be unaware that he is lying, although they point to evidence showing that, when challenged, the pathological liar admits to at least a partial recognition of his or her lies (which assumes, of course, that pathological liars can be accurately identified so this can be tested in the absence of a clear definition or operational criteria). Clearly, to be a pathological liar, an individual must lie on more than a few occasions, but how frequent does the behavior have to be? Is the scale of the lie really important, or does this just make the pathological liar easier to spot? And why is it relevant that the lies seem pointless? From a psychiatric point of view, lying is simply a type of behavior, albeit a complex one, that demands an appreciation of the abstract concept of truth. What makes a behavior psychiatrically abnormal is not its degree or its purpose, but the extent to which the individual has power over it. The fact that a behavior may cause the individual more harm than good and that there does not seem to be a rational reason for it may be indicators of psychiatric morbidity, but neither is necessary or sufficient to establish a disorder. What these indicators suggest, however, is an apparent lack of control. For pathological lying to exist, therefore, the individual must lie despite himself, just as someone with an anxiety disorder cannot help feeling anxious.
If this formulation is right, then there are no pathological lies, only pathological liars. And whether or not this is primary or secondary to another condition, it suggests a disorder that is either compulsive in nature or something akin to an impulse control disorder. Although if it is true that some or all pathological liars are in fact unaware of their lies, something more fundamentally organic seems likely. Without evidence of compulsivity, excessive impulsivity, or brain dysfunction, habitual lying, no matter how grand, is not a symptom, syndrome, or diagnosis, but just plain lying.
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I was just reading through this and I found it pretty interesting. Do you think there really are pathological liars? Do you believe it's really possible that someone can have no control over their own lying?

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