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Reading the famous quote of Oliver Sacks, can we draw conclusions about liars?

"We speak not only to tell other people what we think, but to tell ourselves what we think. Speech is a part of thought." [Oliver Sacks]

If speech is part of thought, then maybe liars can begin making fallacious thoughts in the long run?

Is there scientific evidence that links self-speech with thinking, possibly in relation to (pathological) liars?

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I have seen this, but it's anecdotal observations. It may be that those who do not lie to themselves are more ina sociopathic direction, since they exercise a kind of malice. 'Plain liars' are, in a way, innocent of that kind of connivery. Also, welcome to CogSci.SE – New Alexandria Sep 13 '13 at 12:59
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Warren Buffett, the master investor opined, "the CEO who lies to others in public will eventually start lying to himself in private." If a behavior becomes too ingrained, it becomes hard to control. – Tom Au Sep 13 '13 at 21:01
    
@NewAlexandria- I wish you could elaborate your thesis. – Ramit Sep 14 '13 at 15:54
    
This question, due to the way it's phrased, is primarily opinion-based. If you were to reduce it to clinical terms, like whether self-deception is common in pathological liars, it would be acceptable. – Seanny123 Jun 8 at 21:05
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Words and grammar comprise a framework for categorising thoughts, or in other words relating current thoughts to previous thoughts and understandings of self and others. When we put our thoughts into words, we encode those thoughts into a more memorable and transferable format. By speaking in falsehoods, a liar may be better able to remember those falsehoods, but this does not mean the liar believes them more. A fiction storyteller also puts falsehoods into words but knows reality from fiction. I postulate that an accurate answer depends on a particular liar's reason for lying. – Michael Jun 14 at 2:59

Although I cannot answer the question on lying, (self-)speech and thinking are intimately linked to each-other, and actually used in UX-design (e.g. Krahmer, 2004). He compared two different approaches of thinking-aloud. In other words, people are perfectly able to verbalize their thoughts and actually do so.

One of the approaches he compares is a proposal of Ericsson and Simon (1993). In their nice and brief paper, they discuss (and refer to) many scientific papers (e.g. cognitive scientific and psychological) where self-speech is used during problem solving. Moreover, it showed that self-speech is related to other variables that correspond to thoughts.

In their review, Ericsson and Simon (1993) found that longer RTs were associated with verbal reports of a larger number of intermediate thoughts than those corresponding to shorter RTs. Furthermore, there seemed to be close correspondence between subjects’ thoughts and what information that they looked at--when subjects verbalized thoughts about objects in the environment they very frequently looked at them.

I must admit that self-speech in this way is only used as a methods of identifying cognitive processes, and is often a mandated task in the experiment. However, the fact that people are able to reflect on their thoughts, gives me reason to believe that they can do so unconsciously too. If someone could correct me or confirm this, I invite you to do so.

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