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Why We Lie by David Livingstone Smith, 2004.
Page 76:
Self-deception helps us ensnare others more efficiently. It enables us to lie sincerely, to lie without knowing that we are lying. There is no longer any need to put on an act, to pretend that we are telling the truth. A self-deceived person is actually telling the truth to the best of his or her knowledge. Believing one's own story makes it all the more persuasive.
Although there have probably always been unconscious mental states, the capacity for self-deceptive thoughts led our ancestor to actively and intentionally, albeit unconsciously, keep certain thoughts out of the spotlight of conscious awareness. A portion of the mind became specialized for generating and nurturing falsehoods maintained side-by-side with an unconscious grasp of reality. The capacity for language must have vastly enhanced the capacity for self-deception. Language allowed us to lie (in the narrow sense of the word) to others and to whisper self-serving falsehoods to ourselves. A portion of the brain developed special expertise in dishonesty, cleverly weaving useful illusions out of biased perceptions, tendentious memories, and fallacious logic...
Consequently, modern human beings are naive realists who take for granted the accuracy of their misrepresentations of the social world, but actually systematically misconstrue both themselves and other people. Social psychologists have long known that a good deal of what we consider "objective reality" is actually the product of our "unnoticed interpretative manipulations." Before evolutionary psychology, it was not possible to understand exactly what drives people to distort their perceptions, memories, and logic in this way. A biological perspective helps us understand why the mental gears of self-deception engage so smoothly and silently, imperceptibly embroiling us in performances that are so skillfully crafted that they give every indication of complete sincerity, even to the performers themselves.
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