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The psychological phenomenon of illusory superiority was derived from the cognitive bias evident in the criminal case of McArthur Wheeler, who robbed banks with his face covered with lemon juice, which he believed would make it invisible to the surveillance cameras. This belief was based on his misunderstanding of the chemical properties of lemon juice as an invisible ink.
As described by social psychologists David Dunning and Justin Kruger, the cognitive bias of illusory superiority results from an internal illusion in people of low ability and from an external misperception in people of high ability; that is, "the miscalibration of the incompetent stems from an error about the self, whereas the miscalibration of the highly competent stems from an error about others."
Conversely, highly competent individuals may erroneously presume that tasks easy for them to perform are also easy for other people to perform, or that other people will have a similar understanding of subjects that they themselves are well-versed in.
Original studyThe psychological phenomenon of illusory superiority was identified as a form of cognitive bias in Kruger and Dunning's 1999 study "Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments.". . .
Other investigations of the phenomenon, such as "Why People Fail to Recognize Their Own Incompetence" (2003), indicate that much incorrect self-assessment of competence derives from the person's ignorance of a given activity's standards of performance. The pattern of overestimation of competence appeared in studies of reading comprehension, of the practice of medicine, of motor-vehicle operation, and of the playing of games such as chess and tennis. Dunning and Kruger's research also indicates that training in a task, such as solving a logic puzzle, increases people's ability to accurately evaluate how good they are at it.
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