it seems that once again people engage in a search for evidence that is biased toward confirmation. Asked to assess the similarity of two entities, people pay more attention to the ways in which they are similar than to the ways in which they differ. Asked to assess dissimilarity, they become more concerned with differences than with similarities. In other words, when testing a hypothesis of similarity, people look for evidence of similarity rather than dissimilarity, and when testing a hypothesis of dissimilarity, they do the opposite. The relationship one perceives between two entities, then, can vary with the precise form of the question that is asked

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About Thomas Gilovich, How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life

Thomas Gilovich, How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life.

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