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The finding suggests that social fear may be the root cause of racial stereotyping.
French and German researchers examined the behaviors of children with Williams syndrome. These youngsters, who are missing about 26 genes on chromosome 7, are unusually friendly and gregarious because they don't have the sense of fear that other people feel in many social situations.
The study found that children with the syndrome did not make stereotypical judgments when shown pictures of people of different races. In contrast, a group of children without the syndrome displayed strong racial stereotyping when shown the same pictures.
"The unique hypersociable profile of individuals with Williams syndrome often leads them to consider that everybody in the world is their friend," study co-author Andreas Meyer-Lindenberg, of the Central Institute of Mental Health in Mannheim, Germany, and the University of Heidelberg, said in a news release.
"In previous work, we have shown that processing of social threat is deficient in people...