Environmental influences on the behavioral phenotype of Angelman syndrome.

Abstract excerpt

Using observational methods, we examined the social influences on laughing and smiling behavior in children with Angelman syndrome by systematically manipulating aspects of social interaction. Seven boys and 4 girls who were between 4 and 11 years of age and who had a confirmed maternal deletion of chromosome 15q11-q13 completed the study. Each child was observed while repeatedly exposed to three conditions in...

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