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Direct linkvan Beijsterveldt, Catharina Eugenie Maria; Felsenfeld, Susan; Boomsma, Dorret Irene – Journal of Speech, Language, and Hearing Research, 2010
Purpose: Behavioral genetic studies of speech fluency have focused on participants who present with clinical stuttering. Knowledge about genetic influences on the development and regulation of normal speech fluency is limited. The primary aims of this study were to identify the heritability of stuttering and high nonfluency and to assess the…
Descriptors: Stuttering, Genetics, Young Children, Twins
Peer reviewedHudziak, James J.; Derks, Eske M.; Althoff, Robert R.; Copeland, William; Boomsma, Dorret I. – Journal of the American Academy of Child and Adolescent Psychiatry, 2005
Objective: To estimate the genetic and environmental contributions to oppositional defiant behavior (ODB) from mother, father, and teacher report using the Conners Revised Short Forms in a large twin sample. Method: ODB data were collected from 1,595 mothers, 1,114 fathers, and 793 teachers of 7-year-old twin pairs from the Netherlands Twin…
Descriptors: Foreign Countries, Psychiatry, Twins, Mothers
