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Stuttering is a developmental disorder of speech production that usually emerges in childhood. In this study, a large population-based twin sample from the Australian Twin Registry (1567 pairs and 634 singles aged 17-29 years) was screened to identify twin pairs in which one or both members reported themselves to be affected by stuttering. Telephone(More)
Although the adoption design is the most powerful method to disentangle nature and nurture, it has not been applied previously to developmental speech or language disorders. The present study examined the speech outcomes of 156 adopted and nonadopted children at varying risk for speech disorders based upon self-reported parental speech history. The sample(More)
This investigation is a follow-up to a longitudinal speech and educational outcome study involving approximately 400 normally developing children that was initiated in 1960. From this database, two groups of subjects (now aged 32-34), their spouses, and all of their offspring over the age of 3:0 (years:months) completed a battery of cognitive-linguistic and(More)
UNLABELLED Finding susceptibility genes for complex disorders is the next major challenge facing genetics researchers. The purpose of this paper is to stimulate creative thinking about the gene-finding process for developmental speech disorders (DSDs), specifically disorders of articulation/phonology and stuttering. The paper will begin with a review of(More)
The present investigation is a follow-up to a longitudinal study involving approximately 400 normally developing children begun in 1960. From this large database, two groups of subjects (now aged 32-34) were asked to participate in the present project: (a) a group of 24 adults with a documented history of a moderate phonological/language disorder that(More)
The present investigation is a follow-up to a longitudinal speech and academic study involving approximately 400 normally developing children begun in 1960 by Mildred Templin. From this large data base, the present project invited the participation of two groups of subjects (now aged 32 to 34): (a) 24 adults with a documented history of moderately severe(More)
Potocki-Lupski syndrome (PTLS; OMIM 610883) is a genomic syndrome that arises as a result of a duplication of 17p11.2. Although numerous cases of individuals with PTLS have been presented in the literature, its behavioral characterization is still ambiguous. We present a male child with a de novo dup(17)(p11.2p11.2) and he does not possess any autistic(More)
PURPOSE Using a sample of 20,445 Dutch twins, this study examined the relationship between speech fluency and attentional regulation in children. A secondary objective was to identify etiological overlap between nonfluency and poor attention using fluency-discordant twin pairs. METHOD Three fluency groups were created at age 5 using a parent(More)
PURPOSE To examine neural response to spoken and printed language in children with speech sound errors (SSE). METHOD Functional magnetic resonance imaging was used to compare processing of auditorily and visually presented words and pseudowords in 17 children with SSE, ages 8;6[years;months] through 10;10, with 17 matched controls. RESULTS When(More)
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 relative(More)