Language development in young twins: biological, genetic and social aspects.
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To understand better the cognitive sequelae of mild perinatal brain injury, we studied three groups of high-risk infants, using the Early Language Milestone Scale (ELM Scale). Premature infants with Grades I and II intraventricular hemorrhages (IVH) were delayed on the expressive but not the receptive subscale of the ELM Scale. Mildly asphyxiated full-term infants were slightly delayed on both the expressive and receptive subscales. Premature infants without IVH performed the same as the normal sample on which the scale was based. Although normal intellectual functioning has been reported in infants with Grade I-II IVH, this study demonstrates early specific deficits in expressive language in these children. These results are discussed in relation to localization of language in the adult brain, and the influence of subcortical structures on development and maturation of the cortex.
The turn exchanges of normally developing 8-year-old boys and girls were examined within adult-child dyadic interaction. Videotaped language samples were analyzed for gender differences in the children's production of simultaneous and nonsimultaneous speech. The results indicated no gender differences for nonsimultaneous turn exchange behaviors but significant differences in the overlap subtypes and simultaneous resolution patterns between the boys and the girls. Sex of the adult partner influenced the negotiation and ultimate length of the children's turns. The children's gender differences were consistent with the adult literature that characterizes men as more assertive conversationally than women.
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Examined the impact of recurrent otitis media in the first 3 years of life on verbal abilities of 3- to 4-year-old children and the potential for parental verbal stimulation to buffer the negative effects of intermittent hearing loss. Fathers and mothers of 56 children with variable histories of otitis media participated in videotaped parent-child interactions that were used to code level of parental verbal stimulation. Measures of the children's verbal abilities were the McCarthy Verbal Scale Index and a score for the child's verbalizations with each parent. Active and engaging parental verbalizations appeared to buffer the child's developing verbal abilities from the deleterious effects of recurrent otitis. Post hoc analyses examined the implications of task structure and parent sex on parent verbal stimulation. Discussion addresses the importance of paternal involvement for the home language environment and implications for intervention.
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