This study evaluated the extent to which measures of lexical diversity (type-token ratio and number of different words produced) differentiated 25 children (mean age 59 months) with specific language impairment (SLI) from typical children. Analysis of utterance samples revealed that SLI children did not differ on type-token ratio but did use…

Findings from studies exploring role of joint attentional focus in children's acquisition of language indicated that language of 24 mothers and their 15- to 21-month-olds inside episodes of joint attentional focus involved more utterances, shorter sentences, more comments, and longer conversations than outside of episodes. Also, object references…

Thirty-four typically developing children (ages 3-6) participated in a multi-trial word-learning task involving nonwords of varying phonotactic probability. Results indicated that common sound sequences were learned more rapidly than rare sound sequences across form and referent learning. Also, phonotactic probability appeared to influence the…

Two studies examined the validity of parent report for measuring language in children with specific language delay using the MacArthur Communicative Development Inventories for comparison. Results suggest that parent report appears to be valid for measuring language production skills in this population. Validity was strongest for vocabulary…

Between their second and fifth years, young children learn approximately 15 new words a day. For every word the child hears, he or she must choose the correct referent out of an infinite set of candidates. An important problem for developmental psychologists is to understand the principles that limit the child's hypotheses about word meanings. A…

Two strategies that children use to figure out new word meanings--attention to linguistic form class and the assumption of lexical contrast--were examined. It was found that very young children use both form class and lexical contrast to interpret new words. (PCB)

Twenty-five preschool children with specific language impairment and 25 controls were evaluated on generalization of trained bound morphemes to untrained vocabulary stems, in 2 training conditions: explicit, trainer verbalization of the affixation "rule" and an "implicit rule" condition. Findings indicated that explicit presentation of…

Evaluation of the validity of the MacArthur Communicative Development Inventory: Words and Sentences with 44 children with Down syndrome and 48 typically developing children established the validity of this parental measure of vocabulary development for children with Down syndrome and confirmed its validity for typically developing children.…

Novel word learning in three conditions (signed only, spoken only, signed and spoken combined) was compared for young children (N=10) with Down syndrome and mental-age matched controls. No group differences in frequency of imitations or productions were obtained. The frequency of imitations was highest in the combined condition. In the combined…

A study of J. Locke's theory of specific language impairment (SLI) found that children (n=10) with SLI who were limited to single-word utterances showed deficits in their lexical comprehension, supporting Locke's proposal. A second study found that children with SLI who had reached the grammatical stage of development showed age-appropriate…

This article reviews methods for assessing vocabulary of young children with hearing impairments including naturalistic observation, parent report measures, and standardized vocabulary tests. It also describes procedures to assess word-learning processes. Cautions on the use of assessment tools with this population are reviewed and suggestions are…

This study, with 19 young children (36-76 months old) with developmental delays, in the first stage of language learning, found that the children used more frequent language and more diverse vocabulary in routine than in nonroutine situations. The protocol for parent identification of routines is appended. (DB)

This study examined the relationship between fast mapping and word learning and between comprehension and production of new words with 30 young children with specific language impairment (SLI). Results suggest that children with SLI may need to hear a new word twice as many times as other children before comprehending and independently using the…

Evaluates the effects of presenting verbal models following the initiations or expressions of interest of 16 children aged 28 to 34 months on both production and comprehension abilities measures. Results suggest that the timing of exposure to language models plays a critical role in language acquisition. (RJC)

The use of deictic words from 5 classes by 4 preschool teachers and 12 children with hearing losses was examined. Teachers used a total of 648 deictic words versus the children's 172 examples. Personal pronouns were the most frequently used class, followed by demonstrative pronouns, adverbs of location, shifting reference verbs, and adverbs of…