Vocabulary development

About: Vocabulary development is a research topic. Over the lifetime, 6053 publications have been published within this topic receiving 241375 citations.

Variability in Early Communicative Development

Abstract: Data from parent reports on 1,803 children--derived from a normative study of the MacArthur Communicative Development Inventories (CDIs)--are used to describe the typical course and the extent of variability in major features of communicative development between 8 and 30 months of age. The two instruments, one designed for 8-16-month-old infants, the other for 16-30-month-old toddlers, are both reliable and valid, confirming the value of parent reports that are based on contemporary behavior and a recognition format. Growth trends are described for children scoring at the 10th-, 25th-, 50th-, 75th-, and 90th-percentile levels on receptive and expressive vocabulary, actions and gestures, and a number of aspects of morphology and syntax. Extensive variability exists in the rate of lexical, gestural, and grammatical development. The wide variability across children in the time of onset and course of acquisition of these skills challenges the meaningfulness of the concept of the modal child. At the same time, moderate to high intercorrelations are found among the different skills both concurrently and predictively (across a 6-month period). Sex differences consistently favor females; however, these are very small, typically accounting for 1%-2% of the variance. The effects of SES and birth order are even smaller within this age range. The inventories offer objective criteria for defining typicality and exceptionality, and their cost effectiveness facilitates the aggregation of large data sets needed to address many issues of contemporary theoretical interest. The present data also offer unusually detailed information on the course of development of individual lexical, gestural, and grammatical items and features. Adaptations of the CDIs to other languages have opened new possibilities for cross-linguistic explorations of sequence, rate, and variability of communicative development.

Early vocabulary growth: Relation to language input and gender.

Abstract: This study examines the role of exposure to speech in children's early vocabulary growth. It is generally assumed that individual differences in vocabulary depend, in large part, on variations in learning capacity. However, variations in exposure have not been systematically explored. In this study we characterize vocabulary growth rates for each of 22 children by using data obtained at several time points from 14 to 26 months. We find a substantial relation between individual differences in vocabulary acquisition and variations in the amount that particular mothers speak to their children. The relation between amount of parent speech and vocabulary growth, we argue, reflects parent effects on the child, rather than child-ability effects on the parent or hereditary factors. We also find that gender is an important factor in rate of vocabulary growth. Early childhood is a period of rapid linguistic development. By 2 years, the average child acquires 900 root words (cf. Carey, 1978) and at least a rudimentary syntax (cf. Brown, 1973). Although there has been considerable recent interest in syntactic development, much less attention has been devoted to lexical development. Yet in tracing the development of language from its inception, lexical development must necessarily be a focus of study because the acquisition of words constitutes the child's initial achievement as a language user. A certain amount of vocabulary must be acquired before words can be combined into sentences, and, indeed, several months elapse between the time children start to produce words and the time they start to produce multiword utterances. In addition, vocabulary and syntax are not independent aspects of language knowledge; for example, verbs frequently encode actions involving relations among entities (e.g., give, feed) which are specified by the verb together with its arguments. A major concern in the recent work on syntactic development has been with the relative contributions of the child's innate preparedness for language versus language input. Yet the rapid growth of vocabulary in early childhood also is a manifestation of the human preparedness for language, and parallel questions arise concerning the relative contributions of capacity and input. Especially at the start of language learning, innate preparedness surely plays a role in acquiring word meanings because inferences about meanings are based on pairings of words with situations. As Quine (1969) has persuasively argued, the variety of aspects of a situation which might be encoded by a word is enormous. Because of this, Gleitman and Wanner (1982) point out, it seemscritical to posit innately available constraints on the possible meanings children entertain.

Joint Attention and Early Language.

Abstract: This paper reports 2 studies that explore the role of joint attentional processes in the child's acquisition of language. In the first study, 24 children were videotaped at 15 and 21 months of age in naturalistic interaction with their mothers. Episodes of joint attentional focus between mother and child--for example, joint play with an object--were identified. Inside, as opposed to outside, these episodes both mothers and children produced more utterances, mothers used shorter sentences and more comments, and dyads engaged in longer conversations. Inside joint episodes maternal references to objects that were already the child's focus of attention were positively correlated with the child's vocabulary at 21 months, while object references that attempted to redirect the child's attention were negatively correlated. No measures from outside these episodes related to child language. In an experimental study, an adult attempted to teach novel words to 10 17-month-old children. Words referring to objects on which the child's attention was already focused were learned better than words presented in an attempt to redirect the child's attentional focus.

We Acquire Vocabulary and Spelling by Reading: Additional Evidence for the Input Hypothesis

Abstract: attention to vocabulary and spelling.' First, there are practical reasons. A large vocabulary is, of course, essential for mastery of a language. Second language acquirers know this; they carry dictionaries with them, not grammar books, and regularly report that lack of vocabulary is a major problem. Spelling, especially for treacherous languages such as English, is also a problem. Our standards in spelling are 100%; a single spelling error in public can mean humiliation. On the theoretical level, the study of the acquisition of vocabulary and spelling ability can help us understand language acquisition in general. In my view, the most promising hypothesis is that vocabulary and spelling are acquired in fundamentally the same way the rest of language is acquired. If this supposition is true, these areas can be useful laboratories for the