Using an infant speech identification (ISI) procedure, English language environment infants, two- and six-year-old children, and adults were tested for their identification of sounds on a native (voiced/voiceless bilabial stop) and a non-native (prevoiced/voiced bilabial stop) speech continuum. Categorical perception of the two contrasts diverged as a function of age, increasing for the native contrast and decreasing for the non-native between two and six years. In Experiment 2, subjects of the same four ages were tested for their identification of a continuum of harmonic tones varying in pitch. Comparison of the results of Experiment i with the essentially continuous perception of this pitch continuum supports the view that the perception of the native contrast becomes more categorical with age, while perception of the non-native contrast becomes less categorical, especially at six years. Experiment 3, in which adults were tested on the three continua with a multi-trial open set procedure, demonstrated that results with the ISI procedure in Experiments 1 and 2 are comparable to results with more traditional methods. The results of the three experiments are discussed in terms of the role of specific linguistic experience in the development of categorical speech perception.

An unusual phonological pattern exhibited by a child aged 2;9 is described. The pattern involved the production of word-final strident continuants in words whose adult forms contain these features in initial, rather than final position (e.g. [ops] for soap). The data are interpreted as compatible with models of child phonology that permit direct mapping of features to final position.

Temporal correspondences between the attainment of specific milestones in play and language were examined through a longitudinal study of four Japanese children (aged 0;7 to 0;11 at the beginning of the study). There were developmental correspondences between the onset of six language landmarks (the emergence of first words, naming words, vocabulary spurts, word-chains, nonproductive two-word utterances, productive two-word utterances) and the onset of subcategories of play. Language and play both reflected the development of underlying symbolic ability, and both developed in a parallel manner at the single-word stage. After the emergence of word-chains, language and play developed interdependently. All the children proceeded through the same sequence of stages, but the rate of development was different depending on their environment.

Four kinds of language learning-related behaviours (LLRBs) were examined in the home conversations of six English children studied for six months from age 2;0 to 2;6. The speech of the children was coded for the number of times they participated in language lessons, language practice, metalanguage and revisions of prior language. All the children were active and frequent producers of LLRBs, with revisions being observed most commonly. Further analysis revealed that the majority of the revisions that the children initiated involved grammatical changes, with the revised utterances tending to be more grammatical than their predecessors. An auditory monitor is proposed as a partial explanation for revision behaviour, and is evaluated relative to other possible accounts of the findings.

Various theories of learning for the categories COUNT NOUN and MASS NOUN are compared. It is argued that children assign words to these categories on the basis of intuitions arising from perception that are relevant to Macnamara's (1986) semantic definitions of the categories. These definitions rest on the centrality of identity in the meaning of nouns and the centrality of individuation in the meaning of count nouns but not mass nouns. Empirical evidence is presented that supports the hypothesis that young children classify words as count nouns or mass nouns on the basis of perceptual information about the extension of the words, that is, whether or not the extension consists exclusively of enduring individuals whose discreteness from one another is perceptually salient (count nouns) or not (mass nouns). In an experiment, 48 children with a mean age of 2;10 (S.D. = 0;5) were taught a word for a kind of object (i.e. a perceptually distinct individual) or for a kind of substance (i.e. a collection of small granules). For some children the word was syntactically COUNT and for others it was syntactically MASS. Half of the children received incongruous perceptual and syntactic cues. For most of these children, classification of the word was guided by the object- or substance-like appearance of the stimulus despite the presence of incongruent syntactic cues. Syntactic cues influenced classification of the word for a minority of subjects, most of whom were among the oldest in the sample. It is concluded that perceptual information is critical in early decisions about membership in the categories COUNT NOUN and MASS NOUN.

This study investigated the claim that very young children avoid backwards coreference in their interpretation of sentences containing pronouns. Eighty-one children ranging in age from 3;1 to 8;0 and eight adults acted out four types of pronominal sentences. Cross-sectional data and individual response patterns reveal that children initially, prefer internal coreference even when such a response is disallowed for structural reasons. Avoidance of backwards coreference appears to be a late developing phenomenon characteristic of six-year-olds. Adult response patterns, which are manifested by some very young children, emerge as the dominant pattern by age seven.

An extensive fuzzy boundary was identified within the adult extension of two exemplary object-words, ‘dog’ and ‘ball’. The fuzzy boundaries were incorporated into the standard of adult extension against which the preschool child's use of ‘dog’ and ‘ball’ was compared, and the investigation provided a framework in which children's responses to fuzzy boundary referents could be accommodated. Responses to fuzzy boundary referents were considered as having precedents within adult extension and the data revealed the provision of precedents for a significant number of the young child's applications and non-applications of the words. The investigation concluded that, through adherence to an oversimplified concept of adult extension, previous research has underestimated the degree of correspondence that exists between child and adult extension.

Shared book reading is considered to be an influential factor in language and literacy development and has been associated with more complex and demanding forms of tutorial language use. The present study seeks to examine mothers' discourse in joint picture book reading in terms of the level of representational demand which it places on the child, that is the extent to which it requires the child to engage in abstract thought. This was compared with the language used in another interactive, but more product oriented task, modelling a clown using play-doh. Twenty-four mother child dyads (in which the mean age of the children was 4;2) were videotaped while engaged on these tasks and the conversation was analysed for representational demand (levels of abstraction), interactive features and communicative function. The mother's conversation was found to be at a higher level of abstraction in reading than in play-doh modelling. The accuracy of child responses to high level requests for information was superior for reading, while responses to low level requests were similar in both situations. The interactive categories were more utterance-based and less attention-based than in the modelling task.

The early production of nine cohesive devices during narration about personal experience was examined in an 18-month longitudinal study of 10 children between approximately age 2;0 and 3;6. The specification of noun phrases and types of noun errors were also explored. The number of cohesive ties increased with both age and MLU, due to increased pronominal reference and conjunctions (while clausal and verbal ellipsis decreased). Specific cohesive devices also were acquired at different MLU levels. Most noun phrases were non-problematic and errors declined with increasing age and MLU; specifically, noun omissions declined. However, when new nouns were introduced, approximately one out of five were ambiguous throughout the study. Thus, children's narratives become more comprehensible with age as cohesive links increase and noun errors decrease, but at 3;6 children are still having difficulty properly managing the introduction of novel nouns.

Defining is a metalinguistic skill. This study charts the development of the ability to define. A total of 120 participants (40 at each of the ages of 10, 14 and 18 years) defined eight concrete and eight abstract nouns. Each definition was coded to identify the types of responses present in it. Results indicate that there are significant differences in the way concrete and abstract nouns are defined. All three age-groups defined concrete nouns mainly by class and characteristic responses. But it was not until age 18 that abstract nouns were defined by class and characteristic responses. The development of abstract noun definitions follows the development of concrete noun definitions. The ability to define is dependent upon knowledge of the meaning of the word but it is also dependent upon implicit or explicit knowledge of the definitional form. The ability to define abstract nouns is a late developing metalinguistic skill.

This study reports on four school-age boys' use of the specialized register of sportscasting as performed both spontaneously and when elicited by the researcher, and compares the boys' production of formal register-marking features to adult usage. Like the commentary of professional sportscasters, the boys' commentating is characterized by heavy use of simple-present action verbs, use of constructions lacking elements that are ordinarily grammatically required (the subject pronoun he, an auxiliary verb, or a main verb), and (in the elicited version) frequent occurrence of passives. The boys invest the most ‘ungram-matical’ utterance types (those lacking finite verbs) with a function that is not clearly present in adult sportscasting discourse, that of pointing forward in the discourse.

Twenty Italian six-year-olds and 20 eight-year-olds were asked to interpret eight ambiguous and eight clear definite descriptions. All ambiguous descriptions could refer to three drawings, one of which had been described by the subjects immediately before the comprehension task. In half of the trials with ambiguous messages the children's interlocutor was present while the children were describing the drawings; in the other half he was absent. In both conditions subjects showed a preference for the referents they had already described, indicating that they applied egocentrically a comprehension strategy based on the Maxim of Antecedent (Jackson & Jacobs, 1982). Children's failures to differentiate their responses in the two conditions are considered to be due to difficulties in taking account of the given-new distinction for relevant information.

This study investigates young children's understanding of homophones in two different linguistic contexts. Research has shown that children interpret homophones according to their ‘primary’ sense even though this is inappropriate to the linguistic context. The present study investigates the influence of different contexts on their interpretations of homophones. A picture test, similar to the British Picture Vocabulary Scale (BPVS), was devised, depicting ten homophones in both their primary and secondary senses. Forty-eight children who were in matched pairs following the BPVS pre-test and whose ages ranged from three to six were asked to select the picture which showed the homophone, first when the homophone was in no linguistic context, and secondly following one of two conditions of the same story which differed according to the richness of context provided. Results showed that those children assigned to story B, the expanded version with full linguistic details and explanations of the words it contained, were more able to identify correctly the secondary meanings of the homophones intended than those children given story A, the unexpanded version. Analyses of variance showed both a significant age trend and a story-type effect. These results are interpreted as showing that the linguistic context is an important factor in young children's understanding of word meaning.