This study investigates the production of vocalization in adult–infant–toy interactions from 0;4 to 0;11. The hypothesis is that vocalizations are selectively uttered in relationship to their production context. Five infants (two girls, three boys) were intensively studied. Non-segmental acoustic features of vocalizations in four communicative contexts were analysed in relation to the individual infants, in order to reveal individual differences. The data were submitted to discriminant function analysis. Results show that (a) different patterns of non-segmental features characterize sounds produced in different contexts; (b) both inter-subject differences and intra-subject consistency are observed; (c) ‘selective production’ disappears after 0;9. These results are discussed in relationship to sound–meaning development.

The two- and three-syllable reduplicative babbling of five French-learning and five English-learning infants (0;5 to 1; 1) was examined in two ways for intonational differences. The first measure was a categorization into one of five categories (RISING, FALLING, RISE-FALL, FALL-RISE, LEVEL) by expert listeners. The second was the fundamental frequency (F0) from the early, middle and late portion of each syllable. Both measures showed significant differences between the two language groups. 65% of the utterances from both groups were classified as either rising of falling. For the French children, these were divided equally into the rising and the falling categories, while 75% of those utterances for the English children were judged to have falling intonation. Proportions of the other three categories were not significantly different by language environment. In both languages, though, three-syllable utterances were more likely to have a complex contour than two-syllable ones. Analysis of the F0 patterns confirmed the perceptual assessment. Several aspects of the target languages help explain these intonational differences in prelinguistic babbling.

The view that grammatical relations have substantial essence, designated as ‘subject’ or ‘object’ has difficulty in accounting for the variety of naturally acquirable grammatical relations. The acquisition of grammatical relations is examined from a theoretical framework, ROLE AND REFERENCE GRAMMAR, in which grammatical relations are decomposed into two separate types of structure: logical (semantic) structure and information (pragmatic) structure. The acquisition of grammatical relations from four languages is compared: (1) the definite accusative suffix and pragmatically motivated word order of Turkish; (2) Kaluli verb agreement, case and focus marking postpositions, and pragmatically motivated word order; (3) Hungarian definite and indefinite verb conjunction; and (4) Italian participial agreement and anaphoric, accusative case pronouns. Two conditions on structures are found to cause difficulty: the neutralization of a semantic or pragmatic distinction by interfering structures (e.g. Kaluli and Italian), and global case marking which forces the child to discover relevant semantic characteristics of both the actor and the undergoer (e.g. Hungarian and Kaluli). Structures that encode semantic or pragmatic distinctions independently are more easily acquired (e.g. Turkish). Piecing together discrete structures in a mosaic fashion, the child can acquire the great variety of grammatical relations that exist in human languages.

One of the most widely used indices of language development is a measure of utterance length in morphemes (MLUm). This study examines the applicability of MLUm to the acquisition of Irish. MLUm was calculated for data from Cian, aged 1;11–3;0. Even when an attempt was made to ‘assume the maximum’ by counting all possible morphemes, the correlation between a morpheme MLU (MLUm) and a word count MLU (MLUw) was very high (0·99). This points to MLUw being as effective a measure of Irish development as MLUm, as well as being easier to apply and more reliable. MLUw was calculated for the two younger children in the study (Eibhlís 1;4–2;1 and Eoin 1;10–2;6). An examination of the relationship between the three children's MLUw values and their grammatical complexity as measured on ILARSP (the Irish adaptation of LARSP) indicates that MLUw is a useful preliminary index for early development in Irish. However, further data are necessary to check whether MLUw loses its predictive relationship with grammatical complexity after a certain point. The study emphasizes the caution necessary in applying MLU to languages whose acquisition has not hitherto been studied, and underlines the role of MLU as a preliminary measure, which must not be overinterpreted.

Data from an experiment on gender acquisition with 160 Spanish children from four to eleven years of age are presented in this paper. In Spanish there are three possible clues (semantic, morphophonological and syntactic), that speakers can use to determine the gender of a noun and the agreement of other variable elements accompanying it. Items where only one of the clues was present, items where there was a combined effect of two of them in agreement (both were feminine or masculine), and items where clues were in conflict (one masculine and the other feminine) were introduced in the experiment. This experimental manipulation made it possible to test the relative strength of the different types of competing clues. In particular, the aim of the present study was to determine the relative importance of intralinguistic and extralinguistic clues, as evidenced by the ability of Spanish children to recognize the gender of a noun upon hearing it in a particular frame, and consequently, to establish the agreement of other variable elements accompanying it. A procedure similar to that used by Karmiloff-Smith (1979).was employed. The results (which are compared with those obtained in other languages) give support to the theoretical view that children pay far more attention to syntactic and morphophonological (intralinguistic) information than to semantic (extralinguistic) information.

This on-line study investigates the processing of word order by 30 French children (6;6, 8;6, 10;6) and 10 adults. Its main objective is to show that the privileged status granted to ‘canonical SVO sentences’ is inadequate to account for the on-line processing of pronominal utterances in spoken French. Using a word monitoring task, we showed that word order (NVN vs NNV): (1) is a significant factor in sentences containing no clitic pronoun; (2) stops being significant when sentences contain either one or two clitic pronouns. These results suggest that processing complexity depends upon co-reference (‘linear’, ‘crossed’ or ‘embedding’) assignment constraints rather than upon word order per se. We conclude that, in French, word-order processing always interacts with acceptability considerations provided by cliticization.

This paper concerns the development of semi-modal want/want to, and modals may, can and could in two Trinidadian children, whose Verb Phrase development was studied in naturalistic settings, between the ages of 2;3 and 4;1, and 2;4 and 4;9. The similarities and differences in development between the two are important for underlining a number of key factors in the acquisition process. Accepting the salience of requests/demands in early child language, the study draws attention to the child's propensity for using the means most readily available to him/her in the input, for expression of this function. Additionally, there is evidence of the child's ability to make stylistic discriminations at a very early age and of the propensity for making semantic distinctions among forms. The study indicates that work on the development of grammatical features is incomplete without consideration of sociolinguistic aspects of usage as integral to grammatical acquisition from the outset.

Attempts were made to elicit poems from 133 children between the ages of 2;3 and 6;11. Seventy-eight of the children produced 606 poems between them. Forty-five per cent of the poems contained the syntactic device of modified repetition: a substitution exercise where a grammatical frame is repeated and the substitution occurs in part of the grammatical frame. This was so despite the fact that modified repetition was not present in the examples that were used to elicit poems from the children. The frequency and types of modified repetition used by the children did not vary much with age. The question of whether children's use of modified repetition in their rhythmical poems has the function of helping them to practise grammatical forms, or whether it is simply one reflection of a general human tendency towards the use of pattern in language, is discussed.

This study examines the use of the co-temporal connectives when, while and as in the elicited narratives of 71 children between 4;10 and 11;11. A group of 26 adults provided comparison data. Subjects were asked to ‘tell a story’ about each of three sets of story pictures. Analysis of the adult data confirmed a preference for preposed over postposed when clauses and supported the notion of a continuum of simultaneity for when, while and as. The oldest children (like the adults) were more likely to prepose when clauses than were younger children, a finding which suggests that with increasing awareness of the information needs of the listener, children begin to use preposed adverbial clauses as information ‘guideposts’. Surprisingly, however, children in general were far more likely than adults to use durative predicates with when clauses and did not use co-temporal as – substituting when or while in those contexts in which as appeared in the adult protocols. These two findings are shown to be connected, since aspect in the adult data is differentially distributed with respect to the three connectives. It is hypothesized that for narrative purposes children acquire when before while and while before as, in the order of increasing specificity and constraint, with the determining factor being a convergence of syntax, semantics and information flow.

Young speakers in dialogue must establish mutual knowledge. Traditionally, researchers have focused on how children used indefinite and definite articles to signal novel and shared information. In this study of 170 children aged seven to thirteen, the form of introduction chosen, whether question or statement, is more significant than the type of article used. No developmental effects on article use emerge, with statement + indefinite always the least common choice. However, young speakers use question introductions significantly less than older children. There is also a developmental interaction between speakers' and listeners' behaviour. Question introduction elicit effective listener responses at all ages, but only twelve-year-olds respond reliably to statements. Unfortunately, young speakers prefer just those forms of introduction to which young listeners are least likely to provide informative feedback. Thus two separate developmental effects appear to combine to hamper young subjects' chances of achieving successful communication in dialogues.

This study investigated the changing functions of evaluative devices in children's narratives. The evaluative devices included (a) references to ‘frames of mind’, particularly to emotions, (b) character speech, (c) ‘hedges’, (d) negative qualifiers, and (e) causal connectors. Narratives were elicited from a 24-picture story book. The subjects were three groups of native English-speaking Americans (12 per group): five- and nine-year-old children and college undergraduate students. A quantitative comparison revealed that (i) adults used evaluative devices three times as often as five-year-olds, and two-and-a-half times as often as the nine-year-old children; (ii) adults used significantly more references to ‘frames of mind’ and ‘hedges’ than the children; and (iii) whereas five-year-olds used each evaluative type equally often, nine-year-olds and adults used references to ‘frames of mind’ significantly more than the other four evaluation types. A second analysis, focusing specifically on the discourse functions of references to ‘frames of mind’ revealed that, early on, this particular device is used to express a local evaluative perspective on particular events, while with increasing age it is used to signal the hierarchial organization of the story events. These findings are discussed with regard to two non-linguistic developmental achievements, the formation of event schemas and the formation of a theory of mind.