This paper investigates the relationship between a child's degree of bilingualism and features of parental input. It seeks to demonstrate that parental discourse strategies have a direct bearing on the levels of mixing present in the child's utterances in his weaker language, English. It is based on the longitudinal study of a Catalan/English bilingual child from 1;3 to 4;2 years old. The strategies adopted by both parents in response to their child's mixing are examined following Lanza's (1992, 1997) categorization of parental discourse strategies. Whereas the Catalan-speaking mother negotiates a bilingual context of interaction with her son, as of the child's third year, the English-speaking father endeavours to impose a monolingual context. Such a change of strategy clearly favours the child's increasing use of the minority language, which entails a sharp decline in rates of mixing. It appears that parents' pragmatic choices may have an impact on the development of productive family bilingualism.

Two-, three-, and four-year-old children were tested on a variation of Wason's (1965) procedure for testing the effects of plausibility on the comprehension of negative statements. It was found that negatives about an exceptional item in an array, i.e. plausible negatives, were understood before implausible negatives. Reaction time data revealed that plausible negatives were also processed more rapidly for three- and four-year-olds. An additional effect on plausibility, namely the degree of confusability between the different items in an array, was proposed, and was found to become increasingly salient with age.

Verb-pattern alternation in Hebrew is characterized in terms of consonantal roots associated with a fixed set of morphological patterns in the lexicalized expression of categories such as causative, reflexive, inchoative and passive. It is assumed that at first Hebrew-speaking children will use a verb-root in one invariant pattern, and hence may also neutralize required morpho-semantic distinctions. Observational and experimental data from children aged 2; 6 to 5; 6 reveal a development in linguistic control of the system from non-alternation to near-mastery, with the concepts of causativity and distinctions in transitivity being lexicalized earlier than others. These findings are discussed in terms of the interplay between linguistic and conceptual development, and the evidence from language acquisition for linguistic theory.

Although it has long been observed that some children incorporate unglossable syllables into their early utterances, it has been difficult to integrate these ‘fillers’ into theories of language acquisition. Because they straddle boundaries between phonology and morphosyntax, and between pragmatics and lexicon, they do not fit neatly into linguists' notions about ‘modules’ of language. Fillers have been reported in quite an array of languages, and yet they seem to be more common among learners of some languages than others. Even when language is held constant, children seem to vary immensely as to whether they produce fillers at all. With more researchers reporting fillers in more languages, it seems time to (1) review what we now know about fillers; (2) propose a reasonably unified set of criteria for identifying them; and (3) suggest an approach that will promote their further study.

The study investigates the development of English multiword negation, in particular the negation of zero marked verbs (e.g. no sleep, not see, can't reach) from a usage-based perspective. The data was taken from a dense database consisting of the speech of an English-speaking child (Brian) aged 2;3–3;4 (MLU 2·05–3·1) and his mother. The focus of the study was the emergence and usage of negators in the child's and mother's speech (e.g. no, not, can't, won't, don't). Two analyses were conducted: firstly, the emergence and usage of all negators in Brian's speech and in the input were calculated in order to present an overall picture of negator usage across the sample. The findings indicate a gradual and systematic development of negator selection in Brian's speech which follows the trajectory no–not–'nt. The pattern of negator emergence was found to follow the frequency of negators in the input; that is negators used frequently in the input were the first to emerge in the child's speech. Secondly, a more fine-grained analysis of utterances containing negated zero marked verbs (neg V utterances) was conducted on both the child's and mother's speech. In the first instance the development of negator selection for all neg V utterances was calculated. The results indicated the same no–not–'nt cline as attested in the initial analysis. A function-based analysis of neg V utterances was also conducted which indicated that the speed of movement across the no–not–'nt cline varied from one function to the next. A function-based analysis of the input suggested that the speed at which Brian moved across the cline within a particular function could be traced to function-based frequency effects in the input. Thus the findings of the study indicate function-based, input-driven learning which is consistent with the usage-based approach. However the findings also indicate creative learning on the part of the child from the earliest stages of multiword negation.

Negative utterances were collected longitudinally from two English-, five French- and four Korean-speaking children between 1;7 and 3;4. An analysis focusing on both non-verbal context and linguistic form led to the distinction of nine semantic/pragmatic categories which could capture cognitive and linguistic development in some detail: non-existence, prohibition, rejection, failure, denial, inability, epis-temic negation, normative and inferential negation. The nine categories were found in all three languages and their developmental order was similar across the languages. Different patterns were shown concerning the form-function relationship for different categories; for some categories, the distinct form emerged gradually after the function was acquired, while for others, the distinct form emerged simultaneously with the new function. Thus new forms emerged to subdivide an old category or to express a new function. This pattern was most typical for categories developed at later periods. It is suggested that whereas cognitive development precedes language development at an early period, at later periods cognitive and language development interact with each other.

The speech of 36 mothers to their infants in a face-to-face situation at ages 6, 13 and 26 weeks was compared with unfamiliar adults' speech to the same infants, the mothers' speech to an interviewer, and their conversations with the same children 2 years later. Speech to the infants was quite different from so-called ‘baby talk’, but contrary to other authors the speech to infants was even shorter, more repetitive, and more limited in content than the speech to language-learning children. Differences appear due to the infant's changing status in the relationship, from a potential to an actual conversant.

The ability to define words by means of other words, which forms a part of many standardized tests, must be learned by a child. The nature of the ‘definitional task’ and the development of language responses (from children 4; 5 to 7; 5) are discussed in terms of a linguistic analysis of the definitional form and its semantic relations. Progress in definitional strategies by children moves along two continua: conceptually from the individually experiential to the socially shared; and syntactically from actual predicates through hypothetical predicates to adult definitional sentence frames. Implications include novel elicitation techniques, psycholinguistically informed evaluation of direction and scoring measures of some common standardized verbal tests, and better understanding of the range of normal development on one specific language task.

Forty children, aged 1 ; 8–2 ; 0, participated in one of three training conditions meant to enhance their comprehension of the spatial term under: the +Gesture group viewed a symbolic gesture for under during training; those in the +Photo group viewed a still photograph of objects in the under relationship; those in the Model Only group did not receive supplemental symbolic support. Children's knowledge of under was measured before, immediately after, and two to three days after training. A gesture advantage was revealed when the gains exhibited by the groups on untrained materials (but not trained materials) were compared at delayed post-test (but not immediate post-test). Gestured input promoted more robust knowledge of the meaning of under, knowledge that was less tied to contextual familiarity and more prone to consolidation. Gestured input likely reduced cognitive load while emphasizing both the location and the movement relevant to the meaning of under.

Very young children perceive colour normally and possess the concept of colour, but it has been widely reported, on the basis of informal observation or normative assessment, that beginning colour naming is confused and that accurate and consistent colour naming is relatively retarded developmentally. A neutral test was devised to compare experimentally 3-year-olds' abilities to make colour-to-name versus shape-to-name associations. Children learned colour-label associates significantly more slowly than matched shape-label associates, and they committed more errors with colours than with shapes during learning. The design of this study eliminates several explanations often proposed to explicate retarded colour naming, including relative perceptual salience, differential experience, and immature cognitive development, and, in their stead, opens the possibility that the difficulty underlying beginning colour naming may reflect specific word-to-colour associations.

A Reichenbach-type theory is proposed that accounts for a child's early system of temporal reference and relates it directly to the adult system. This theory makes predictions different from those of a competing theory, a strong decentring hypothesis. Experimental results and data from spontaneous speech are examined, and the predictions of the first theory are borne out: young English-speaking children express notions of temporal ordering as well as aspectual notions.

Two experiments were conducted to examine infants' reliance on object shape versus colour for word generalization to animate and inanimate objects. A total of seventy-three infants aged 1;4 to 1;10 were taught labels for either novel vehicles or novel animals using a preferential looking procedure (Experiment 1) or an interactive procedure (Experiment 2). The results of both experiments indicated that infants limited their word generalization to those exemplars that shared shape similarity with the original referent for both animate and inanimate objects. These findings indicate that a strong reliance on shape is present earlier than previously shown. In Experiment 2, reliance on shape to generalize novel words did not vary as a function of vocabulary size. Thus reliance on shape versus colour for word generalization does not appear to increase in strength as a function of word learning during late infancy.

The two studies presented here explore the relationship between children's pragmatic skills and their growth in grammar. In study 1, thirty normally developing children were videotaped interacting with their parents at 1;2 and again at 2;7. Using correlational and regression techniques, we found that pragmatic accomplishments of MUTUAL ATTENTION, as well as mother's conversational style, explained 45% of the variance in grammar at 2;7. The second study investigated pragmatic–grammatical relationships with data from 6 high-functioning children with autism. To control for individual variation in skill level at the start of the study, within-individual growth rates for grammar were estimated as our outcome. The results substantiated those of study 1, in that pragmatic accomplishments within mutual attention predicted the per month growth rate in grammar. We interpret these findings as consistent with the position that the infant's social-pragmatic skills contribute to the acquisition of grammar.

Before they are three years old, most children have started to build coherent discourse. This article focuses on one important linguistic device children have to learn: connectives. The main questions are: Do connectives emerge in a fixed order? And if so, how can this order be explained? In line with Bloom et al. (1980) we propose to explain similarities in the development in terms of cumulative cognitive complexity: complex relations are acquired later than simple ones. Following a cognitive approach to coherence relations, we expect positive relations to be acquired before negatives and additives before temporals and causals. We develop a multidimensional approach to the acquisition process in order to account for the variation among children. Hypotheses were tested by analyzing data from children aged 1 ; 5–5 ; 6 on the emergence of Dutch connectives. The multidimensional approach of cognitive complexity describes both the uniformity and the diversity in the developmental sequences of Dutch-speaking and English-speaking children.

Functional and referential changes in maternal speech were investigated in a developmental study of nineteen mother–infant dyads, using video recordings of their free play at three and six months. The role of the infant in influencing speech adjustments was investigated by analysing the relationships between different types of maternal speech and different infant behavioural modes. Three general modes were differentiated – Communicative, Praxic and Other – and, regardless of infant age, mothers were found to make some modifications to their speech style as a function of infant mode. Speech style also was found to change, at a pragmatic level, from three to six months. Both findings support the conclusion that maternal speech is influenced by non-linguistic behavioural ‘feedback’ from infants. However, a finding that affect-oriented speech is more sensitive to infant behaviour than informative speech supports Brown's (1977) contention that the maternal speech register is shaped by two relatively independent interpersonal functions – the affective and communicative components. It is argued that a fuller account of maternal conversational adjustments to prelingual infants requires both a dialogic and a monologic explanation.

How might syntactic bootstrapping apply in Turkish, which employs inflectional morphology to indicate grammatical relations and allows argument ellipsis? We investigated whether Turkish speakers interpret constructions differently depending on the number of NPs in the sentence, the presence of accusative case marking and the causative morpheme. Data were collected from 60 child speakers and 16 adults. In an adaptation of Naigles, Gleitman & Gleitman (1993), the participants acted out sentences (6 transitive and 6 intransitive verbs in four different frames). The enactments were coded for causativity. Causative enactments increased in two-argument frames and decreased in one-argument frames, albeit to a lesser extent than previously found in English. This effect was generally stronger in children than in adults. Causative enactments increased when the accusative case marker was present. The causative morpheme yielded no increase in causative enactments. These findings highlight roles for morphological and syntactic cues in verb learning by Turkish children.

This study compares homonym learning to novel word learning by three- to four-year-old children to determine whether homonyms are learned more rapidly or more slowly than novel words. In addition, the role of form characteristics in homonym learning is examined by manipulating phonotactic probability and word frequency. Thirty-two children were exposed to homonyms and novel words in a story with visual support and learning was measured in two tasks: referent identification; picture naming. Results showed that responses to homonyms were as accurate as responses to novel words in the referent identification task. In contrast, responses to homonyms were more accurate than responses to novel words in the picture-naming task. Furthermore, homonyms composed of common sound sequences were named more accurately than those composed of rare sound sequences. The influence of word frequency was less straightforward. These results may be inconsistent with a one-to-one form–referent bias in word learning.

Two studies investigating young readers' use of conjunctions are reported. In Study One, 145 eight- to ten-year-olds completed one of two narrative cloze tasks in which different types of conjunction were deleted. Performance for additive conjunctions was not affected by age in this study, but older children were more likely to select the target conjunction than were younger children for temporal, causal, and adversative terms. Performance was superior in the cloze task in which they were given a restricted choice of responses (three vs. seven). In Study Two, 35 eight- and nine-year-old good and poor comprehenders completed the three-choice cloze task. The poor comprehenders were less likely to select the target terms in general. Sentence-level comprehension skills did not account for their poor performance. The results indicate that understanding of the semantic relations expressed by conjunctions is still developing long after these terms are used correctly in children's speech. The findings are discussed in relation to the role of conjunctions in text comprehension.

There have been relatively few studies on tone acquisition, as compared to studies on the acquisition of segmentals, morphology, and syntax. Still fewer are the studies on Chinese language acquisition. The present paper reports on a longitudinal case study of a Cantonese-speaking child aged 2; 8 and considers the implications of tone acquisition for tone studies in general, and Cantonese tonology in particular.

The acoustic-phonetic realizations of words can vary dramatically depending on a variety of within- and across-talker characteristics such as regional dialect, native language, age, and gender. Robust word learning requires that children are able to recognize words amidst this substantial variability. In the current study, perception of foreign-accented words was assessed in four- to seven-year-old children to test how one form of variability influences word recognition in children. Results demonstrated that children had less accurate word recognition than adults for both native- and foreign-accented words. Both adults and children were less accurate at identifying foreign-accented words compared to native-accented words with children and adults showing similar decrements. For children, age and lexicon size contributed to accurate word recognition.