This paper reports the preliminary results of a study examining the role of structural overlap, language exposure, and language use on cross-linguistic influence (CLI) in bilingual first language acquisition. We focus on the longitudinal development of determiners in a corpus of two French–English children between the ages of 2;4 and 3;7. The results display bi-directional CLI in the rate of development, i.e., accelerated development in English and a minor delay in French. Unidirectional CLI from English to French was instead observed in the significantly higher rate of ungrammatical determiner omissions in plural and generic contexts than in singular specific contexts in French. These findings suggest that other language-internal mechanisms may be at play. They also lend support to the role of expressive abilities on the magnitude of this phenomenon.

Ninio & Bruner (1978) added an important dimension to the study of early lexical acquisition by drawing attention to the dialogue-like nature of the mother-child interactions where presumably much language-learning takes place. The authors pointed to the well-established findings that much of the child's early speech consists of names for people and objects (Leopold 1949, Werner & Kaplan 1963, Nelson 1973, Greenfield & Smith 1976). They went on to show that in one familiar type of parent–child interaction, joint picture-book reading, labels are used extensively by the adult and are inserted skilfully into a structured interactional sequence that has the texture of a dialogue (Ninio & Bruner 1978: 6). This dialogue, they suggested, ‘seems… to be a format well suited to the teaching of labelling’ (1978: 12). Subsequent research has also been interpreted as pointing to the teaching potential of joint picture-book reading (Wheeler 1983, Ninio 1983) and the opportunities it affords for situation-specific routines (Snow & Goldfield 1983).

The ‘root infinitive’ phenomenon in child speech is known from major languages such as Dutch. In this case study, a child acquiring the Papuan language Nungon in a remote village setting in Papua New Guinea uses two different non-finite verb forms as predicates of main clauses (‘root’ contexts) between ages 2;3 and 3;3. The first root non-finite form is an apparent innovation of the child, unacceptable in adult-to-adult speech, which must be learned from a special auxiliary construction in child-directed speech. The second root non-finite form functions like attested adult main clause use of the same form. During the study period, the first root non-finite form increases sharply to function as a default verb form, then decreases to nil by 3;2. The second increases gradually to near-adult levels. Both forms are non-finite and have similar proportions in the input. Thus, factors other than finiteness and frequency must explain their distributions.

Within developmental psychology, pointing gestures have received a great deal of attention, while ostensive gestures have been overlooked in terms of their emergence and intentionality. In a longitudinal and micro-genetic study with six children at 9, 11, and 13 months of age, we codified gesture production of children within second-by-second data frames. We identified 480 instances of gestures and categorised whether they were of ostensive, ostensive–indexical, or indexical nature. We specified the communicative function of each gesture by analysing the object involved and their circumstances of production. Data analysis include frequencies, binomial tests, proportion comparisons, and repeated measures ANOVA. We identified a phatic function in other-directed gestures, as well as exploratory and private functions in self-directed gestures. This has important implications for child development since ostensive gestures are easier to produce and to understand than pointing. The consideration of objects would be essential for defining the communicative function of gestures.

As written language contains more complex syntax than spoken language, exposure to written language provides opportunities for children to experience language input different from everyday speech. We investigated the distribution and nature of relative clauses in three large developmental corpora: one of child-directed speech (targeted at pre-schoolers) and two of text written for children – namely, picture books targeted at pre-schoolers for shared reading and children’s own reading books. Relative clauses were more common in both types of book language. Within text, relative clause usage increased with intended age, and was more frequent in nonfiction than fiction. The types of relative clause structures in text co-occurred with specific lexical properties, such as noun animacy and pronoun use. Book language provides unique access to grammar not easily encountered in speech. This has implications for the distributional lexical-syntactic features and associated discourse functions that children experience and, from this, consequences for language development.

This study examined a potential lexicality advantage in young children's early speech production: do children produce sound sequences less accurately in nonwords than real words? Children aged 3;3-4;4 completed two tasks: a real word repetition task and a corresponding nonword repetition task. Each of the 23 real words had a paired consonant-vowel sequence in the nonword in word-initial position (e.g., ‘su’ in [ˈsutkes] ‘suitcase’ and [ˈsudrɑs]). The word-initial consonant-vowel sequences were kept constant between the paired words. Previous work on this topic compared different sequences of paired sounds, making it hard to determine if those results were due to a lexical or phonetic effect. Our results show that children reliably produced consonant-vowel sequences in real words more accurately than nonwords. The effect was most pronounced in children with smaller receptive vocabularies. Together, these results reinforce theories arguing for interactions between vocabulary size and phonology in language development.

We explored the vocabulary and metaphor comprehension of learners of English as an additional language (EAL) in the first two years of UK primary school. EAL vocabulary knowledge is believed to be a crucial predictor of (reading) comprehension and educational attainment (Murphy, 2018). The vocabulary of five- to seven-year-old children with EAL was compared to that of English monolinguals (N = 80). Comprehension was assessed for both verbal (e.g., time flies) and nominal metaphors (be on cloud nine) of varying frequency. Results showed that children in year 2 (age six to seven years) had better comprehension than their younger (age five to six) peers, particularly for low-frequency metaphors. Children with EAL had weaker metaphor comprehension than their monolingual peers, particularly on a reasoning task. The results document how metaphor comprehension develops over the first critical years of schooling and indicates where learners with EAL differ from monolingual peers, thereby supporting targeted vocabulary teaching at primary schools.

The acquisition of the morphological rules for plural, agentive, and diminutive suffixes in Dutch was studied. Subjects included 7- and 12-year-old native speakers, and second-language learners in three age groups (5–10 years, 12–18 years, and adult). The first- and second-language learners showed very similar orders of acquisition for the rule systems governing plural and diminutive, but the second-language learners showed a subtle form of interference from their first language in acquiring the agentive. The findings suggest that morphological acquisition proceeds piecemeal, with the learning of specific word ending + allomorph sequences, and that generalizations at the level of morphological rules may not be made even after several years of correct performance with the allomorph in question.

This study investigates the phonological acquisition of Korean consonants using conversational speech samples collected from sixty monolingual typically developing Korean children aged two, three, and four years. Phonemic acquisition was examined for syllable-initial and syllable-final consonants. Results showed that Korean children acquired stops and nasals followed by affricates, fricatives, and the liquid. In general, Korean consonants were acquired earlier in syllable-initial position compared to syllable-final position, except for the liquid /l/. The findings are compared with previous research based on single-word assessments, and differences that appear to be associated with the unique morphological system of Korean are noted.

The goal of this research is to determine the relevant factors that aid in the acquisition of the perfective aspect in Russian. Results confirm the findings of previous research, which say that aspect is not learned as a uniform category, but rather interrelates with the acquisition of Aktionsarten. This study focuses on the factors responsible for the difference in the rate of the acquisition of two complementary Aktionsarten in the perfective aspect: telic verbs (verbs including a result/goal of the denoted event) and ingressive verbs (verbs including the beginning of the event).

Since the usage of Aktionsarten strongly depends on the surrounding discourse, two experiments that varied in their discourse complexity were conducted. One study looked at the production of isolated utterances (thirty-nine children aged 3;0 to 6;11) and the other study focused on complex texts (fifty-two children aged 3;0 to 6;11). It was found that while telics are used independently of discourse context, ingressives depend strongly on contextual information.

These results suggest that discourse complexity and narrative competence define the acquisitional process for ingressives, yet are irrelevant in the acquisition of telics.

Recent treatments of the optionality of sentence subjects in young-children's English have sought to link this phenomenon, and its eventual demise, to the development of the child's verb inflection system or to a parameter-resetting within the INFL (‘inflection’) constituent of the child's grammar. It is claimed that subject optionality disappears when these developments occur. The case-study reported here investigated the productive language of an English child between 2;5 and 3;0. It found that subjects were no longer optional at a stage when none of the reflexes of INFL claimed in the literature to be associated with the disappearance of subject optionality had yet been acquired. The possibility that subjects were present only when communicatively required was rejected. The frequency of subject realization of a Japanese child aged 3;0 was used to provide a measure of expected realization when subjects are not grammatically required. It is concluded that subject obligatoriness in English may be acquired as a characteristic of the language sui generis, independently of developments elsewhere in the child's emerging grammar.

The game of ‘talking backward’, invented independently by two boys aged 8; 10 and 9; 11, is studied with reference to the role of speech play in linguistic, cognitive, and social development. Case reports from 27 adult backward talkers suggest a lower limit of about 7 years for the onset of this ability. The backward speech of the two children illustrates how either phonology or orthography can be used as a basis for backward speech, and demonstrates the boys' knowledge of phonemic units and letter-to-sound correspondences. Talking backward belongs to a larger class of ‘secret’ language games that may be cognitively and pragmatically well suited to children of this age.

This paper examines the relationship between context and mothers' speech to prelinguistic infants. In the first phase, videorecordings of a mother talking with her infant were transcribed; in the second phase, 48 mothers were asked to select the utterance most apt for a series of drawings representing different contexts of mother–infant interaction. Data analyzed with respect to syntactic and semantic features revealed that the informational content of mothers' speech is different in relation to various contexts. Furthermore, different syntactic types are chosen in relation to different contents. Results are discussed in relation to a hypothesis assuming that mothers' speech is determined by particular interactive rules operating in the mother–infant dyad.

The ‘fis phenomenon’ and similar anecdotal evidence, which appears to give insight into child phonology, and also certain experiments designed to reveal the nature of homonymy in child language, are discussed with reference to an approach which distinguishes between eight different types of possible phonetic episode. It is concluded that the anecdotes and experiments are less instructive than is often supposed.

This study evaluated the development of vocabulary knowledge over the course of two academic years, beginning in preschool, in a large sample (N = 944) of language-minority children using scores from single-language vocabulary assessments and conceptual scores. Results indicated that although children began the study with higher raw scores for Spanish vocabulary knowledge than for English vocabulary knowledge, this was reversed by the end of the first year of the study. Similarly, at the beginning of the study unique Spanish vocabulary scores were larger than unique English or shared Spanish–English vocabulary scores; however, by the end of the first year of the study children's shared Spanish–English vocabulary scores were larger than unique English vocabulary scores, which were larger than unique Spanish vocabulary scores. These trends continued through the second year of the study. These results suggest that conceptual scoring is a useful assessment technique for children with limited exposure to their second language. Implications for assessment and instruction are discussed.

We investigated how bilinguals choose words in a narrative task, contrasting the possibilities of a developmental delay vs. compensatory strategies. To characterize a developmental delay, we compared younger (three to five years) and older (seven to ten years) children's lexicalization of target words (Study 1). The younger children told shorter stories, omitting many of the target concepts. To characterize compensatory strategies, we compared late second language learning adults to (seven- to ten-year-old) monolingual children (Study 2). The adults often lexicalized the target concepts even when not producing the target words. Finally, we compared French–English bilingual children with French and English monolinguals, all seven to ten years old (Study 3). The bilinguals produced fewer target words than the monolinguals. However, when not producing the target words, the bilinguals often lexicalized the concepts, sharing more in common with the adults (Study 2) in their use of compensatory strategies than with the younger children (Study 1). This interpretation was further corroborated by comparisons across studies (Study 4).

Monolingual children identify referents uniquely in gesture before they do so with words, and parents translate these gestures into words. Children benefit from these translations, acquiring the words that their parents translated earlier than the ones that are not translated. Are bilingual children as likely as monolingual children to identify referents uniquely in gesture; and do parental translations have the same positive impact on the vocabulary development of bilingual children? Our results showed that the bilingual children – dominant in English or in Spanish – were as likely as monolingual children to identify referents uniquely in gesture. More importantly, the unique gestures, when translated into words by the parents, were as likely to enter bilingual and monolingual children's speech – independent of language dominance. Our results suggest that parental response to child gesture plays as crucial of a role in the vocabulary development of bilingual children as it does in monolingual children.

We investigated whether Tagalog-speaking children incrementally interpret the first noun as the agent, even if verbal and nominal markers for assigning thematic roles are given early in Tagalog sentences. We asked five- and seven-year-old children and adult controls to select which of two pictures of reversible actions matched the sentence they heard, while their looks to the pictures were tracked. Accuracy and eye-tracking data showed that agent-initial sentences were easier to comprehend than patient-initial sentences, but the effect of word order was modulated by voice. Moreover, our eye-tracking data provided evidence that, by the first noun phrase, seven-year-old children looked more to the target in the agent-initial compared to the patient-initial conditions, but this word order advantage was no longer observed by the second noun phrase. The findings support language processing and acquisition models which emphasize the role of frequency in developing heuristic strategies (e.g., Chang, Dell, & Bock, 2006).