Sentences with a plural subject receive a distributive reading if the predicate refers to the atomic members, or a collective one if it relates to the whole group. Previous accounts suggest that the distributive representation includes an additional semantic operator, and comprehension experiments show that adults interpret an ambiguous sentence as collective. However, children accept distributive readings more frequently, questioning their presumed greater difficulty. The current study investigates these interpretations in a novel way through a production study, where Italian adults and preschoolers described distributive and collective pictures. Adults produced more distributive expressions, in line with semantic theories and psycholinguistic findings. Preschoolers, however, showed limited sensitivity to the need for disambiguating markers, showing in particular that knowledge of distributive quantifiers is not fully acquired by the age of five, at least in the production domain. We discuss our results at the intersection of language acquisition, semantic theories, and cognitive development.

This study explores the relationships among socioeconomic status (SES), executive function (EF), grammar comprehension (GC), and pragmatic language (PL) in children aged 8–11. By employing a structural equation modelling approach, we aimed to investigate the direct and indirect effects of these variables on PL, a crucial aspect of child development involved in the formation of social relationships and general well-being. Our final sample consisted of 128 children from a heterogeneous socioeconomic context. Participants were assessed using the APL Medea, TROG-2, and TeleFE tests to measure their PL, GC, and EF, respectively. The findings reveal that GC and EF are important predictors of PL, with GC playing an important role in mediating the effects of SES. In conclusion, this study highlights the key role of GC in connecting SES and PL, with strong practical implications for the interventions aimed at mitigating the adverse effects of socioeconomic factors.

We present the typological approach to child language research. The typological approach places language diversity at the centre of acquisition research, thereby limiting arbitrary adjustments to theory and practice. We apply the typological approach to Ingram’s (2002) measures of whole-word phonological complexity (PMLU) and proximity (PWP). Our generalised PMLUg measure takes into account crosslinguistic variation in word status, including complex predicates and words without vowels. We analysed conversational data from Dutch, English, Japanese, Portuguese, Spanish, and Xi’iùy to determine whether two-year-old children target and produce words with significant between-language differences in phonological complexity. We found significant between-language differences in PMLUg for the target and produced words, but not PWPg. Comparing the complexity of the children’s words with the complexity of target words reveals their growth potentials along the syllable and consonant dimensions. Our study begins the cumulative investigation of the features that determine whole-word phonological complexity and proximity crosslinguistically.

While a role of language in the development of Theory of Mind (ToM) is well established, the interplay with a child’s ability to understand structured scenarios remains unclear. A new scale (Pictorial Theory of Mind Scale), assessing true and false belief comprehension at different levels of linguistic complexity, was used to explore language effects on ToM while accounting for scenario comprehension. Thirty-nine children (aged 4–6 years; 53.8% female) participated in this study. Results showed that 46.8% of 4- to 6-year-olds can understand false beliefs from picture-based scenarios with limited language output. Both language and scenario comprehension contributed to ToM in first-order false beliefs, whereas only scenario comprehension predicted true beliefs. In contrast, only language predicted second-order false beliefs, highlighting their different roles in ToM development.

The current study characterized voice onset time (VOT) and vowel onset fundamental frequency (F0) in the production of three Vietnamese alveolar stops (i.e. /t̪ʰ/, /t/, and /d/) by monolingual Vietnamese children and adults. Eighty Vietnamese children aged 3–7 years and 16 adults aged 22–44 years participated in this study. Unlike speakers of other languages with a three-way voicing contrast, Vietnamese children were able to produce distinct categories for the three Vietnamese stop categories by 3 years of age. However, differences in vowel onset F0 among the three voicing categories were not significant in any age group. These findings enhance our understanding of how Vietnamese children acquire three-way voicing contrast in stop production and offer broader insights into stop consonant acquisition across languages.

Recent research has shown that 6-month-olds relate novel words suffixed with -s, like babs, that are embedded in passages, with just the stem bab, demonstrating an early sensitivity to morphological relatedness. This study builds on these findings by investigating the role of allomorphy in early morphological acquisition. We tested whether infants relate novel words suffixed with [-z] and [-s] allomorphs of the -s suffix and their stems. We find that English-learning 6-month-olds relate novel words suffixed with the [-z], but not [-s], allomorph with stems, providing evidence for an acquisition trajectory where infants discover morphemes one allomorph at a time.

This study piloted CHIPUTIL, an automated tool in CLAN for analysing sequential lexical overlap in parent–child conversations. In a sample of 44 dyads (child age M = 1;9), child spontaneous lexical overlap was positively associated with parent imitations and expansions, across the conversation and within sequential turns. Children were more than twice as likely to respond with lexical overlap when parents first produced an imitation or expansion. These findings offer insight into how lexical overlap may unfold in early conversations. We discuss implications of automated coding and future directions in exploring the role of lexical overlap in children’s language development.

A growing literature explores the representational detail of infants’ early lexical representations, but no study has investigated how exposure to real-life acoustic-phonetic variation impacts these representations. Indeed, previous experimental work with young infants has largely ignored the impact of accent exposure on lexical development. We ask how routine exposure to accent variation affects 6-month-olds’ ability to detect mispronunciations. Forty-eight monolingual English-learning 6-month-olds participated. Mono-accented infants, exposed to minimal accent variation, detected vowel mispronunciations in their own name. Multi-accented infants, exposed to high levels of accent variation, did not. Accent exposure impacts speech processing at the earliest stages of lexical acquisition.

Deaf and hard-of-hearing (DHH) preschoolers have difficulty comprehending and producing English plural morphology. This study investigated their comprehension and production of the plural at primary-school age using novel words, to better understand their mental representation of plural morphology. Thirty 5- to 9-year-old DHH children and 31 children with normal hearing (NH) completed a two-alternative forced-choice comprehension task and a wug production task. Performance was not significantly poorer for DHH children, though some morphophonological contexts proved challenging for both groups. Performance was correlated with vocabulary size. This suggests that, if DHH children have sufficient vocabulary, they may perform like primary school NH peers in plural comprehension and production.

We present a new corpus of child and child-directed speech (CDS) in Palestinian Arabic. It includes transcriptions following the CHILDES guidelines and features recordings of 16 monolingual Palestinian Arabic-speaking children with an age range of 19–58 months and their adult interlocutors. We analyse the children’s morphosyntactic development and identify a variety of target word orders (45 in child speech, 50 in CDS), with prevalent SV(O) structures; we also found high rates of null subjects in both populations, marginal errors in children’s verbal agreement morphology, and early emergence of serial verb constructions, observed from 23 months of age.

This study assessed the association between home learning environment (HLE) at 3 years of age and children’s concurrent and longitudinal vocabulary skills. HLE consisted of the following activities done with primary caregivers: storytelling, drawing, music, toys and games, everyday home activities, playing outdoors, and reading. Results demonstrated that a higher HLE score at 3 years was concurrently related to higher expressive vocabulary and grammar scores, and longitudinally to higher receptive language scores from 5 to 9 years of age. Taken together, these findings suggest that children’s HLE represents a significant contributor to children’s concurrent and longitudinal language skills.

We examined the direct and indirect associations between home literacy environment (HLE) and children’s listening comprehension and word reading in Chinese. Three hundred forty-seven Chinese kindergarten children (mean age = 74.01 months, 50% female) were tested on measures of pinyin letter knowledge, phonological awareness, vocabulary, word reading, and listening comprehension. Their parents completed a questionnaire about their socioeconomic status and the three aspects of HLE (code-related and meaning-related HLE, access to literacy resources). Results of path analysis showed that access to literacy resources was indirectly associated with both listening comprehension and word reading through the effects of phonological awareness and vocabulary. These findings suggest that in the early phases of language and literacy development, print materials in the home may be important not only for written-language skills but also for oral-language skills.

The present study examines whether presenting words in song versus spoken sentences can lead to differences in word learning in 47–50-month-old children. This work extends previous findings on this topic and evaluates whether the location of pitch changes within the song may contribute to how well the words are learned. Using a Preferential Looking Paradigm, 32 children were taught the names of objects, either in spoken sentences or in a song that followed an unfamiliar melody. In both conditions, the novel word was emphasized by a pitch change. Looking patterns indicated that children learned the names of the novel items better when the words were trained in the spoken sentence compared to the song condition. The findings are discussed in relation to theories of word learning, and how differences in the characteristics between speech and song may relate to variability in how well new words are acquired.

Recent evidence from cross-situational learning (CSL) studies have shown that adult learners can acquire words and grammar simultaneously when sentences of the novel language co-occur with dynamic scenes to which they refer. Syntactic bootstrapping accounts suggest that grammatical knowledge may help scaffold vocabulary acquisition by constraining possible meanings, thus, for children, words and grammar may be acquired at different rates. Twenty children (ages 8 to 9) were exposed in a CSSL study to an artificial language comprising nouns, verbs, and case markers occurring within a verb-final grammatical structure. Children acquired syntax (i.e., word order) effectively, but we found no evidence of vocabulary learning, whereas previous adult studies showed learning of both from similar input. Grammatical information may thus be available early for children, to help constrain and support later vocabulary learning. We propose that gradual maturation of declarative memory systems may result in more effective vocabulary learning in adults.