How do children develop the mapping between prosody and other levels of linguistic knowledge? This question has received considerable attention in child language research. In the present study two experiments were conducted to investigate four- to five-year-old Mandarin-speaking children's sensitivity to prosody in ambiguity resolution. Experiment 1 used eye-tracking to assess children's use of stress in resolving structural ambiguities. Experiment 2 took advantage of special properties of Mandarin to investigate whether children can use intonational cues to resolve ambiguities involving speech acts. The results of our experiments show that children's use of prosodic information in ambiguity resolution varies depending on the type of ambiguity involved. Children can use prosodic information more effectively to resolve speech act ambiguities than to resolve structural ambiguities. This finding suggests that the mapping between prosody and semantics/pragmatics in young children is better established than the mapping between prosody and syntax.

Mothers' verbal responses to their infants' spontaneous imitations of familiar and non-familiar words during naturally occurring interactions were examined in a longitudinal sample observed at 1 ; 1, 1 ; 5 and 1 ; 9. Maternal responses to both familiar and non-familiar imitations exhibited structural characteristics likely to be facilitative of early word learning, including shorter and single-word utterances and reproductions of imitated words in sentence-final position. Mothers also responded differentially to infants' non-familiar versus familiar imitations. Mothers produced more return imitations and more exact repetitions, providing an extra exemplar, following infants' imitations of non-familiar words. The familiar words infants imitated were more likely to receive the more complex expanded and reduced+expanded return imitations. Results suggest mothers' responses to infants' verbal imitations could serve as a mechanism for facilitating language acquisition.

Adult Spanish speakers generally know which form a determiner preceding a noun should have even if the noun is not in their lexicon, because Spanish demonstrates high predictability between determiner form and noun form (la noun-a and el noun-o). We asked whether young children learning Spanish are similarly sensitive to the correlation of determiner and noun forms, or whether they initially learn determiner–noun pairings one-by-one. Spanish–English bilingual children and adults repeated Spanish words and non-words preceded by gender congruous and incongruous determiners. If children learn determiner–noun pairings one-by-one, they should show a gender congruity effect only for words. In contrast with this prediction, both children and adults demonstrated congruity effects for words and non-words, indicating sensitivity to correlated morphophonological forms. Furthermore, both age groups showed more facility in producing phrases with nouns ending in -a, which are more frequent and predictable from the preceding determiner.

Pronouns seem to be acquired in an asymmetrical way, where children confuse the meaning of pronouns with reflexives up to the age of six, but not vice versa. Children's production of the same referential expressions is appropriate at the age of four. However, response-based tasks, the usual means to investigate child language comprehension, are very demanding given children's limited cognitive resources. Therefore, they might affect performance. To assess the impact of the task, we investigated learners of Dutch (three- and four-year-olds) using both eye-tracking, a non-demanding on-line method, and a typical response-based task. Eye-tracking results show an emerging ability to correctly comprehend pronouns at the age of four. A response-based task fails to indicate this ability across age groups, replicating results of earlier studies. Additionally, biases seem to influence the outcome of the response-based task. These results add new evidence to the ongoing debate of the asymmetrical acquisition of pronouns and reflexives and suggest that there is less of an asymmetry than previously assumed.

The effect of word-level variables on expressive phonology has not been widely studied, although the properties of words likely bear on the emergence of sound structure (Stoel-Gammon, 2011). Eight preschoolers, diagnosed with phonological delay, were assigned to treatment to experimentally induce gains in expressive phonology. Erred sounds were taught using stimulus words that varied orthogonally in neighborhood density and word frequency as the independent variables. Generalization was the dependent variable, defined as production accuracy of treated and untreated (erred) sounds. Blocked comparisons showed that dense neighborhoods triggered greater generalization, but frequency did not have a clear differential effect. Orthogonal comparisons revealed graded effects, with frequent words from dense neighborhoods being optimal for generalization. The results contrast with prior literature, which has reported a sparse neighborhood advantage for children with phonological delay. There is a suggestion that children with phonological delay require greater than usual cue redundancy and convergence to prompt expressive phonological learning.

The effect of neighborhood density on optional infinitives was evaluated for typically developing (TD) children and children with Specific Language Impairment (SLI). Forty children, twenty in each group, completed two production tasks that assessed third person singular production. Half of the sentences in each task presented a dense verb, and half presented a sparse verb. Children's third person singular accuracy was compared across dense and sparse verbs. Results showed that the TD group was significantly less likely to use optional infinitives with dense, rather than sparse verbs. In contrast, the distribution of optional infinitives for the SLI group was independent of verb neighborhood density. Follow-up analyses showed that the lack of neighborhood density effect for the SLI group could not be attributed to heterogeneous neighborhood density effects or floor effects. Results were interpreted within the Optional Infinitive/Extended Optional Infinitive accounts for typical language development and SLI for English-speaking children.

This study explores the development of children's knowledge of linguistic and pragmatic aspects of singular and plural in Italian, for definite articles (Experiment 1) and verbs (Experiment 2). Participants aged three to adult were asked to pick objects from two dishes, each with a different number of items on them (one vs. two), following the morphological information. Results show that children understand that singular forms refer to ‘one’ at about age four, whereas they understand that plural forms refer to ‘more than one’ when they are older than six. Moreover, children use singular and plural knowledge in appropriate relation with the referential context only when they are about six.

The present study investigates flexibility of verb use in the early stages of English multiword development, and its relationship with patterns attested in the input. The data is taken from a case study of a monolingual English-speaking boy aged 2 ; 5–2 ; 9 and his mother while engaged in daily activities in the home. Data were coded according to Halliday's (1975) functional system. The findings suggest that early multiword verb use is functionally restricted and closely tied to verb use in the input.

Using the Multiple Indicator Cluster Survey, language comprehension and production were compared in a sample of 101,250 children aged 2 ; 00 to 9 ; 11 and a focus subsample of 38,845 children aged 2 ; 00 to 4 ; 11 from sixteen under-researched developing nations. In the whole sample, comprehension slightly exceeded production; correlations between comprehension and production by country were positive and significant, but varied in size, and the average correlation was positive, significant, and small to medium. Mean comprehension and production varied with child age, reaching an asymptote at 5 ; 00, and correlations between comprehension and production by age were positive, significant, and similar at each age. In the focus subsample, comprehension exceeded production; correlations between comprehension and production by country were positive and significant, but varied in size, and the average correlation was positive, significant, and medium in size. Children in countries with lower standards of living were less likely to demonstrate basic language comprehension or production.