On a need-to-know basis: Young children distinguish conventional and privileged information.

Young children are biased to treat new information communicated to them as conventional, shareable, and known by others in their community. However, some information is privileged in the sense that is not intended to be shared with or known by all. The current study compared judgements regarding sharing conventional versus privileged information. Seventy-four 3- to 5-year-olds and adults responded to vignettes in which a protagonist had to decide whether to share conventional (an object name) or privileged information (surprise). Consistent with our hypothesis, there was no developmental change in sharing judgements for conventional information but a clear decrease with age for sharing privileged information. Nonetheless, even 3-year-olds were more likely to judge that conventional information should be shared more than privileged information, though this difference increased with age. While children overall treat information as shareable, there is an emerging ability to distinguish how conventional versus privileged information should be shared.

Child word learning in song and speech.

Listening to sung words rather than spoken words can facilitate word learning and memory in adults and school-aged children. To explore the development of this effect in young children, this study examined word learning (assessed as forming word-object associations) in 1- to 2-year olds and 3- to 4-year olds, and word long-term memory (LTM) in 4- to 5-year olds several days after the initial learning. In an intermodal preferential looking paradigm, children were taught a pair of words utilising adult-directed speech (ADS) and a pair of sung words. Word learning performance was better with sung words than with ADS words in 1- to 2-year olds (Experiments 1a and 1b), 3- to 4-year olds (Experiment 1a), and 4- to 5-year olds (Experiment 2b), revealing a benefit of song in word learning in all age ranges recruited. We also examined whether children successfully learned the words by comparing their performance against chance. The 1- to 2-year olds only learned sung words, but the 3- to 4-year olds learned both sung and ADS words, suggesting that the reliance on music features in word learning observed at ages 1-2 decreased with age. Furthermore, song facilitated the word mapping-recognition processes. Results on children's LTM performance showed that the 4- to 5-year olds' LTM performance did not differ between sung and ADS words. However, the 4- to 5-year olds reliably recalled sung words but not spoken words. The reliable LTM of sung words arose from hearing sung words during the initial learning rather than at test. Finally, the benefit of song on word learning and the reliable LTM of sung words observed at ages 3-5 cannot be explained as an attentional effect.

More than just accent? The role of dialect words in children's language-based social judgments.

Recent research suggests that young children are capable of distinguishing between phonetically dissimilar spoken accents yet have difficulty in distinguishing between phonetically similar accents. The current studies aimed to determine whether the presence of dialect-specific vocabulary enhances young children's ability to categorize speakers. In Study 1, 4- to 7-year-old children performed tasks in which they matched speakers based on the dialect-specific vocabulary the speakers used. Participants were successful in matching speakers based on vocabulary at a rate significantly greater than chance. In Study 2, participants performed a task in which they inferred a speaker's future dialect-specific vocabulary use based on the speaker's previous vocabulary use. Participants were able to infer a speaker's vocabulary use at a rate significantly greater than chance, and participants also showed social preference for and selective trust of speakers who used the participants' native dialect vocabulary over those who used a non-native dialect vocabulary. These interesting results suggest that when accent differences are too subtle for children to categorize speakers, dialect-specific vocabulary may enhance young children's ability to categorize a speaker. The results of preference and selective trust questions also suggest that children as young as 4 years use their knowledge of a speaker's vocabulary to guide their preferred social interactions, choosing to interact with others who speak similarly to them.

Song and infant-directed speech facilitate word learning.

Two separate lines of research have examined the influence of song and infant-directed speech (IDS-a speech register that includes some melodic features) on language learning, suggesting that the use of musical attributes in speech input can enhance language learning. However, the benefits of these two types of stimuli have never been directly compared. In this investigation, we compared the effects of song and IDS for immediate word learning and long-term memory of the learned words. This study examines whether the highly musical stimuli (i.e., song) would facilitate language learning more than the less musical stimuli (i.e., IDS). English-speaking adults were administered a word learning task, with Mandarin Chinese words presented in adult-directed speech (ADS), IDS, or song. Participants' word learning performance was assessed immediately after the word learning task (immediate word learning) and then 1 day later (long-term memory). Results showed that both song and IDS facilitated immediate word learning and long-term memory of the words; however, this facilitative effect did not differ between IDS and song, suggesting that the relationship between the degree of musicality and language learning performance is not linear. In addition, song and IDS were found to facilitate the word association process (mapping a label to its referent) rather than the word recognition process. Finally, participants' confidence in their answers might not differ among ADS, IDS, and sung words.

Monolingual and bilingual children's social preferences for monolingual and bilingual speakers.

Past research has shown that young monolingual children exhibit language-based social biases: they prefer native language to foreign language speakers. The current research investigated how children's language preferences are influenced by their own bilingualism and by a speaker's bilingualism. Monolingual and bilingual 4- to 6-year-olds heard pairs of adults (a monolingual and a bilingual, or two monolinguals) and chose the person with whom they wanted to be friends. Whether they were from a largely monolingual or a largely bilingual community, monolingual children preferred monolingual to bilingual speakers, and native language to foreign language speakers. In contrast, bilingual children showed similar affiliation with monolingual and bilingual speakers, as well as for monolingual speakers using their dominant versus non-dominant language. Exploratory analyses showed that individual bilinguals displayed idiosyncratic patterns of preference. These results reveal that language-based preferences emerge from a complex interaction of factors, including preference for in-group members, avoidance of out-group members, and characteristics of the child as they relate to the status of the languages within the community. Moreover, these results have implications for bilingual children's social acceptance by their peers.

Two-year-olds differentially disambiguate novel words and facts.

When presented with a pair of objects, one familiar and one unfamiliar, and asked to select the referent of a novel word, children reliably demonstrate the disambiguation effect and select the unfamiliar object. The current study investigated two competing word learning accounts of this effect: a pragmatic account and a word learning principles account. Two-, three- and four-year-olds were presented with four disambiguation conditions, a word/word, a word/fact, a fact/word and a fact/fact condition. A pragmatic account predicted disambiguation in all four conditions while a word learning principles account predicted disambiguation in the word/word and fact/word conditions. Results indicated that children disambiguated in word/word and fact/word conditions and two-year-olds disambiguated at above chance levels in the word/word condition but at BELOW chance levels in the fact/fact condition. Because disambiguation varied both as a function of age and condition these findings are presented as challenges to a pragmatic account of the disambiguation effect.