Where’s the Advantage? Mutual Exclusivity Promotes Children’s Initial Mapping, but Not Long-Term Memory, for Words Compared to Other Strategies

Children frequently apply a novel label to a novel object, a behavior known as the mutual exclusivity bias (MEB). This study examined how MEB affects children’s retention for word mappings. In Experiment 1, preschoolers (N = 39; Mage = 46.62 months) and adults (N = 24; Mage = 21.63 years) completed an immediate word mapping task and a delayed retention test. Both samples used MEB during referent selection, but neither group displayed higher retention for words mapped via MEB than words mapped via other referent selection strategies at test. Experiment 2 replicated Experiment 1 with preschoolers (N = 85; Mage = 47.78 months) and provided evidence against the possibility that interference from multiple words contributed to children’s faster forgetting of word mappings when using MEB. Experiment 3 presented children (N = 30; Mage = 51.13 months) with an abbreviated version of the task, providing evidence against the alternative hypothesis that cognitive load during learning caused the forgetting observed in Experiments 1 and 2. Taken together, these experiments suggest that MEB supports initial word mapping but may not provide an advantage for long-term retention.

Investigating the Mechanisms Driving Referent Selection and Retention in Toddlers at Typical and Elevated Likelihood for Autism Spectrum Disorder

It was suggested that children's referent selection may not lay memory traces sufficiently strong to lead to retention of new word-object mappings. If this was the case we expect incorrect selections to be easily rectified through feedback. Previous work suggested this to be the case in toddlers at typical likelihood (TL) but not in those at elevated likelihood (EL) for autism spectrum disorder (ASD) (Bedford et al., 2013). Yet group differences in lexical knowledge may have confounded these findings. Here, TL (N = 29) and EL toddlers (N = 75) chose one of two unfamiliar objects as a referent for a new word. Both groups retained the word-referent mapping above chance when their choices were immediately reinforced but were at chance after corrective feedback. The same pattern of results was obtained when children observed another experimenter make the initial referent choice. Thus, children's referent choices lay memory traces that compete with subsequent correction; these strong word-object associations are not a result of children actively choosing potential referents for new words.

Overspecification and incremental referential processing: An eye-tracking study

Using eye-tracking, we examined if over-specification hinders or facilitates referent selection, and the extent to which this depends on the properties of the attribute mentioned in the referring expressions and the underpinning processing mode. Following spoken instructions, participants selected the referent in a visual display while their eye movements were monitored. The referring expressions were presented either simultaneously with the displays, so the attributes could be incrementally processed in sequence, or before the display presentation, so the attributes could be processed in parallel from the outset of search. Experiment 1 showed that when the attributes were processed incrementally, how quickly an earlier-mentioned attribute discriminated determined whether a late-mentioned, over-specified attribute contributed to discrimination: When color was mentioned first and is fully discriminating, the referent was selected fast regardless of the second-mentioned pattern, whereas when pattern was mentioned first and is fully discriminating, the second-mentioned color facilitated discrimination. Experiment 2 found that under incremental processing, color mention after a fully discriminating pattern increased fixations but delayed referent selection relative to a pattern-only description; under parallel processing, however, color mention immediately eliminated alternatives and sped up referent selection. Experiment 3 showed that pattern mention after a fully discriminating color delayed referent selection and tended to reduce fixations relative to a color-only description in both processing modes. Hence, additional attributes can speed up referent selection but only when they can discriminate much faster than alternative attributes mentioned in a more concise description, and critically, when they can be used early for referent search.

The effect of the number of labeled objects on novel referent selection across short and long time delays

Children often hear many new words in one conversation, and yet word learning research overwhelmingly focuses on how children learn and retrieve the meanings of single words. The current experiment tests how the number of labeled objects affects preschoolers’ novel word referent selection immediately after encoding and after a one-week delay. Seventy 3- to 6-year-olds were exposed to four novel objects. Half of the participants were given novel labels for two of the objects and half were given novel labels for all four. Label-referent mapping was tested with a four alternative forced-choice pointing task both immediately after exposure and one week later. Children performed worse overall after a week delay, replicating past work on novel word retention. While children performed significantly worse overall in the Four-Label condition, exploratory analyses revealed that this effect was driven solely by the second test trial immediately after exposure. Analyses suggest that referent selection is strongly influenced by in-the-moment constraints, such as label salience and pragmatic biases, and that these constraints are strongest immediately after novel word exposure.

Resolving pronominal reference in local contexts: a referent selection task

Studies on global and local discourse have shown that sign languages indeed allow for occurrence of referentially unanchored pronominal index (ıx) signs referring to non-present antecedents to appear in ambiguous contexts. In local contexts, resolving the reference of these expressions has been suggested to either depend on a modality-specific anaphora resolution mechanism (localization) or on the next mention bias (first/second mention preference) influencing the salience of the referents. This paper presents a two-alternative forced choice referent selection task investigating the impact of a default localization pattern on the interpretation of referentially unanchored pronominal ix sign, in the local discourse with two competing antecedents. To do that, comparative response data was collected from right- and left-handed signers of German Sign Language (DGS) and Turkish Sign Language (TİD). Results provide evidence for second-mention or object preference for pronominal ix in both languages. In addition, the default localization pattern is identified only in restricted environments (i.e., with reciprocal verbs) to resolve pronominal reference. This modality-specific means is shown to be subject to variation across two unrelated sign languages under investigation. -----------------------------------------------------------------------------RESOLVENDO A REFERÊNCIA PRONOMINAL EM CONTEXTOS LOCAIS: UMA TAREFA DE SELEÇÃO DE REFERENTESEstudos existentes sobre discursos globais e locais mostram que as línguas de sinais claramente permitem que os sinais de apontação (ıx) pronominais referenciais não-ancorados referindo-se a antecedentes ausentes possam ocorrer em contextos ambíguos. Em contextos locais, sugere-se que a resolução da referência dessas expressões dependeriam tanto de um mecanismo de resolução anafórica específico da modalidade visual (localização), bem como de uma tendência de que a próxima menção (uma preferência pela primeira/segunda menção) influenciasse na saliência dos referentes que serão retomados. Este artigo apresenta uma tarefa de seleção de referentes feita obrigatoriamente a partir de duas alternativas que teve por objetivo investigar o impacto do padrão de localização default na interpretação do sinal de apontação pronominal referencial não-ancorado no discurso local, tendo como competidores, dois potenciais antecedentes. Para realizar tal tarefa, comparamos os dados obtidos das respostas de sinalizadores destros e canhotos da Língua de Sinais Alemã (DGS) e da Língua de Sinais Turca (TİD). Os resultados evidenciam que ıx pronominal retoma preferencialmente o segundo referente mencionado ou o objeto em ambas as línguas. Ainda, identificamos que o padrão de localização default só resolve a referência pronominal em ambientes restritos (ex: com verbos recíprocos). Mostramos que este modo de resolver a referência pronominal é específico da modalidade visual e está sujeito à variação paramétrica nas duas línguas de sinais investigadas, que não possuem relação de familiaridade.---Original em inglês.

Patterns of Mutual Exclusivity and Retention: A Study of Monolingual and Bilingual 2-Year-Olds

When children learn their native language, they tend to treat objects as if they only have one label—a principle known as mutual exclusivity (ME). However, bilingual children are faced with a different cognitive challenge—they need to learn to associate two labels with one object. In the present study, we compared bilingual and monolingual 24-month-olds' performance on a challenging and semi-naturalistic forced-choice referent selection task and retention test. Overall, both language groups used ME at similar rates but differed on retention. Specifically, while monolingual infants showed some retention, bilingual infants performed at chance and significantly worse than their monolingual peers.

Adaptation to an Unfamiliar Accent by Child L2 Listeners

The study examines school-aged L2 listeners’ adaptation to an unfamiliar L2 accent and learner variables predicting such adaptation. Fourth-grade Mandarin L1 learners of English as a foreign language ( N = 117) listened to a story twice in one of three accent conditions. In the single-talker condition, the story was produced by an Indian English (IE) speaker. In the multi-talker condition, the story was produced by two IE speakers. In the control condition, the story was produced by a Mandarin-accented speaker. Children’s (re)interpretation of IE words/nonwords was assessed by referent selection tests administered before and after the first and the second exposures to the story. Repeated exposure to IE-accented speech forms influenced performance: the participants demonstrated better recognition of IE words across the referent selection tests but worse (re)interpretation of IE nonwords sounding similar to existing lexical items. Exposure to an IE-accented story yielded an additional advantage in word recognition, but the advantage was limited to words heard in the story. Furthermore, children’s English phonological awareness, phonological memory, and vocabulary predicted their reinterpretation performance of the accented forms. These results suggest that school-aged L2 listeners with better phono-lexical representations develop better capacity in adapting to an unfamiliar accent of a foreign language by loosening their acceptability criteria for word recognition but the adaptation does not necessarily entail perceptual tuning to the specific phonological categories of the accent.

Quantifying the Effects of Background Speech Babble on Preschool Children's Novel Word Learning in a Multisession Paradigm: A Preliminary Study

Purpose This study tested the effects of background speech babble on novel word learning in preschool children with a multisession paradigm. Method Eight 3-year-old children were exposed to a total of 8 novel word–object pairs across 2 story books presented digitally. Each story contained 4 novel consonant–vowel–consonant nonwords. Children were exposed to both stories, one in quiet and one in the presence of 4-talker babble presented at 0-dB signal-to-noise ratio. After each story, children's learning was tested with a referent selection task and a verbal recall (naming) task. Children were exposed to and tested on the novel word–object pairs on 5 separate days within a 2-week span. Results A significant main effect of session was found for both referent selection and verbal recall. There was also a significant main effect of exposure condition on referent selection performance, with more referents correctly selected for word–object pairs that were presented in quiet compared to pairs presented in speech babble. Finally, children's verbal recall of novel words was statistically better than baseline performance (i.e., 0%) on Sessions 3–5 for words exposed in quiet, but only on Session 5 for words exposed in speech babble. Conclusions These findings suggest that background speech babble at 0-dB signal-to-noise ratio disrupts novel word learning in preschool-age children. As a result, children may need more time and more exposures of a novel word before they can recognize or verbally recall it.