Infant contributions to joint attention predict vocabulary development

Joint attention has long been accepted as constituting a privileged circumstance in which word learning prospers. Consequently research has investigated the role that maternal responsiveness to infant attention plays in predicting language outcomes. However there has been a recent expansion in research implicating similar predictive effects from individual differences in infant behaviours. Emerging from the foundations of such work comes an interesting question: do the relative contributions of the mother and infant to joint attention episodes impact upon language learning? In an attempt to address this, two joint attention behaviours were assessed as predictors of vocabulary attainment (as measured by OCDI Production Scores). These predictors were: mothers encouraging attention to an object given their infant was already attending to an object (maternal follow-in); and infants looking to an object given their mothers encouragement of attention to an object (infant follow-in). In a sample of 14-month old children (N=36) we compared the predictive power of these maternal and infant follow-in variables on concurrent and later language performance. Results using Growth Curve Analysis provided evidence that while both maternal follow-in and infant follow-in variables contributed to production scores, infant follow-in was a stronger predictor. Consequently it does appear to matter whose final contribution establishes joint attention episodes. Infants who more often follow-in into their mothers’ encouragement of attention have larger, and faster growing vocabularies between 14 and 18-months of age

Gaze following, gaze reading, and word learning in children at-risk for autism

We investigated gaze following abilities as a prerequisite for word learning, in a population expected to manifest a wide range of individual variability – children with a family history of autism. Three-year-olds with or without a family history of autism took part in a word-learning task that required following gaze to find the correct referent of a novel word. Using an eye-tracker to monitor children’s gaze behavior we show that the ability to follow an adult’s gaze was necessary but not sufficient for successful word learning. Those children that had poor social and communicative skills could follow gaze to the correct object, but did not then learn the word associated with that object. These findings shed light on the conditions that lead to successful or less successful word learning in typical and atypical populations

Separable Attentional Predictors of Language Outcome

This is the peer reviewed version of the following article: Salley, B., Panneton, R. K. and Colombo, J. (2013), Separable Attentional Predictors of Language Outcome. Infancy, 18: 462–489. doi:10.1111/j.1532-7078.2012.00138.x, which has been published in final form at http://doi.org/10.1111/j.1532-7078.2012.00138.x. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.The aim of this study was to examine the combined influences of infants attention and use of social cues in the prediction of their language outcomes. This longitudinal study measured infants' visual attention on a distractibility task (11 months), joint attention (14 months), and language outcomes (word –object association, 14 months; MBCDI vocabulary size and multi-word productions at 18 months of age). Path analyses were conducted for two different language outcomes. The analysis for vocabulary revealed unique direct prediction from infants' visual attention on a distractibility task (i.e., maintaining attention to a target event in the presence of competing events) and joint attention (i.e., more frequent response to tester's bids for attention) for larger vocabulary size at outcome; this model accounted for 48% of variance in vocabulary, after controlling for baseline communication status (assessed at 11 months). The analysis for multi-word productions yielded direct effects for infants' distractibility, but not joint attention; this model accounted for 45% of variance in multi-word productions, again after controlling for baseline communication status. Indirect effects were not significant in either model. Results are discussed in light of the unique predictive role of attentional factors and social/attention cues for emerging language

Computational and Robotic Models of Early Language Development: A Review

We review computational and robotics models of early language learning and development. We first explain why and how these models are used to understand better how children learn language. We argue that they provide concrete theories of language learning as a complex dynamic system, complementing traditional methods in psychology and linguistics. We review different modeling formalisms, grounded in techniques from machine learning and artificial intelligence such as Bayesian and neural network approaches. We then discuss their role in understanding several key mechanisms of language development: cross-situational statistical learning, embodiment, situated social interaction, intrinsically motivated learning, and cultural evolution. We conclude by discussing future challenges for research, including modeling of large-scale empirical data about language acquisition in real-world environments. Keywords: Early language learning, Computational and robotic models, machine learning, development, embodiment, social interaction, intrinsic motivation, self-organization, dynamical systems, complexity.Comment: to appear in International Handbook on Language Development, ed. J. Horst and J. von Koss Torkildsen, Routledg

Developmental pathways to autism: a review of prospective studies of infants at risk

Autism Spectrum Disorders (ASDs) are neurodevelopmental disorders characterized by impairments in social interaction and communication, and the presence of restrictive and repetitive behaviors. Symptoms of ASD likely emerge from a complex interaction between pre-existing neurodevelopmental vulnerabilities and the child's environment, modified by compensatory skills and protective factors. Prospective studies of infants at high familial risk for ASD (who have an older sibling with a diagnosis) are beginning to characterize these developmental pathways to the emergence of clinical symptoms. Here, we review the range of behavioral and neurocognitive markers for later ASD that have been identified in high-risk infants in the first years of life. We discuss theoretical implications of emerging patterns, and identify key directions for future work, including potential resolutions to several methodological challenges for the field. Mapping how ASD unfolds from birth is critical to our understanding of the developmental mechanisms underlying this disorder. A more nuanced understanding of developmental pathways to ASD will help us not only to identify children who need early intervention, but also to improve the range of interventions available to them

Expressive vocabulary predicts non-verbal executive function: a 2-year longitudinal study of deaf and hearing children

Numerous studies suggest an association between language and executive function (EF), but evidence of a developmental relationship remains inconclusive. Data were collected from 75 deaf/hard-of-hearing (DHH) children and 82 hearing age-matched controls. Children were 6-11 years old at first time of testing, and completed a battery of nonverbal EF tasks and a test of expressive vocabulary. These tasks were completed again two years later. Both groups improved their scores on all tasks over this period. DHH children performed significantly less well than hearing peers on some EF tasks and the vocabulary test at both time points. Cross-lagged panel models showed that vocabulary at Time 1 predicted change in EF scores for both DHH and hearing children but not the reverse

Associations among Family Environment, Attention, and School Readiness for At-Risk Children

This study examined the developmental pathways from children’s family environment to school readiness within an at-risk sample (N = 1,701). Measures of the family environment (maternal parenting behaviors and maternal mental health) across early childhood were related to children’s observed sustained attention as well as to academic and behavioral outcomes at age 5 years. Results suggest specificity in the associations among attention and its correlates. Maternal parenting behaviors but not mental health explained individual differences in sustained attention, which in turn were associated with variability in children’s academic school readiness. Mediation tests confirmed that sustained attention partially accounted for the link between parenting behaviors and academic school readiness. While maternal mental health was associated with children’s behavioral school readiness, sustained attention did not play a mediating role. Findings indicate sustained attention as a potential target for efforts aimed at enhancing academic school readiness among predominantly poor and minority children.child development, educational success, parenting behaviors, school readiness, mental health

Does Joint Attention Mediate the Relationship between Temperament and Language?

Individual differences in child temperament have been associated with individual differences in language development; similarly, relationships have been separately reported among temperament, language and early nonverbal social communication (joint attention). The present study examined the relationship between temperament and language, in the context of joint attention as an underlying developmental variable mediating this association. Temperament, language and joint attention were assessed in 51 Appalachian 21-month-old toddlers. Results indicate a relationship between aspects of temperamental difficulty, including low executive control and high negative affect, and low language. A relationship was also found between temperament and joint attention, such that aspects of high negative affect were predictive of less frequent joint attention engagement. No association was found between joint attention and language at 21 months. Therefore in general, the utility for a model of joint attention as a mediating variable in the relationship between temperament and language was not substantiated

Intersubjectivity as a precursor to literacy : revisiting the home-school study of language and literacy development

The oral language skills children develop during the first five years of life are crucial to success in school, especially within the literacy domain. Researchers have identified aspects of oral language that predict, transfer to, or map onto children’s later written language abilities. Many researchers studying this topic have taken a social interaction approach by seeking to investigate ways in which early language interactions relate to children’s later literacy skills. In quantitative studies, however, this has primarily been done by simply including measures of caregiver talk as independent variables in analyses. By doing this, such studies effectively only measure language input rather than language interaction, thus undermining the sociocultural framework on which they are based. Sociocultural theory reasons that co-constructed meaning is greater than (and may be qualitatively distinct from) the sum of its parts. This study offers a method to overcome this measurement problem by showing how intersubjectivity can be measured to capture qualities of co-constructed meaning within language interactions. Data from the Home-School Study of Language and Literacy Development were reanalyzed by coding aspects of caregiver-child intersubjectivity. These intersubjective measures were quantified and entered into three separate regression models to test the predictability of parent-child joint meaning-making on children’s later reading scores. Results revealed positive, significant relationships between early parent-child language interactions and children’s literacy scores in first grade, thus adding to the knowledge base of the oral language-to-literacy connection and providing empirical support for this new method of quantifying language variables in social interaction studies.Educational Psycholog