French native speakers in the making: From language-general to language-specific voicing boundaries

By examining voice onset time (VOT) discrimination in 4- and 8-month-olds raised in a French-speaking environment, the current study addresses the question of the role played by linguistic experience in the reshaping of the initial perceptual abilities. Results showed that the language-general −30- and +30-ms VOT boundaries are better discriminated than the 0-ms boundary in 4-month-olds, whereas 8-month-olds better discriminate the 0-ms boundary. These data support explanations of speech development stressing the effects of both language-general boundaries and linguistic environment (attunement theory and coupling theory). Results also suggest that the acquisition of the adult voicing boundary (at 0 ms VOT in French vs. +30 ms VOT in English) is faster and more linear in French than in English. This latter aspect of the results might be related to differences in the consistency of VOT distributions of voiced and voiceless stops between languages.     

Infant visual habituation

The use of visual habituation in the study of infant cognition and learning is reviewed. This article traces the history of the technique, underlying theory, and procedural variation in its measurement. In addition, we review empirical findings with respect to the cognitive processes that presumably contribute to habituation, studies of developmental course and long-term prediction, as well as recent attempts to address or explain the phenomenon of visual habituation through the use of mathematical or quantitative models. The review ends with an appeal for a return to the study of habituation per se as a valid measure of infant learning, rather than relegating the phenomenon to its use as a technique for familiarizing infants in procedures testing for discrimination or recognition.     

Cross-sectional study of coordination between infants' gaze and vocalizations towards their mothers

The study aimed at providing more precise information about infants' capacity to coordinate their vocalizations with gaze towards their mothers. A total of 32 infants were observed, four boys and four girls in each of four age groups (4, 6, 8 and 10 months), in an observational setting aimed at minimizing infants' casual looks to their mothers. Videotapes of mother-infant-toy interactions were coded separately for infants' vocalizations and gaze towards their mothers, and the difference between observed and expected cooccurrence of these two communicative behaviours was evaluated by transfromation into z-scores. Results indicate that only at 10 months of age do infants develop the ability to coordinate vocalizations and gazes towards mother. Moreover, more competent subjects show temporal relationships between gaze and vocalizations different from those observed in less competent subjects.     

Parental beliefs and practices concerning motor development: Testing new tools

The parental beliefs on motor development (PB-MD) and the motor habits (MOHAB) questionnaires are new instruments measuring parental beliefs, practices, infant MOHAB, and environmental features regarding motor development. Psychometric properties of these questionnaires were tested using data of parents of 268 Dutch and Israeli infants aged 1-to-8-months. Face- and convergent validity of both questionnaires, as well as internal consistency and test–retest reliability of the PB-MD were satisfactory. Exploratory factor analysis revealed five factors in the PB-MD. Altogether, both questionnaires are valid, reliable and culturally sensitive instruments potentially useful for research and clinical practice.     

Actors and actions: The role of agent behavior in infants' attribution of goals

Twelve-month-old infants attribute goals to both familiar, human agents and unfamiliar, non-human agents. They also attribute goal-directedness to both familiar actions and unfamiliar ones. Four conditions examined information 12-month-olds use to determine which actions of an unfamiliar agent are goal-directed. Infants who witnessed the agent interact contingently with a human confederate encoded the agent's actions as goal-directed; infants who saw a human confederate model an intentional stance toward the agent without the agent's participation, did not. Infants who witnessed the agent align itself with one of two potential targets before approaching that target encoded the approach as goal-directed; infants who did not observe the self-alignment did not encode the approach as goal-directed. A possible common underpinning of these two seemingly independent sources of information is discussed.     

The role of functional information for infant categorization

This report examines whether knowledge about function influences the formation of artifact categories in 11-12- month old infants. Using an object-examination task, a set of artificial stimuli was presented that could either be grouped according to overall similarity or according to similarity in one functionally relevant part. Experiment 1 revealed that infants categorized the objects according to overall similarity but not part similarity under control conditions. Experiment 2 showed that after having seen the experimenter demonstrating the functional use of the critical part, infants later categorized the stimuli according to part similarity. When the same actions were performed without producing any effect, infants failed to categorize according to the critical part. This set of findings suggests that 11-12-month old infants use functional information as a cue to categorization.     

Home improvements: Within-family associations between income and the quality of children's home environments

Within-family associations between changes in income and changes in the home environment during infancy and early childhood were examined using data from the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (n = 1364). Linear and nonlinear (i.e., semilog) specifications were estimated for family income. In addition, variations in income effects were estimated as a function of the level of developmentally stimulating resources in homes during early infancy. Increases in family income were positively associated with increases in the quality of children's home environments. The estimated effects of income were largest for families who had low incomes and low-quality early home environments. These results were evident for physical characteristics of the home that likely required monetary investments, as well as for psychosocial characteristics of the home.     

Foundations of attention sharing: Orienting and responding to attention in term and preterm 5-month-old infants

Attention is the gateway to perceptual, cognitive, and socioemotional development in humans. We observed 104 5-month-old term and preterm infants and their mothers in social interactions to address three questions about the role of maturation in orienting and responding to attention. We used a fine-grained coding system to allow parallel comparisons across infant and maternal orienting, and sequential analysis to evaluate infant and maternal responding to attention. Orienting and responding to attention differed for attention to people versus objects, as did the relations between maturity and attention. We conclude that maturity contributes to orienting and responding to attention and that orienting and responding to attention are specific rather than homogenous. We discuss the implications of these conclusions for future studies of how attention influences cognitive and communicative development.     

Social and individual factors modulate parent-infant interactions: Lessons from free play sessions in an Argentine sample

In this study, we aimed to explore the associations between socioeconomic status (SES) (i.e., parents’ education and occupation, quality of the home and overcrowding), temperament styles (i.e., surgency, negative emotionality and regulatory capacity) and early dyadic and triadic nonverbal communication behaviors. We recruited 60 mother-infant dyads (mean age: 10.89 months, range: 9–13 months) low-to-mid SES, and assessed the duration of their communication behaviors using the Bakeman and Adamson (1984); SES was measured using INDEC Scale (2001), and temperament was assessed using the Infant Behavior Questionnaire-Revised Very Short Form (IBQ-R VSF, Putnam et al., 2014). Results showed that SES and their subdimensions were positively associated with passive, coordinated joint engagement (coordinated attention to person and object) and surgency, and negative with infant passive observation. Also, there were positive correlations between negative emotionality and unengaged attention behavior. We conclude that SES contributed to parent-infant interactions and temperament style from early months of life. We interpret these findings in relation to early intervention approaches aimed at promoting cognitive and social development.     

Infant-directed language following a brief behavioral parenting intervention: The importance of language quality

Behavioral parenting interventions decrease early childhood behavior problems and increase positive parenting skills. However, few studies have examined the impact of low intensity interventions for infants at risk for behavior problems on changes in parent language. This study examined the effect of a brief parenting intervention, the Infant Behavior Program, on changes in parent linguistic input and its influence on infant language. Participants were 58 mothers and their12- to 15-month-olds, with elevated levels of behavioral problems. Mothers and their infants were from primarily Hispanic and low-income backgrounds. Mother-infant dyads were randomly assigned to receive the Infant Behavior Program or standard pediatric primary care. Mothers receiving the Infant Behavior Program provided more linguistic input, which indirectly influenced infant language, and suggest targeting infants at risk for behavior problems can have a broader impact on language development.