Marriage, Parenting, and the Emergence of Early Self-Regulation in the Family System

The early years of toddlerhood mark the emergence of self-regulation and the child's ability to comply with parental requests. The current study examined young children's compliance and noncompliance in a family context by observing mothers, fathers, and two children in a family clean-up paradigm. Marital conflict and mutual responsiveness in the parent-child relationship were used as predictors of children's early self-regulation in an effort to explore risk and protective factors within the family. Several interactions between mother and father behavior as well as between marital conflict and parenting revealed how father-infant attachment moderates the effects of mother-infant attachment on children's compliance and how a close father-child relationship can protect children from the risks associated with high levels of marital conflict. Results indicate that future research on children's early self-regulation needs to be more systemic and move beyond the traditional mother-child dyadic context.     

The mediating role of joint attention in the relationship between motor skills and receptive and expressive language in siblings at risk for autism spectrum disorder

Language problems are highly prevalent in younger siblings of children with autism spectrum disorder (HR-sibs), yet little is known about early predictors. There is growing evidence that motor and language development are linked and this connection might be mediated by joint attention. Developmental changes in motor abilities change how children interact with objects and people (e.g., by showing), which may influence language development. This association has however not yet been studied in HR-sibs. The interrelationship between motor, joint attention and language skills was explored in younger siblings of typically developing children (LR-sibs, N = 31) and HR-sibs (N = 32). In both groups, motor skills (composite of fine and gross motor skills) at 10 months influenced receptive and expressive language at 36 months directly and indirectly through joint attention at 14 months. Group status moderated this direct and indirect effect with mainly significant effects in HR-sibs. This indicates that lower motor skills can have cascading effects on joint attention and language in HR-sibs. Consequently, assessment of early motor skills in HR-sibs might hold promise for early identification of motor difficulties but can also be indicative of language difficulties later in life, especially when difficulties with joint attention are also present.     

Older siblings influence younger siblings' motor development

Evidence exists for two competing theories about the effects of having an older sibling on development. Previous research has found that having an older sibling has both advantages and disadvantages for younger siblings' development. This study examined whether and how older siblings influenced the onset of their own younger siblings' motor milestones, a heretofore unstudied developmental domain in the sibling literature. Parents of 51 sibling pairs reported their children's crawling and walking onset dates. In keeping with imitation theories, in families where younger siblings crawled or walked earlier than their own older sibling, they did so significantly earlier. Moreover, in keeping with limited parental resource theories, in families where older siblings crawled or walked earlier than their own younger sibling, they did so significantly earlier. Older siblings did influence younger siblings' motor development, but how they did so may have depended on unique family characteristics. Copyright © 2008 John Wiley & Sons, Ltd.     

Leveraging epigenetics to examine differences in developmental trajectories of social attention: A proof-of-principle study of DNA methylation in infants with older siblings with autism

Preliminary evidence suggests that changes in DNA methylation, a widely studied epigenetic mechanism, contribute to the etiology of Autism Spectrum Disorder (ASD). However, data is primarily derived from post-mortem brain samples or peripheral tissue from adults. Deep-phenotyped longitudinal infant cohorts are essential to understand how epigenetic modifications relate to early developmental trajectories and emergence of ASD symptoms. We present a proof-of-principle study designed to evaluate the potential of prospective epigenetic studies of infant siblings of children with ASD.Illumina genome-wide 450 K DNA methylation data from buccal swabs was generated for 63 male infants at multiple time-points from 8 months to 2 years of age (total N = 107 samples). 11 of those infants received a diagnosis of ASD at 3 years. We conducted a series of analyses to characterize DNA methylation signatures associated with categorical outcome and neurocognitive measures from parent-report questionnaire, eye-tracking and electro-encephalography.Effects observed across the entire genome (epigenome-wide association analyses) suggest that collecting DNA methylation samples within infant-sibling designs allows for the detection of meaningful signals with smaller sample sizes than previously estimated. Mapping networks of co-methylated probes associated with neural correlates of social attention implicated enrichment of pathways involved in brain development. Longitudinal modelling found covariation between phenotypic traits and DNA methylation levels in the proximity of genes previously associated with cognitive development, although larger samples and more complete datasets are needed to obtain generalizable results.In conclusion, assessment of DNA methylation profiles at multiple time-points in infant-sibling designs is a promising avenue to comprehend developmental origins and mechanisms of ASD.     

Parental play styles and sibling interaction during a problem‐solving task

Associations between parental play styles and sibling interaction were investigated in 30 same‐sex preschool‐ and school‐aged sibling dyads (first‐borns were 4–9 years, M=6.6 years; second‐borns were 2–7 years, M=4.2 years), divided into older and younger sibling groups. Participants completed puzzles under three conditions: (a) siblings alone, (b) together with mother, and (c) together with father. Prosocial and agonistic sibling‐directed behaviors and positive and negative parent–child behaviors were coded. Siblings engaged in both more prosocial and agonistic interactions when alone than with either parent; there were no differences in sibling interactions in the mother versus father episodes. Paternal negative behavior was associated with sibling agonistic behavior when the children were alone, indicating second‐order effects, however, mother–child and sibling interactions were not significantly associated. Nevertheless, reciprocity in positive and negative behaviors directed by children to parents and vice versa was evident, demonstrating synchrony in patterns of exchanges. The findings underscore the necessity of studying both parents in order to understand more fully the dynamics involved in family relationships. Copyright © 1999 John Wiley & Sons, Ltd.     

Social comparisons with siblings made by adolescents with a learning difficulty

Social comparisons and the family environment are important antecedents of self-esteem. In this study the self-esteem and perceptions of stigma of 50 adolescents with a mild-moderate learning difficulty were measured. The self-esteem and stigma scores were factor-analysed to produce five factors: Positive self; Social competence; Being different; Anxiety; and Work competence. Social comparisons made by the adolescents between themselves and their siblings were also measured. Most adolescents 'preferred' (chose more often and gave high scores to) older same-sex siblings while younger opposite-sex siblings were the least preferred (were chosen less often and derogated). An explanation for these findings is suggested in terms of defensive social comparisons due to the loss of self-esteem in having a younger sibling ‘overtake’ the adolescent on developmental milestones, and in the tendency for non-handicapped pre-pubescent children to derogate the opposite sex during gender identity formation. This explanation is supported by the finding that the adolescents with younger siblings scored higher on the Anxiety factor than those who compared themselves with older siblings. Those with younger same-sex siblings were the most anxious. There was also a tendency for adolescents with siblings to score lower on one of the factors than adolescents with no sibling. The discussion raises the questions of how to deal with social comparisons within the family and how to talk to the child with mild learning difficulties about his or her handicap.     

Determinants of Joint Attention in Young Siblings' Play

The nature of joint attention (JA) engagement of 32 sibling pairs (M age older sibling = 55.21 months; M age younger sibling = 19.60 months) was assessed in a free play context. Relations among JA engagement states, both siblings' age, temperament, and language, and older sibling theory of mind were explored. The frequency of coordinated JA was related to features of temperament of both the younger siblings (emotionality) and the older siblings (activity level and sociability). Younger siblings' age was significantly related to siblings' engagement in coordinated JA, whereas the older siblings' age and theory of mind correlated with the frequency of passive JA engagement. Implications regarding the role of partner characteristics in young sibling JA interactions will be discussed. Copyright © 2011 John Wiley & Sons, Ltd.     

Attention to lexical stress and early vocabulary growth in 5-month-olds at risk for autism spectrum disorder

Typically developing infants differentiate strong–weak (trochaic) and weak–strong (iambic) stress patterns by 2 months of age. The ability to discriminate rhythmical patterns, such as lexical stress, has been argued to facilitate language development, suggesting that a difficulty in discriminating stress might affect early word learning as reflected in vocabulary size. Children with autism spectrum disorder (ASD) often have difficulty in correctly producing lexical stress, yet little is known about how they perceive it. The current study tested 5-month-old infants with typically developing older siblings (SIBS-TD) and infants with an older sibling diagnosed with ASD (SIBS-A) on their ability to differentiate the trochaic and iambic stress patterns of the word form gaba. SIBS-TD infants showed an increased interest in attention to the trochaic stress pattern, which was also positively correlated with vocabulary comprehension at 12 months of age. In contrast, SIBS-A infants attended equally to these stress patterns, although this was unrelated to later vocabulary size.