Behavioral pathways from sibling relationships in adolescence to romantic partnerships in adulthood.

Sibling relationships in adolescence provide rich and relevant socializing opportunities for developing early adult romantic relationships, but much less is known regarding the effect of siblings on future romantic partnerships. Using a prospective, longitudinal design, we investigated the association between observed positive behaviors (warmth, support, positive communication), sibling pairs during adolescence (7th, 8th, 9th, and 10th grades), and the same observed behaviors between adult romantic partners nearly two decades later (M age = 31 years old). In structural equation models (SEMs), we tested four dyadic pathways of interest: (1) individual behavioral continuity; (2) evocative partner effects; (3) sibling modeling; and (4) sibling-to-partner matching. In multiple group analyses, we also investigated gendered socialization effects for different sibling dyads (i.e., brother-brother; sister-sister; and mixed-sex sibling pairs). Results showed strong continuity from adolescent behavior toward their sibling to the same behavior toward their romantic partner in early adulthood, but there was no evidence for sibling modeling effects nor for sibling matching. We also found significant differences between sister-sister sibling dyads compared to brother-brother and mixed-sex sibling dyads for the evocative pathway. Findings highlight the "long view" of positive adolescent behavior in sibling relationships for shaping future romantic partnerships in adulthood.

The Effect of Parents and Peers on the Neural Correlates of Risk Taking and Antisocial Behavior During Adolescence.

Social and neurobiological factors independently associate with the development of antisocial behavior during adolescence, yet it is unclear how these factors contribute to antisocial behavior in girls. Using a longitudinal sample of 45 adolescent girls (age in years at scan: M = 15.38, SD = 0.33), this study examined the contributions of parent-adolescent relationship quality and deviant peer affiliation from 6th-8th grades along with the neural correlates of risk taking in 9th grade to later antisocial behavior. High parent-adolescent closeness in early adolescence predicted lower antisocial behavior for girls in later adolescence via lower affiliation with deviant peer groups and less activation of the medial prefrontal cortex during risk taking. Findings highlight the enduring role of parents and peers during adolescence, and the importance of investigating social relationships alongside the brain to identify a holistic understanding of the development of antisocial behavior in girls.

Neural connectivity underlying adolescent social learning in sibling dyads.

Social learning theory posits that adolescents learn to adopt social norms by observing the behaviors of others and internalizing the associated outcomes. However, the underlying neural processes by which social learning occurs is less well-understood, despite extensive neurobiological reorganization and a peak in social influence sensitivity during adolescence. Forty-four adolescents (Mage = 12.2 years) completed an fMRI scan while observing their older sibling within four years of age (Mage = 14.3 years) of age complete a risky decision-making task. Group iterative multiple model estimation (GIMME) was used to examine patterns of directional brain region connectivity supporting social learning. We identified group-level neural pathways underlying social observation including the anterior insula to the anterior cingulate cortex and mentalizing regions to social cognition regions. We also found neural states based on adolescent sensitivity to social learning via age, gender, modeling, differentiation, and behavior. Adolescents who were more likely to be influenced elicited neurological up-regulation whereas adolescents who were less likely to be socially influenced elicited neurological down-regulation during risk-taking. These findings highlight patterns of how adolescents process information while a salient influencer takes risks, as well as salient neural pathways that are dependent on similarity factors associated with social learning theory.

The role of early attachment and parental presence in adolescent behavioral and neurobiological regulation.

Early attachment shapes brain development underlying emotion regulation. Given that sensitivity to affective cues is heightened during adolescence and effective emotion regulation strategies continue to develop, it is imperative to examine the role of early attachment and parental influence on adolescent regulation. Fifty-one children (M age=32.61 months) participated in a modified Strange Situation with their mother and approximately 10 years later (M age =13.2 years) completed an fMRI scan during which they were presented with appetitive and aversive affective cues (images of adolescent interactions) during a Go-Nogo task. They completed the task alone and in the presence of a parent. Behavioral multilevel models and whole-brain analyses showed attachment-related patterns, such that affective cues elicited greater behavioral and neural dysregulation in insecure (versus secure) adolescents.Furthermore, parental presence buffered behavioral and neural dysregulation toward socially aversive cues for adolescents with early insecure attachment, underscoring the salience of caregivers across development in promoting regulation in their offspring.

Siblings as buffers: Social problems and internalizing and externalizing behaviors across early adolescence.

Youth who struggle to maintain positive peer relationships are more likely to display emotional and behavioral problems, particularly during adolescence. Alternative avenues of social support may buffer against these maladaptive outcomes, particularly sibling relations, as they oftentimes predict adolescent outcomes above and beyond that of parents and peers. The present study examined the role of objective sibling warmth on the longitudinal association between social problems and maladjustment in a sample of 45 adolescent sibling dyads, further testing how effects varied between younger (Mage = 12.1; 24 females) and older (Mage = 14.5; 21 females) siblings. Sibling interactions were observed during cooperative and stressful problem-solving tasks, and later coded for expressions of warmth directed from one sibling to the other. Adolescent social problems and internalizing and externalizing behaviors were collected by multi-informant report and at a 1-year follow-up. Multilevel analyses indicated that adolescents with older siblings who exhibited more warmth were buffered against the effect of social problems on externalizing behaviors, with marginal effects for internalizing symptoms. Younger sibling warmth did not serve as a buffer for older sibling maladjustment. These findings emphasize the importance of considering how multiple dimensions of social support operate to influence functioning, particularly early in adolescence. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Where You Lead, I Will Follow: Exploring Sibling Similarity in Brain and Behavior During Risky Decision Making.

This exploratory study examined whether social learning increases similarity in adolescent siblings' behavior and neural patterns during risky decision making. Participants included 86 adolescents (43 sibling dyads; younger siblings: Mage  = 12.2 years; 22 females; older siblings: Mage  = 14.6 years; 20 females) who completed questionnaires, and a decision-making task during an fMRI scan. Younger siblings became more similar to their older siblings' risky decision making after observing their older sibling take risks). Younger siblings who reported greater modeling of their older sibling, and less differentiation from them, showed increased neural similarity to their older siblings in the ventromedial prefrontal cortex, and the right anterior insula and ventral striatum, respectively. These findings highlight siblings as salient social agents in how adolescents process risky decision making.