Kathryn A. Degnan

Behavioral inhibition (BI) is a temperamental style characterized by cautious and fearful behaviors in novel situations. The present multi‐method, longitudinal study examined whether young children's observed and parent‐reported BI in social versus non‐social contexts predicts different long‐term psychosocial outcomes. Participants (N = 279) were drawn from a longitudinal study of socioemotional development. BI in social contexts (“social BI”) was measured via children's observed wariness toward unfamiliar adults and peers at 24 and 36 months and parents’ reports of children's social fear/shyness at 24, 36, and 48 months. BI in non‐social contexts (“non‐social BI”) was measured via children's observed fearful responses to masks and novel toys, and parents’ reports of children's distress to non‐social novelty at 9 months and non‐social fear at 48 months. At 15 years, anxiety was assessed via adolescent‐ and parent‐reports, and global internalizing and externalizing problems were assessed via parent‐reports. Confirmatory factor analysis showed that a two‐factor model fit the BI data significantly better than a single‐factor model, providing evidence for the dissociation of BI in social versus non‐social contexts. Social BI was uniquely associated with adolescent social anxiety, whereas non‐social BI was specifically associated with adolescent separation anxiety. Neither social BI nor non‐social BI predicted global internalizing and externalizing problems, providing evidence for the specific relations between BI and anxiety problems. Together, these results suggest that young children's inhibited responses in social versus non‐social situations predict different subtypes of anxiety problems in adolescence, highlighting the multifaceted nature of BI and the divergent trajectories of different anxiety problems.

The authors examined temperamental and sociocognitive predictors of socially anxious behavior from preschool to early adolescence. Children (N = 227; 59% male; 69% White) completed a speech task at ages 5, 7, 10, and 13 and socially anxious behaviors were coded. Behavioral inhibition (BI) was assessed at ages 2/3 and Theory of Mind (ToM) was assessed at age 4. Data collection occurred between 2003 and 2016. Three trajectories of socially anxious behavior were identified: high stable, average increasing, and low stable. Higher BI was related to the high stable trajectory, whereas lower ToM was related to the increasing trajectory of socially anxious behavior. There are heterogenous pathways of socially anxious behavior, which may be uniquely influenced by early temperamental and sociocognitive factors.

Exuberance, a profile of temperament characterized in toddlerhood by high approach motivation, positive affect, and sociability, is associated with both adaptive and maladaptive socioemotional outcomes. The aims of the current study were to introduce a novel approach/avoidance-eliciting social task, as well as longitudinally extend our understanding of toddlerhood exuberance to outcomes in middle childhood. Specifically, affect and social behavior at age seven during a high-intensity game were compared to that observed during a low-intensity freeplay task. As part of a longitudinal study, 291 infants were selected at 4 months for a wide range of reactivity to novelty. The sample was assessed repeatedly across early childhood (9, 24, and 36 months of age) and at 7 years of age. A high exuberance profile was formed with approach, positive, and sociable behaviors observed in the laboratory from 4 to 36 months. At 7 years of age, affect and social behavior were assessed during high- and low-intensity interactions with an unfamiliar peer in the laboratory. Path Analyses using structural equation models demonstrated that a high exuberance profile was associated with greater positive social behavior at age 7 during a high-intensity game, but not negative social behavior or behavior during a low-intensity freeplay task. These results illuminate the need for targeted methodology, such as high-intensity approach/avoidance-eliciting social tasks, in order to clarify the links between early temperament and adaptive or maladaptive socioemotional outcomes across development.

Does infant temperament predict adult personality and life-course patterns? To date, there is scant evidence examining relations between child temperament and adult outcomes, and extant research has relied on limited methods for measuring temperament such as maternal report. This prospective longitudinal study followed a cohort of infants (n= 165) for three decades to examine whether infant behavioral inhibition, a temperament characterized by cautious and fearful behaviors to unfamiliar situations, shapes long-term personality, social relationships, vocational/education, and mental health outcomes in adulthood. At age 14 mo, behavioral inhibition was assessed using an observation paradigm. In adolescence (15 y;n= 115), error monitoring event-related potentials were measured in a flanker task. In adulthood (26 y;n= 109), personality, psychopathology, and sociodemographics were self-reported using questionnaires. We found that infants with higher levels of behavioral inhibition at 14 mo grew up to become more reserved and introverted adults (β = 0.34) with lower social functioning with friends and family (β = −0.23) at age 26. Infant behavioral inhibition was also a specific risk factor for adult internalizing (i.e., anxiety and depression, β = 0.20) psychopathology, rather than a transdiagnostic risk for general and externalizing psychopathology. We identified a neurophysiologic mechanism underlying risk and resilience for later psychopathology. Heightened error monitoring in adolescence moderated higher levels of adult internalizing psychopathology among behaviorally inhibited individuals. These findings suggest meaningful continuity between infant temperament and the development of adult personality. They provide the earliest evidence suggesting that the foundation of long-term well-being is rooted in individual differences in temperament observed in infancy.