Adolescence is characterized by increased risky decision-making, enhanced mesolimbic response to risk and reward, increased perceived stress, and heightened physiological response to stress relative to other age groups. In adults, evidence suggests that acute stress increases risky decision-making by stress-induced increases of dopamine in regions implicated in reward processing and decision-making. Acute stress also increases risky decision-making in adolescents, but the underlying neurobiological mechanisms remained unexplored. In this study, daily self-reports of stress were documented in adolescents and adults. Participants completed two fMRI visits during which they performed a risky decision-making task: once each when they endorsed a high and low level of stress. Results revealed that adolescent males took more advantageous risks under high stress relative to low stress whereas adult males took fewer non-advantageous risks under high stress relative to low stress. Adolescent males also showed a stress-related decrease in prefrontal activation when making risky decisions from high stress to low stress while adult males maintained prefrontal activation when making risky decisions across stress conditions. Adolescent and adult females did not exhibit stress-related changes in risky decisions. Moreover, greater prefrontal activation under stress was associated with fewer non-advantageous risks taken under stress. Implications for risk-taking under stress are discussed in light of these findings.

Insufficient sleep has been associated with increased risk-taking and poor decision-making, enhanced physiological responses to stress, and attenuated anterior insula (AI) activity to risk. The AI has also been linked to risky decision-making under acute stress. However, it is yet unknown how naturalistic sleep habits affect risky decision-making and AI activity when individuals feel stressed. In the current study, a daily diary approach was used to document participants' daily stress. Adolescents and adults reported their recent sleep duration and completed two fMRI visits during which they performed a risky decision-making task: once each when they endorsed a high and low level of stress. Results revealed that, regardless of age, individuals who reported receiving more sleep took fewer non-advantageous risks during high stress relative to those who reported receiving fewer hours of sleep per night while sleep duration was not associated with risky behavior under low stress. Among individuals who reported less sleep, those who exhibited reduced AI activation during risk-taking under high stress also took more disadvantageous risks whereas this effect was attenuated for those who reported longer sleep duration. Moreover, longer sleep duration was associated with greater functional coupling between the AI and dorsolateral prefrontal cortex (DLPFC) under high stress whereas sleep duration was not associated with AI-DLPFC functional coupling under low stress. These findings suggest that naturalistic sleep duration may amplify the effects of daily stress and alter risky decision-making behavior through interactions with the AI.

The current study investigated the impacts of parental behaviors (threat communication and comforting) on children's COVID-19 fears and whether effects differed by age.Caregivers of 283 children (5.5-17 years, M = 10.17, SD = 3.25) from 186 families completed online measures assessing children's and parents' COVID-19-related fears, children's sources of COVID-19 threat information, and parents' engagement in behaviors to reduce child distress (i.e., comfort behaviors). Higher COVID-19 fear in parents was associated with greater communication of COVID-19 threat information, which was associated with higher COVID-19 fear in younger, but not older, children. Over and above parental fear and threat communication, greater exposure to COVID-19 threat information from community sources (e.g., media, school, friends) was associated with greater COVID-19 fear in children, regardless of age. Greater engagement of parental comfort behaviors buffered the association between community sources of COVID-19 threat information and COVID-19 fears in older, but not younger, children. These findings suggest that younger children might be more vulnerable to developing heightened COVID-19 fears as a result of increasing sources of COVID-19 threat information in their lives. This study highlights the importance of supporting the socioemotional wellbeing of children and families through the COVID-19 pandemic and beyond.

Biologically embedded experiences alter developmental trajectories in ways that can influence health, learning, and/or behavior. These systematic differences in experiences may contribute to different biological outcomes as individuals grow and develop, including at the neural level. Previous studies of biologically embedded experiences on neurodevelopment have focused on large‐scale institutional or economic factors (e.g. socioeconomic status [SES]) and psychosocial factors (e.g. caregiving behavior). Less attention has focused on how the quality of the immediate home settings, such as the physical home environment (PHYS), influences neurodevelopment. Moreover, no study has investigated these effects in adolescents, who undergo significant physical maturation and neurodevelopment that may influence how they respond to their physical environments. The goal of the current study was to examine whether PHYS quality is biologically embedded in the developing adolescent brain as evidenced by cognitive achievement and cortical development in 56 (48% female) healthy adolescents (14–18 years (M = 16.83 years, SD = 1.17). Using in‐home assessments of the physical home environment, anatomical brain scans, and indices of academic achievement, we found that adolescents who have more physical problems in the home (e.g. structural hazards, crowding, excessive noise, poorly lit) have thinner prefrontal cortices, which was associated with lower levels of reading achievement, independent of SES and psychosocial factors. By conducting home visits to assess physical characteristics of adolescents’ home, we highlight a typically overlooked aspect of the home environment that has relevance for adolescents’ cognitive and brain development.

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