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Parental behaviors are potent risk and protective factors for youth development of externalizing problems. Firm control is a parenting strategy that is inconsistently linked to youth adjustment, possibly due to variations in individual biological contexts. Growing research shows that dyadic coregulation of the autonomic nervous system (e.g., parent-child physiological synchrony) is a neurobiological mechanism that links parenting to youth adjustment. However, physiological synchrony may be context-dependent (e.g., adaptive in positive interactions, maladaptive in negative interactions). We aimed to test the role of dyadic synchrony in respiratory sinus arrhythmia (RSA) during parent-child conflict as a mediator between parent firm control and youth's externalizing problems. To capture youth's stress reactivity, we also tested how galvanic skin response reactivity (GSR-R) moderated this indirect path. The sample included 101 dyads of low socioeconomic-status at-risk preadolescents and parents. Results indicated that youth higher levels of GSR-R significantly intensified the link between parent firm control and dyadic RSA synchrony during conflict. Dyadic RSA synchrony further predicted youth increased in externalizing problems. Overall, results suggest that when parents employ firm control parenting with highly reactive teens, dyadic RSA synchrony elevates, potentially modeling less optimal coping with conflict for the youth, which is associated with increased externalizing problems. K E Y W O R D S acute stress response, externalizing problems, parent-child dyadic synchrony, parenting | 471

Background A growing body of evidence supports the efficacy of measurement-based care (MBC) for children and adolescents experiencing mental health concerns, particularly anxiety and depression. In recent years, MBC has increasingly transitioned to web-based spaces in the form of digital mental health interventions (DMHIs), which render high-quality mental health care more accessible nationwide. Although extant research is promising, the emergence of MBC DMHIs means that much is unknown regarding their effectiveness as a treatment for anxiety and depression, particularly among children and adolescents. Objective This study uses preliminary data from children and adolescents participating in an MBC DMHI administered by Bend Health Inc, a mental health care provider that uses a collaborative care model to assess changes in anxiety and depressive symptoms during participation in the MBC DMHI. Methods Caregivers of children and adolescents participating in Bend Health Inc for anxiety or depressive symptoms reported measures of their children’s symptoms every 30 days throughout the duration of participation in Bend Health Inc. Data from 114 children (age 6-12 years) and adolescents (age 13-17 years) were used for the analyses (anxiety symptom group: n=98, depressive symptom group: n=61). Results Among children and adolescents participating in care with Bend Health Inc, 73% (72/98) exhibited improvements in anxiety symptoms and 73% (44/61) exhibited improvement in depressive symptoms, as indicated by either a decrease in symptom severity or screening out of completing the complete assessment. Among those with complete assessment data, group-level anxiety symptom T-scores exhibited a moderate decrease of 4.69 points (P=.002) from the first to the last assessment. However, members’ depressive symptom T-scores remained largely stable throughout their involvement. Conclusions As increasing numbers of young people and families seek DMHIs over traditional mental health treatments due to their accessibility and affordability, this study offers promising early evidence that youth anxiety symptoms decrease during involvement in an MBC DMHI such as Bend Health Inc. However, further analyses with enhanced longitudinal symptom measures are necessary to determine whether depressive symptoms show similar improvements among those involved in Bend Health Inc.

Objective: Posttraumatic stress disorder (PTSD) has been associated with heightened impulsivity and risk-taking behaviors, including higher rates of substance use than individuals without PTSD. Although a number of studies suggest that impulsivity is associated with substance use in PTSD, the specific role of impulsivity in this common pattern of comorbidity remains unclear. The current study investigated associations between PTSD symptoms, substance use patterns, and impulsivity in a sample of adults. Method: A total of 2,967 participants were recruited online through Amazon’s Mechanical Turk. Participants who did not report at least one Criterion A traumatic event on the Brief Trauma Questionnaire were excluded. The remaining 1,609 trauma-exposed individuals were placed into either the probable PTSD group (n = 406) or the trauma-exposed non-PTSD group (n = 1,203) based on their PTSD Checklist for Diagnostic and Statistical Manual of Mental Disorders, fifth edition (PCL-5) score. Impulsivity was assessed via a delay discounting measure and the brief UPPS-P (urgency, premeditation, perseverance, sensation seeking, and positive urgency) Impulsive Behavior Scale. Alcohol and cannabis were assessed using the Alcohol Use Disorders Identification Test (AUDIT) and Cannabis Use Disorders Identification Test (CUDIT-R) scales, respectively. Results: Probable PTSD participants exhibited steeper (more impulsive) delay discounting and endorsed more impulsive traits than participants in the trauma-exposed non-PTSD group. Moreover, the PTSD group reported significantly higher scores on both the AUDIT and CUDIT-R. Lastly, impulsive personality traits on the UPPS-P partially mediated the association between PTSD and both cannabis and alcohol use. Conclusions: These findings suggest that trauma-exposed individuals who exhibit elevated PTSD symptoms show heightened impulsivity. It also appears that lower levels of impulsivity may serve as a protective factor among trauma-exposed individuals resilient to the development of PTSD.