Do the Transmissible Liability Index (TLI) and Adolescent Cannabis Use Predict Paranoid and Schizotypal Symptoms at Young Adulthood?

Background: Adolescent cannabis use is an established risk factor for the development of psychosis, but the premorbid vulnerability factors and specificity versus generality of the psychotic symptom domains affected in cannabis-psychosis relationships remain incompletely understood. To improve our understanding of these relationships, we used longitudinal data to examine the individual and interactive effects of preadolescent transmissible liability to substance use disorders (SUD), measured via the transmissible liability index (TLI), and adolescent cannabis use on the development of two distinct psychotic symptom domains, paranoid and schizotypal personality traits in young adulthood. Methods: We performed secondary analysis of data from the Center for Education and Drug Abuse (CEDAR) study, which longitudinally assessed offspring of men with (N = 211) and without (N = 237) lifetime history of SUD at ages 10-12, and across adolescence as they transitioned to young adulthood. TLI scores were calculated at age 10-12, self-reported cannabis use was assessed at age 16, and paranoid and schizotypal symptoms were assessed at age 19. Results: Cannabis use at age 16 and family history of SUD were significantly associated with paranoid and schizotypal symptoms at age 19, but TLI scores were not. The interactive effect of TLI x cannabis use was also not significant. Paranoid and schizotypal symptoms showed different dose-dependent sensitivities to cannabis exposure at age 16. Conclusions: These findings indicate that adolescent cannabis use and family history of SUD differentially contribute to the development of paranoid and schizotypal personality traits through mechanisms that do not include behavioral disinhibition.

Temperament disturbances measured in infancy progress to substance use disorder 20 years later.

OBJECTIVE: This prospective study determined whether temperament before two years of age predicts transmissible risk for substance use disorder (SUD) up to a decade later and SUD outcome in adulthood. METHOD: Boys between 10 and 12 years of age (N = 482) were tracked to age 22. The previously validated transmissible liability index (TLI) was administered at baseline, and temperament prior to two years of age was retrospectively rated. The Structured Clinical Interview for DSM-III-R (SCID) was administered to document presence/absence of SUD for parents at baseline and sons at age 22. RESULTS: Path analysis revealed that number of parents with SUD predicted severity of temperament disturbance in their sons which in turn predicted TLI score at age 10-12, presaging SUD. Temperament before age two did not predict SUD at age 22. The association between number of SUD parents and transmissible risk was mediated by severity of temperament disturbance. CONCLUSION: Temperament disturbance in early childhood, reflecting quality of behavioral and emotion regulation, comprise psychological antecedents of transmissible risk for SUD.

C'mon get happy: reduced magnitude and duration of response during a positive-affect induction in depression.

BACKGROUND: Depression involves decreased positive affect. Whether this is due to a failure to achieve or maintain positive emotion in response to discrete stimuli is unclear. Understanding the nature of decreased positive affect could help to address how to intervene in the phenomenon, for example, how to structure interventions using positive and rewarding stimuli in depression. Thus, we examined the time course of affect following exposure to positive stimuli in depressed and healthy individuals. METHODS: Seventy-one adults with major depressive disorder and thirty-four never-depressed controls read a self-generated highly positive script and continuously rated their affect for 7 min. RESULTS: Both groups quickly achieved increased positive affect, however, compared to controls, depressed participants did not achieve the same level of positive affect, did not maintain their positive affect, spent less time rating their affect as happy, and demonstrated larger drops in mood. CONCLUSIONS: These data indicate that depressed and nondepressed individuals can generate positive reactions to happy scripts, but depressed individuals cannot achieve or sustain equivalent levels of positive affect. Interventions for depression might fruitfully focus on increasing depressed individuals' ability to maintain initial engagement with positive stimuli over a sustained period of time.

Modeling the association between sexual maturation, transmissible risk, and peer relationships during childhood and adolescence on development of substance use disorder in young adulthood.

BACKGROUND: This prospective study investigated pubertal timing and transmissible risk in relation to affiliation with deviant peers on the development of substance use disorder (SUD). METHOD: Participants were boys (N = 500) ascertained through proband fathers with (N = 250), and without (N = 250) DSM-III-R lifetime diagnosis of SUD who were prospectively tracked from age 10-12 to 22. Transmissible liability index (TLI), Tanner stage, peer delinquency, and substance use were measured at ages 10-12 and 16. SUD diagnosis during early adulthood was determined. RESULTS: Structural equation modeling revealed two pathways in which transmissible risk and sexual maturation influenced development of SUD. In the first pathway, transmissible risk was correlated with and prospectively predicted affiliation with deviant peers and substance use presaging SUD. In the second pathway, advanced sexual maturation positively predicted affiliation with deviant peers and substance use, which in turn predicted SUD. However, transmissible risk was not associated with pubertal development. CONCLUSION: These findings indicate that advanced sexual maturation and transmissible risk constitute unrelated facets of SUD liability; however, both factors bias development toward SUD via affiliation with deviant peers. SCIENTIFIC SIGNIFICANCE: Youth with advanced sexual maturation and/or transmissible risk for SUD are at higher risk for developing SUD. Additional research is needed to determine if addressing these risk factors will contribute to advancements in SUD prevention.

Editorial: Parenting in Mind: Neurodevelopment and the Influence of Children's Most Profound Relationship.

Parenting style, defined as the context of parenting practice,1 is foundational to research on mother-child relationships because it is observable, amenable to intervention, and influences risk of mental illness in offspring. For example, a recent systematic review demonstrates an association between negative parenting styles and the development of internalizing disorders in children.2 Therapies incorporating parenting style are standard treatment for youth with externalizing disorders. Given that the mother-child relationship is ever-present starting before birth and influences mental health, there is keen interest to elucidate the influence of parenting style on children's neurobiological development.

Parsing Heterogeneity in the Brain Connectivity of Depressed and Healthy Adults During Positive Mood.

BACKGROUND: There is well-known heterogeneity in affective mechanisms in depression that may extend to positive affect. We used data-driven parsing of neural connectivity to reveal subgroups present across depressed and healthy individuals during positive processing, informing targets for mechanistic intervention. METHODS: Ninety-two individuals (68 depressed patients, 24 never-depressed control subjects) completed a sustained positive mood induction during functional magnetic resonance imaging. Directed functional connectivity paths within a depression-relevant network were characterized using Group Iterative Multiple Model Estimation (GIMME), a method shown to accurately recover the direction and presence of connectivity paths in individual participants. During model selection, individuals were clustered using community detection on neural connectivity estimates. Subgroups were externally tested across multiple levels of analysis. RESULTS: Two connectivity-based subgroups emerged: subgroup A, characterized by weaker connectivity overall, and subgroup B, exhibiting hyperconnectivity (relative to subgroup A), particularly among ventral affective regions. Subgroup predicted diagnostic status (subgroup B contained 81% of patients; 50% of control subjects; χ2 = 8.6, p = .003) and default mode network connectivity during a separate resting-state task. Among patients, subgroup B members had higher self-reported symptoms, lower sustained positive mood during the induction, and higher negative bias on a reaction-time task. Symptom-based depression subgroups did not predict these external variables. CONCLUSIONS: Neural connectivity-based categorization travels with diagnostic category and is clinically predictive, but not clinically deterministic. Both patients and control subjects showed heterogeneous, and overlapping, profiles. The larger and more severely affected patient subgroup was characterized by ventrally driven hyperconnectivity during positive processing. Data-driven parsing suggests heterogeneous substrates of depression and possible resilience in control subjects in spite of biological overlap.

Management of the adolescent with substance use disorders and comorbid psychopathology.

Substance use disorders are common in youth, and co-occurring psychiatric disorders are present in the majority of cases. This article reviews clinical considerations unique to the population, including intricacies of assessment and special treatment considerations. Several psychotherapeutic intervention models are discussed, including cognitive-behavioral therapy, dialectic behavior therapy, motivational enhancement therapy/motivational interviewing, family behavior therapy, multidimensional family therapy, and multisystemic therapy. Research on psychopharmacologic treatment is limited, and primarily focuses on mood disorders and attention deficit/hyperactivity disorder. To maximize outcome, recommendations based on practice parameters promote integration of treatment modalities versus serial or concurrent treatment of co-occurring substance use and psychiatric disorders.

Mentoring increases connectedness and knowledge: a cross-sectional evaluation of two programs in child and adolescent psychiatry.

OBJECTIVE: The authors assess changes in knowledge and feeling connected to the field of child and adolescent psychiatry (CAP) after participation in a brief mentoring program held at two CAP conferences. METHODS: Similar mentorship programs were implemented at two CAP conferences, one national (N=119 participants), one international (N=53). The 4-day programs were part of larger travel awards, and included daily small group meetings consisting of a mode of two mentors and six participants. The authors created a survey with 40 quantitative questions designed to measure the change in participants' perceptions related to the conference and mentoring program, and provided additional fields for narrative comments. RESULTS: Mean participant ratings were positive for all questions on the survey. Changes in connectedness were rated higher than those in knowledge. The highest mean ratings were related to feeling more connected to the host organization, to CAP, and to other program participants. Outcomes were similar between the two conferences, except for knowledge gained on research, which was higher among participants in the international meeting. Outcomes were similar across demographic variables, except for internationally trained participants rating higher on research knowledge, connectedness, and overall knowledge. Over 75% of participants felt they made a connection with their mentor, bonded as a group, and learned new things about CAP and the host organization. A qualitative review of comments revealed several themes, including heightened importance of networking, increased awareness of the field, improved connectedness, a desire for trainee-focused events, and mixed feelings about how much structure to provide within the mentorship experience. CONCLUSION: A brief group-style mentoring program is logistically feasible within large conferences, and can result in broad positive impact for trainees. Future studies are warranted to determine if these programs have lasting effects on connectedness, career choice, and career development.