Towards a reliable and valid assessment of preteen suicidal thoughts and behavior - Project Summary The preteen years are a critical period in which to study the development of suicidal thoughts  and behavior (STB). During this period, youth experience changes in emotion regulation and  develop cognitive capacities that include an emerging understanding of the permanence of  death, which, in turn, affect the expression of STB. However, as noted in the 2021 NIMHSponsored Research Round Table Series: Risk, Resilience, and Trajectories in Preteen  Suicide, research on preteen STB has been hindered by the field’s failure to focus on an  accurate, and thorough, assessment of STB in this age group. This application seeks to  develop and test a comprehensive approach to the assessment of preteen STB that includes  child and parent/guardian self-report, clinician interviews, an implicit association test, a death  understanding interview, and observational measures. In order to address this question, this  application will examine both concurrent and predictive validity of the assessment approach in  a sample of preteens receiving intensive psychiatric services (inpatient or partial  hospitalization) who have a range of internalizing and externalizing symptoms, as well as a  range of STB. We will recruit 360 children and caregivers at Bradley Hospital/Brown Medical  School and the Johns Hopkins School of Medicine. In addition to refining the assessment of  preteen STB, we will also: 1) conduct a thorough clinical assessment of related  symptomatology to better inform clinical practice, and 2) examine mechanisms hypothesized  to underlie preteen STB, using an RDoC-informed approach. We will also examine which cooccurring symptoms and mechanisms significantly improve predictive validity for adverse  clinical STB outcomes above that of the STB assessment alone. This assessment approach is  innovative in that it is the first study to develop a multi-modal, multi-informant assessment  approach for preteen STB across a range of backgrounds, experiences, and  sociodemographic characteristics including use of real-time observational strategies, as well  as an implicit association test. This is significant because we are studying the most high-risk  population of preteens with STB and we will be able to delineate mechanisms related to  preteen STB, including health disparities, ensuring our findings will be generalizable beyond  our sites. This work addresses: NIMH Strategic Objective 2.1.B “Characterize the emergence  and progression of mental illnesses”, 2.2.A “Determining early risk and protective factors and  related mechanisms”, and 2.2.B“Developing reliable and robust biomarkers and assessment  tools to predict illness onset, and course, across diverse populations”.