Neurostructural Heterogeneity in Youths With Internalizing Symptoms

Antonia N. Kaczkurkin, Aristeidis Sotiras, Erica B. Baller, Ran Barzilay, Monica E. Calkins, Ganesh B. Chand, Zaixu Cui, Guray Erus, Yong Fan, Raquel E. Gur, Ruben C. Gur, Tyler M. Moore, David R. Roalf, Adon F.G. Rosen, Kosha Ruparel, Russell T. Shinohara, Erdem Varol, Daniel H. Wolf, Christos Davatzikos, Theodore D. Satterthwaite

    Research output: Contribution to journalArticlepeer-review


    Background: Internalizing disorders such as anxiety and depression are common psychiatric disorders that frequently begin in youth and exhibit marked heterogeneity in treatment response and clinical course. Given that symptom-based classification approaches do not align with underlying neurobiology, an alternative approach is to identify neurobiologically informed subtypes based on brain imaging data. Methods: We used a recently developed semisupervised machine learning method (HYDRA [heterogeneity through discriminative analysis]) to delineate patterns of neurobiological heterogeneity within youths with internalizing symptoms using structural data collected at 3T from a sample of 1141 youths. Results: Using volume and cortical thickness, cross-validation methods indicated 2 highly stable subtypes of internalizing youths (adjusted Rand index = 0.66; permutation-based false discovery rate p <.001). Subtype 1, defined by smaller brain volumes and reduced cortical thickness, was marked by impaired cognitive performance and higher levels of psychopathology than both subtype 2 and typically developing youths. Using resting-state functional magnetic resonance imaging and diffusion images not considered during clustering, we found that subtype 1 also showed reduced amplitudes of low-frequency fluctuations in frontolimbic regions at rest and reduced fractional anisotropy in several white matter tracts. In contrast, subtype 2 showed intact cognitive performance and greater volume, cortical thickness, and amplitudes during rest compared with subtype 1 and typically developing youths, despite still showing clinically significant levels of psychopathology. Conclusions: We identified 2 subtypes of internalizing youths differentiated by abnormalities in brain structure, function, and white matter integrity, with one of the subtypes showing poorer functioning across multiple domains. Identification of biologically grounded internalizing subtypes may assist in targeting early interventions and assessing longitudinal prognosis.

    Original languageEnglish (US)
    Pages (from-to)473-482
    Number of pages10
    JournalBiological Psychiatry
    Issue number5
    StatePublished - Mar 1 2020


    • Cortical thickness
    • Heterogeneity
    • Internalizing
    • Structure
    • Volume
    • Youth

    ASJC Scopus subject areas

    • Biological Psychiatry


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