We are grateful to the families who participated in this study. We also thank Pooja M. Desai, Rachel RouChen Lin, Charles Sisk, Sarah Torres, Mayra Lemus Rangel, Rebecca Lichtin, Lexi Paul, Samantha Moffett, and Julissa Veras for data collection support; Rehan Rehman and Victor Issa Garcia for MRI quality assurance support; and Tabitha Davis and Dana Asby for transcribing the home audio recordings. This publication was supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through grant numbers UL1TR001873 and UL1RR024156. Additional funding was provided by the Russell Sage Foundation; the Gertrude H. Sergievsky Center, Columbia University Medical Center; Teachers College, Columbia University; and a National Institute of Mental Health training grant (T32MH13043). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH or other funders.