Magnetic resonance imaging (MRI) was obtained from all participants at the baseline year (age 12–14 years) and at follow-ups; the present analyses focus on imaging from the baseline time point only. All scans were acquired on a single 3.0 T CXK4 short bore Excite-2 magnetic resonance system (General Electric, Milwaukee, WI) with an eight-channel phase array head coil at the UCSD Center for Functional MRI. Subjects were instructed to remain motionless while a high-resolution T1-weight anatomical spoil gradient recall (SPGR) scan was obtained (TE/TR = min full, field of view = 24 cm, resolution = 1 mm3, 170 continuous slices). For the present analyses, structural MRIs were acquired on a single occasion at baseline. Cortical thickness, area, and volume estimates were obtained in the same manner as previously published by our laboratory (Jacobus et al. 2014 (link), 2015 (link)). FreeSurfer (version 5.1, surfer.nmr.mgh.harvard.edu) was used for cortical surface reconstruction and to obtain cortical thickness estimates (Fischl et al. 1999 (link); Dale et al. 1999 (link)). The cross-sectioning process, cortical thickness calculation, and parcellation procedure have previously been described in detail (Jacobus et al. 2015 (link)). The Desikan-Killiany atlas was used for generating parcellation units.