Children were first introduced to the MR scanner setting with a child-friendly mock scanner training, which allowed them to acclimate to the MR environment. Structural neuroimaging was acquired as one aspect of a 40-minute imaging protocol, which included breaks as individually requested, on a 3-T Siemens Trio Tim MRI scanner with a standard Siemens 32-channel phased array head coil. A structural T1-weighted whole-brain anatomical volume was acquired (multiecho MPRAGE; acquisition parameters: TR = 2,350 ms, TE = 1.64 ms, TI = 1,400 ms, flip angle = 7°, FOV = 192 × 192, 176 slices, voxel resolution = 1.0 mm3, acceleration = 4). An online prospective motion correction algorithm was employed to mitigate motion artifacts, in which 10 selective re-acquisition time points were acquired to replace time points impacted by head motion (Tisdall et al., 2012 (link)). To further monitor potential motion during acquisition, a researcher stood near each child in the MRI room to present a physical reminder to stay still throughout the session when necessary. Diffusion-weighted images were acquired with 10 non-diffusion-weighted volumes (b = 0) and 30 diffusion-weighted volumes (acquisition parameters: b = 700 s/mm2, 128 × 128 mm base resolution, isotropic voxel resolution = 2.00 mm3).