Neuroimaging data acquisition
PAD
Neuroimaging was performed using a 3T Philips Achieva scanner (Philips Inc.) at the Diagnostic Imaging Sciences Center, University of Washington. Imaging began with the acquisition of a T1-weighted anatomic scan (MPRAGE) to guide normalization of functional images (∼6 min) with TR = 7.60 ms, TE = 3.52 ms, TI = 1100 ms, acquisition matrix = 256 × 256, flip angle = 7°, shot interval = 2530 ms, and 1-mm isotropic voxel size. Functional data were acquired using a T2∗-weighted echoplanar imaging (EPI) sequence with TR = 2000, TE = 25 ms, flip angle α = 79°, field of view = 240 × 240 × 129 mm, 33 slices, and a voxel size of 3 × 3 × 3.3 mm with 3.3-mm gap. Button presses were registered using a two-button MR-compatible response pad.