fMRI image acquisition
BRAIN
We collected data on a Prisma 3-T MR system at the UCLA Ahmanson-Lovelace Brain Mapping Center. We collected 148 functional volumes using a T2* weighted gradient echo-planar sequence with the following parameters: matrix size = 64 × 64, 3.1 × 3.1 × 3 mm voxels, repetition time (TR) = 2.0 s, echo time (TE) = 24 ms, flip angle (FA) = 90°, FOV = 1200 mm, bandwidth = 2605 Hz/Px, 20-channel head coil, and no acceleration. Volumes consisted of 36.3 mm slices with a distance factor 33%, and slice orientation tilt of 22.5% relative to the AC/PC plane. At the end of the scanning session, a high-resolution structural volume (MPRAGE) was collected with the sequence parameters: 1.1 × 1.1 × 1.2 mm voxels, TR = 2.3 s, TE = 2.95 ms, FA = 9°, distance factor 50%, and parallel imaging implementation mode GRAPPA with an acceleration factor of 2. The first 96 participants were run with scans going from posterior to anterior. Since dropout of signal can depend on the direction of the scans, for optimal coverage of the ventral PFC, we ran the last 90 participants with scans going from anterior to posterior. Contrasting blood oxygen level-dependent (BOLD) activation for participants whose images had posterior to anterior 