MRI acquisition
Bold-oxygenation-level-dependent (BOLD) functional MRI (fMRI) data was acquired on a 3-Tesla MRI scanner (Magnetom, Siemens Medical systems) with a 32-channel head coil. Functional images during the ER task consisted of 45 T2-weighted echoplanar imaging (EPI) slices (TR=3000ms, TE=30ms, flip angle=90°, field of view=192 mm, voxel size=3×3×3mm, 200 volumes, acquisition time (TA)=10 min, 6 s). Functional images during the CCT consisted of 45 T2-weighted EPI slices (TR=3000 ms, TE=30 ms, flip angle=87°, field of view=192 mm, voxel size=3×3×3mm, 120 volumes, TA=6 min, 6 s). Additionally, fieldmaps volumes (magnitude and phase difference images) were acquired (echos at 5.19 and 7.65 ms, TR=488, flip angle=60°) to capture the inhomogeneities in the magnitude field. Structural scans were acquired via T1-weighted MR images (TR=2040 ms, TE=4.7 ms, flip angle=8°, field of view=192 mm, voxel size=1×1×1 isotropic, TA=5 min, 56 s).