head motion corrected by registering each frame to the first using AFNI's 3dvolreg (Cox, 1996).
\(B_0\) distortions were corrected using the reversing gradient methods (Holland et al., 2010).
displacement field estimated from spin-echo field map scans
applied to gradient - echo images after ajdustment for between-scan head motion
corrected for gradient non-linearity distortions (Jovicich et al., 2006).
between scan motion correction across all fMRI scans in imaging event
registration between \(T_2\)-weights, spin-echo \(B_0\) calibration scans and \(T_1\)-weighted structural images performed using mutual information (Wells et al., 1996).