¥Data Preparation: Co-Registration (AKA ÒSpatial
NormalizationÓ)
HGroup analyses are performed on a voxel-by-voxel basis
HAll data sets used in the analysis must be aligned and defined
over the same spatial domain.
åTalairach domain for volumetric data
íLandmarks for the transform are set on high-res. anatomical data
using AFNI
íFunctional data volumes are then transformed using AFNI
interactively or adwarp from
command line (use option -dxyz
with about the same resolution as EPI data Ñ do not use the
default 1 mm resolution!)
åStandard meshes and spherical coordinate system for surface
data
åOnce
data is aligned, analysis is carried out voxel-by-voxel or node-by-node
íThe percent signal change from each subject in each task/stimulus
state are usually the numbers that will be compared and contrasted
íResulting statistics (voxel-wise or node-wise) can then be
displayed in AFNI and/or SUMA
H
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