Dear SPMers,
I was wondering whether anyone has any ideas about how much motion
is too much motion. In a current study that we are conducting, we are
collecting functional data with a voxel size of 3.75 X 3.75 X 5 mm. When
realigning a subject's functional data from this study, is 2 mm in the x-,
y-, or z- directions too much motion? What about 3 mm,or 10 mm? SPM
produces a postscript file that indicates how much motion it has estimated
during realignment, but would realignment work well if there was too much
motion? Is there an amount of motion (e.g., 2 mm, 3 mm , 5mm) at which
point realignment becomes less successful? Or, is it always equally
successful?
Thanks in advance!
:> Daniel Weissman
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