Hi all
I am looking for some guidance into how to decide if a subject has
simply moved "too much", in other words, how much motion is too much
motion?
I have been using a shorthand guide and only have included Ss who moved
less then one voxel (in this case, 3mm) and trusted that motion
correction could handle that. But does the kind of motion matter? For
example, I have a subject now who only moved ~ 2mm across a 1/2 hour
scan but the motion was concentrated at specific times with sharp peaks
in the graph.
So, my question is how can I convince myself that SPM has done a good
job at correcting the motion?
What are some tests of the data that I can implement (besides including
motion as a regressor..).???
thanks much
lila
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