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Hi,

I'm new to fsl. I am trying to deal with motion in children.

Here is the situation:
-Two groups of children (Control group vs. Motion-heavy group)
-1.5 Tesla Scanner (slices interleaved, TR 2 sec)
-Three runs, block-design, 3 different conditions (A B C A B C A B C A)
-Each block is 40 sec long

Problem:
Several subjects from the motion-heavy group and some from the control
group have motion of 2-5 mm. The motion is mostly restricted to only one or
two blocks within a run (e.g. the first A and B blocks or the second B and
C blocks). I do not want to just exclude the whole run because these motion-
blocks. To avoid this, I am trying to decide between the following possible
approaches:

a. Set each block as a different condition and then define motion-blocks as
covariates of no interest
b. Remove volumes specific to the motion-blocks

Questions
1. What are the possible problems/consequences of these approaches?
2. Is there any other option to consider?

It would very useful to hear concepts or suggestion about this regard.

Thanks in advance!
Carlos