Dear SPMer
I am conducting a research on the response of PTSD and non PTSD
patient to the repetition of their traumatic event.
We have 2 group one of PTSD patients and one of non PTSD patients.
For each patient we have 3 baselines and 4 repetition of the traumatic
story.
We want to check the difference in the reaction to the traumatic script
between the PTSD and control group.
We use three type of covariates
constant response - 0 0 0 1 1 1 1
rise during the repetition - 0 0 0 1 2 3 4
decrease during the repetition - 0 0 0 3 2 1 0
These covariates are not orthogonal. If I want to check in what region of
the brain the response correspond to each of the covariate how should I
define my contrasts?
How do I check the difference in response to each one of these covariates
between the groups ?
Thank you for your help.
Yoram Louzoun
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