Dear all,
We are currently working on a project to see the effects of a drug
(botulinum toxin) on the activation of some brain area's. However to prove
that the decrease in signal is not a time-effect or training-effect, the
measurement is repeated 7 weeks after the injection. We thus have 3 time
points: A-->before injection, B--> after injection, C--> 7 weeks after
injection.
To see group results I followed the 'tripled T-test' instructions with the
contrasts for A-B, B-C and A-C, and this works perfectly.
However, we would very much like to see the contrast (A+C)/2-B, since this
gives us the difference between the time effect and the drug-effect. So far
I have not succeeded in this. Any suggestions are helpful!
Thank you in advance,
Sincerely, Matthijs
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