Dear Eugene & Donald,
Thanks for your responses.
Sorry, after requesting clarity I inadvertently introduced some confusion. Group 1 and Group 2 contain different subjects (Subject1 Group 1 is not the same as Subject1 Group 2).
It sounds like my design allows me to test the main effect of time and the group x time interaction but not the main effect of group - if I replace the EVs holding each subject's mean effect with a single column of ones would the main effect of group contrast then be valid?
Pos effect of time 1 - I thought this showed scan 1 > scan 2 ;and pos effect of time 2, scan 2 > scan1.
Many thanks
Jon
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