Dear SPM experts
I identified significant different regions among three groups (for example,saying three groups as 'A', 'B', and 'C') performing voxel-wise one-way ANOVA with using SPM8 software. So I want to do post-hoc pair-wise t-test between 'A' and 'B', between 'B'
and 'C', and between 'C' and 'A'.
So I have some questions.
1) Should I perform these post-hoc t-test to whole brain? Or should I perform them to the only region which is identified as significantly different by the ANOVA analysis?
2) When I perform these post-hoc t-test, should I adopt bonferroni corrected p-value? (say, 0.05/3 in this case).
3) If areas of the significant region with the post-hoc t-test is larger than those of the significant region with the ANOVA,
how should I interpret those regions outside of the region identified by the ANOVA?
Thank you very much for your help.
Best
Takuya
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