Hi Gonzalo, that contrast will not do the conjunction. You can do a conjunction explicitly by running mri_concat on the sig.mgh files for the age contrast and the cognitive measure contrast. Use the --conjunct option. doug

Gonzalo Sanchez Benavides wrote:

Dear Freesurfers,

I'm exploring the relationship among cortical thickness, aging and some cognitive variables in a sample of healthy elders, and I want to test this relationship regardless sex and years of education.

I think is easy to make contrasts to explore separately the correlation between age (or a cognitive measure) and thickness. However I am wondering if its possible to know the areas in which both correlations coincide.

Does it make sense to use a contrast like this for such purpose?

0 0 0.5 0.5 0 0 0.5 0.5 sex age edu cognitive measure

Many thanks in advance for your answer

-- Gonzalo Sánchez Benavides

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