Hello AFNI gurus - I have a data analysis question.

I am looking to look at the effect of genotype status (3 categories, ie 2 homozygous and 1 heterozygous) on imaging results, (i.e., resting state functional connectivity and emotional processing), within a sample that is divided by exposure status (i.e., a simple yes/no). This is my first time working with this kind of data and I am not sure how to proceed. My hypothesis is that group results differ by genotype status, although I am concerned that genotype may have both between and within group effects.

From my reading of the helpfiles, it appears this would be suited for 3dMEMA? Any advice and direction is appreciated, if there are relevant articles published using AFNI methods out there.

Many thanks in advance

Noah