Hiya Rick,
Thanks for replying! Um, I need to be able to explain how the slice is arrived at. It sounds like AFNI, as you say, just opens the middle slice based on the total number of sag slices, but I must assume that heads are symmetrical in order to take AFNI's word for it, no? I need for the midsag slice to be truly the middle slice of the sag fissure. I'm going to do an analysis of whether the area of the corpus callosum in the midsag slice correlates highly with the volume of the corpus calosum. Perhaps I should just eyeball it?
For the record, I'm using AC-PC aligned images.
Thanks as usual you smart guy.
Jodene