Re: [Freesurfer] purpose of creating own "average subject"

2008-03-28 Thread Michael Harms
Good points! I (partly) see the light :) Still (please correct me if I'm wrong), creating a study specific average subject for visualizing the "average" anatomy doesn't address the issue of whether the method by which those subjects were brought into register (i.e., via sphere.reg using a term i

Re: [Freesurfer] purpose of creating own "average subject"

2008-03-27 Thread Bruce Fischl
Hi Mike, imagine you had only on subject your study. Then using the buckner atlas as an overlay (or fsaverage, which is kind of equivalent) would not be representative at all. If the registration works perfectly and you have a fair number of subjects then there probably isn't much difference,

Re: [Freesurfer] purpose of creating own "average subject"

2008-03-27 Thread Michael Harms
Hi Bruce, Re your 2nd point: My assumption was that very few FS users are actually creating their own atlases. To do that you need to do (much) more than just run make_average_subject, right? (Namely, create your own .gcs file for annotations, and .tif for registration, correct? And isn't that

Re: [Freesurfer] purpose of creating own "average subject"

2008-03-27 Thread Bruce Fischl
Hi Mike, a couple of things. One is that creating your own average will give you a better ability to see what the true anatomical localization of your effects are. Another is that you can re-register your subjects to your own atlas, and possibly obtain better registration, particularly if your