In addition to Russ's astute comment, isn't it also true
that the brain SPM uses as a template (i.e., the MNI brain) is "a"
Tailarach space which should not be expected to have the same mapping of
coordinate to cytoarchitecture as the published atlas? I guess what one
would want is a Brodmann's mapping of the MNI brain average. This would be
a probabalistic mapping, I imagine.
Eric
>
> One should take the localization of Brodmann's areas on the basis of the
> Talairach Dameon (or any other source) with a BIG grain of salt. The
> variability in location of particualr BAs between subjects has been
> highlighted recently by work from Karl Zilles (reported at the Academy of
> Aphasia, I don't think it's published yet) showing that areas 45 and 46
> (determined on the basis of postmortem examination) show little
> consistency in their localization across subjects, either in
> terms of stereotactic space or in terms of particular anatomical landmarks
> like gyri and sulci. It can't be much different for most other brodmann's
> areas.
>
> I think that our use of BA labels is really a convenient fiction, and one
> should be very circumspect about such labeling.
>
> best,
> russ
>
> ----------------------------------------------------------------------
> Russ Poldrack Phone: (650) 725-0797 (NOTE NEW AREA CODE!)
> Dept. of Psychology Fax: (650) 725-5699
> Stanford University
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> Stanford, CA 94305 Web Page: http://www-psych.stanford.edu/~poldrack/
> ----------------------------------------------------------------------
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