Comparing to zero

[Sanja Kovacevic]

Hi Dr. Holroyd,

I have a related question to your suggestion about using
afni to do the group analysis. Presumably afni is capable
to read CTF .mri and .svl files, but when I open afni from
a directory full of .mri files, I get a bunch of error
messages like ** THD_open_ctfmri(path/filename.mri): bad
version string. Have you ever encountered this problem?
Our CTF mri version, according to mrihead filename.mri, is
CTF_MRI_FORMAT VER 4.0. Could this be a reason for the
error messages I am getting?

Thank you in advance,

Sanja Kovacevic
Research Assistant
MIND Imaging Center
Albuquerque, New Mexico, USA
Phone: +1 (505) 272 3327
Fax: +1 (505) 272 4056


On Thu, 23 Jun 2005 10:22:57 -0400
  Tom Holroyd <tomh at KURAGE.NIMH.NIH.GOV> wrote:
> Tom Holroyd wrote:
>>> What would be the best way to find clusters that are
>>>significally
>>> different from zero?
>>
>>
>> One way is to to a group analysis using AFNI.  I'm using
>>that for
>> coherences---here's a snippet.
>
> Just a brief followup.  You can also do a within-subject
>analysis using AFNI by writing out each trial as a
>separate subbrik and doing a repeated-measures 3dANOVA or
>3dttest.  Then you don't need to be in Talairach space.
>
> --
> Dr. Tom Holroyd
> "A man of genius makes no mistakes. His errors are
>volitional and
> are the portals of discovery." -- James Joyce