Jeff
PPI's are done on first level images.
As you suggest
> i am wondering if it makes sense to conduct a ppi on first level analysis on
> each member of the group and then enter the created ppi image con.files into
> a second level analysis (one sample t-test). the logic seems right, but i am
> unsure. thank you in advance for any help on this matter.
would be the correct way to perform a group analysis.
-----
Darren Gitelman
On Wed, Apr 29, 2009 at 1:22 PM, Jeffrey West <[log in to unmask]> wrote:
> hello
>
> i am attempting to conduct a ppi analysis on a group of 10 subjects. i have
> conducted the first level analyses, followed by the second level analyses,
> which include the one sample t-test for the group. i then conducted a voi
> analysis on the one sample t-test and found an area of interest.
>
> the problem arises when i tried to follow-up the voi on the group with the
> ppi for the group. i recieved the following error messages:
>
> ??? Reference to non-existent field 'RT'.
>
> Error in ==> spm_peb_ppi at 94
> RT = SPM.xY.RT;
>
> ??? Error using ==> spm_peb_ppi
> Reference to non-existent field 'RT'.
>
> ??? Error while evaluating uicontrol Callback
>
> any information on what i need to do to conduct the ppi analysis on the
> group would be greatly appreciated, for i can conduct a ppi on the
> individual first level analysis just fine, but i am interested in the group
> as a whole.
>
>
> jef
>
|