Hi,
On Mon, Nov 2, 2015 at 8:30 AM, Alain Imaging <[log in to unmask]> wrote:
> Hi everybody,
>
> I am using marsbar to extract the signal from the first level contrasts of
> several subjects.
>
> I constructed the contrast of interest for each subject at the first level,
> then I created a one sample t test and I fed the SPM.mat of this one sample
> t test to MarsBar in order to extract the signal from a bunch of
> predetermined ROIs.
>
> I end up with a matrix of the expected Subjects x ROIs size, but what
> surprise me are the values. I have not a big experience with extracting raw
> value using marsbar, but when I did it, I always end up with values between
> -1 and 1, or -10 and 10.
>
> Now I have values in the range of -500 and 500. Is it normal ? Can i trust
> these values ?
Just to check - you are extracting the data in the normal way from the
images in the SPM.mat? So these are the ``con_*nii`` images?
Have you checked the images to see what kind of values you get, outside marsbar?
Best,
Matthew
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