Dear Jun,
Yes what you did is correct. For source extraction from the whole
window you could try choosing MMN option and then adding the image you
got from the short window as fMRI prior.
Best,
Vladimir
On 9/27/12, Jun Wang <[log in to unmask]> wrote:
> Dear SPM experts,
> I am doing source reconstruction on the ERPs from an auditory EEG
> study. Each subject was coregistered with his own MRI. Then I did group
> inversion. for inverse time window, previous discussion suggested limiting
> time window around significant cluster based on sensor level analysis. It
> did help since I got strange strong center brain activation when I did
> source reconstruction for whole trial(-1000ms to 400ms). see F2.jpg. When
> I limited reconstruction from 0 200ms, I got auditory cortex activation
> as expected.
> My questions are:
> 1) Is what I did correct?
> 2) What if I also want to extract source in auditory cortex from -1000ms
> to 400ms, then seems I have to do source reconstruction during whole time
> window. This approach seems inaccurate based on above results. How could I
> compromise this issue.
>
> Thanks for your feedback,
>
> Best,
>
> Jun
>
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