Dear Haoran,

Sent from my iPad

On 6 Dec 2010, at 15:03, "飞鸟" <[log in to unmask]> wrote:

Dear all,

　　Before we do the procedure of DCM for EEG/MEG, why should we do source

reconstruction first?

You don't have to do it. You do need source locations, but you can derive them based on previous studies, your hypothesis of any other theoretical consideration.

And what's the function of the sources' MNI coordinate? For projection?

As I explained in the previous e-mail DCM creates predicted sensor data using the lead field L. This lead field is computed for a particular source location and orientation.

Vladimir

　　Thanks. Best wishes to you!

　　Haoran
       Brain Imaging Lab
       Research Center for Learning Science,
       Southeast University,China

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