Dear Vladimir
Thank you very much for your reply. It’s very useful.

I have done this step:

1.     Choose prepare of convert menu

2.     Chose import from work space of file menu ( my data is one matrix with 129*275 that 129 are channels number and 275 are sample of per channel )

3.     All of my channels  are ‘EEG’

4.     Sample rate is 256 Hz

But, when I Import my data, the GUI wants the second dimension of data is time while its sample in my data,   What should I do?   And that it is important to transform the time domain or not?

Thank you

Best regard

vafa89

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From: Vladimir Litvak <[log in to unmask]>
To: [log in to unmask]
Sent: Monday, 22 June 2015, 15:47:50
Subject: Re: [SPM] The question of load data in DCM

Dear vafa89,

I suggest that you look at 'Converting arbitrary data' section in the manual. In SPM12 there is an easy option to do it via the 'Prepare' GUI tool. DCM and 3D GUI expect data in SPM format so you need to make sure your data are prepared correctly (including channel labels and types) before you go there. 

Best,

Vladimir

On Mon, Jun 22, 2015 at 8:44 AM, Vafaei Vafaei <[log in to unmask]> wrote:

Dear All

I am studying on DCM for ERP , for this , I use EEG dataset and I extract ERP information from it which for each subject, leads to a 83*129*275 matrix ,where 83 indicates number of trials , 129 indicates the number of channels and 275 is number of samples in each trial. The database is visual memory rather than auditory.

 In our EEG dataset we also have the electrode locations in Cartesian x, y, z coordinates, and the polar coordinate system as well .

I wonder if SPM toolbox in 3Dsource part, could give any information regarding to identification of the active regions on the brain Such as coordinates of the DCM requires in the electromagnetic model part. If yes, what is the algorithm which enable SPM to get to the source information by using channel information?

How can I load my own dataset in SPM? , so far I couldn’t do it at all in any part of SPM, I mean neither in 3Dsource part and nor in DCM (load data) part.

best regard

vafa89