Dear Vladimir,
I know the function but the problem is when my source reconstruction is complete, I do not know where the active sources are situated in millimeters. I need to select four or five of the most active sources and extract their signals but as I do not know their positions in millimeters, I thought maybe if I have a matrix of all the sources, I can select the rows which have higher intensities.
Would you please tell me how I can have a rough estimation of source positions in millimeters?
Best,
Pegah
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Pegah Tayaranian Hosseini
PhD Student
Room 4077, Tizard building (13)
Institute of Sound and Vibration Research
University of Southampton, SO17 1BJ, UK
Tel: 023 8059 2850
email: [log in to unmask]
________________________________________
From: Vladimir Litvak [[log in to unmask]]
Sent: 23 June 2011 18:24
To: Tayaranian Hosseini P.
Cc: [log in to unmask]
Subject: Re: [SPM] Inversion Matrix
Dear Pegah,
The functionality you are trying to develop is already available in
spm_eeg_inv_extract in the latest SPM update. This function is
accessible from GUI and batch.
Best,
Vladimir
On 23 Jun 2011, at 17:49, "Tayaranian Hosseini P." <[log in to unmask]> wrote:
> Dear SPMers,
>
> I am going to try doing some simple manipulations in extracting source signals but I have some problems.
>
> * I could find out that the J matrix is a conditional expectation in i conditions. What are these i conditions?
>
> * I can see that the T matrix has the same number of conditions. Would you please explain what this T matrix does?
>
> * After the inversion is complete, does M*U*data(in the desirable time course) give me the signal of the sources (in that specific time course) or there exists any other step that should be done?
>
> Thanks for your help.
>
> Best,
> Pegah
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