I forgot to mention before that right now I'm running fieldtrip-20120325 under Ubuntu 10.04.<br><br><div class="gmail_quote">On 26 March 2012 18:01, Maria Pefkou <span dir="ltr"><<a href="mailto:Maria.Pefkou@unige.ch">Maria.Pefkou@unige.ch</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear FieldTrip users,<br><br>I started using the toolbox fairly recently to analyse EEG data and I have huge trouble making a BEM model, which I need for source localisation.<br>
Following the online tutorial, I processed my subjects' individual structural MRIs in FreeSurfer and MNE and managed to prepare the triangulated mesh. However, my problem is the volume conduction model. I can get a singleshell one, using the ft_prepare_singleshell function, but as far as I understand it is excusively used for MEG data. I came to this conclusion because when I try to compute the forward model, given that I provide information about the electrodes position, I always get the following error: <br>
<br>"unsupported volume conductor model for EEG".<br>I guess this is because the vol.type is 'nolte' and there is no such case for EEG data, at least not in the ft_prepare_vol_sens.m function, which is automatically called.<br>
<br>I have tried to prepare a BEM model using the ft_prepare_headmodel function with cfg.method='bemcp' or cfg.method='dipoli' but I was unsuccessful.<br>The problem is that, after having tried various functions/options, I lost the general picture and I'm running in circles... The question is: I have a segmented mri, how can I get a BEM model out of this? I must be missing a fundamental part of the procedure but I can't quite find out what it is.<br>
Any suggestions/help would be very much appreciated.<br><br>Thank you in advance,<br>Maria Pefkou<br><br>------------------------------------------<br>Research Assistant<br>Functional Brain Mapping Lab<br>University of Geneva<br>
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