<html><head></head><body bgcolor='#FFFFFF' style='font-size:10pt;background-color:#FFFFFF;font-family:Verdana, Arial, sans-serif;'>Hi davide,<br/><br/>what headmodel and grid are you using?<br/><br/>Michael<br/><br/><br/><blockquote style="border-left: 2px solid blue; margin-left: 5px; padding-left: 5px; padding-top: 5px;"><hr/><b>Von:</b> "Davide Rivolta" <drivolta81@gmail.com><br/><b>Gesendet:</b> Oct 19, 2011 3:54:37 PM<br/><b>An:</b> "Email discussion list for the FieldTrip project" <fieldtrip@donders.ru.nl><br/><b>Betreff:</b> [FieldTrip] beamforming - normilise issue<br/><br/><div>Dear all,</div><div> </div><div>I am trying to use beamforming for some MEG data.</div><div> </div><div>I have 1 condition, and I wish to compare it against the baseline. Ideally I wish to have the average of all group and statistically compare stimulus agains baseline..</div><div> </div><div>As such, for each subject I calculate the source for the baseline and the source for the stimulus (using a common filter as indicated on the website).</div><div> </div><div>I then call ft_sourceinterpolate and, since I wish to have a group analysis, ft_volumenormalise.</div><div>In order to compute the average, I call ft_sourcegrandaverage.</div><div> </div><div>Even though the help tells me that it is fine, the grandaverage does not work if the input is from the ft_volumenormalise. It is because there is not the ".pos" field!</div><div> </div><div>Am I doing something wrong?</div><div> </div><div>Any advice would be great.</div><div> </div><div>Thanks a lot,</div><div> </div><div>Davide</div></blockquote></body></html>