[FieldTrip] Too many dipoles in Beamformer Analysis?

Tzvetan Popov tzvetan.popov at uni-konstanz.de
Thu Jul 23 18:36:28 CEST 2015

Hi Helen,
this isn’t normal and is likely due to mismatch in units. I suspect the error somewhere in cfg.grid.resolution = XX;
during the call to ft_prepare_leadfield. 

> Dear Fieldtrip Users,
> I'm in the midst of computing Beamformer source analysis with my EEG data, (I am a new user of FieldTrip), and am experiencing extraordinarily long computation times.
> Using my own data, with the FieldTrip template vol.mat headmodel, FieldTrip computes a leadfield with 1,472,505 dipoles inside the brain. This alone takes my computer 3 hours to compute, whereafter source analysis still has to take place ... taking another 3 hours. 
> This number of dipoles seems (to me) abnormally high - but apart from taking so long, the code runs fine without any errors.
> Is anyone able to weigh in on whether or not I've gone wrong somewhere? Happy to include code as needed.
> Thanks very much!
> Helen Wieffering
> Bowdoin College
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