[FieldTrip] Leadfield of one condition with two different 'grad' structures
s.aurtenetxe at bcbl.eu
Wed Sep 16 15:21:44 CEST 2015
I would appreciate to get some advice on the following.
I am computing the leadfield (ft_prepare_leadfield) for the subsequent source analysis (ft_sourceanalysis) of ERF data acquired with Elekta Neuromag system.
My experiment is acquired in a unique run, including 3 randomized conditions for each participant normally.
Therefore, the unique 'cfg.grad' structure is used for the leadfield computation of each participant.
However, due to a must, the experiment was recorded into two independent runs (splited) for one of the participants. Here comes the issue:
Given that the 'grad' structure is specific to each run, this participant turns to with two different 'grad' structures for the same condition.
My question is: which is the most suitable approach to compute the leadfield of one condition when the data comes from two different runs, so when having two different 'grad' structures?
I would say that I should compute the leadfield and the sourceanalysis for each run and condition separately, and then join the solutions of the same condition.
But I wonder if this is a correct approach and/or if there is any additional/more appropriate approach for that.
Any comment will be very appreciated.
Thank you in advance.
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