[FieldTrip] source-level phase coherence (following beamforming extended tutorial)

[jan-mathijs schoffelen]

Hi Vitoria,

> Intuitively, I myself had first chosen the approach discussed in the tutorial connectivity extended, in particular "Source-level cortico-cortical connectivity in MEG data". When then computing the LCMV, I had the positions in grid.pos for the maximum activity both for the anterior and the posterior activity taken from the data shown in the figure. Would this be the most appropriate/best way of getting the phase coherence between these two sources?

Yes, this would be one way of doing it. Note that by just focussing on two dipolar sources, and not accounting for the spatial structure in the coherence, you may run the risk in over-interpreting any difference across conditions (in particular in the presence of differences in source power). More about this can be found in the paper Joachim and I published in HBM, in 2009.

Best wishes,
Jan-Mathijs



> 
> Any thoughts or suggestions are most welcome!
> Thanks a lot, Vitória
> 
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Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

http://www.hettaligebrein.nl

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