[FieldTrip] coherence vs magnitude squared coherence

jan-mathijs schoffelen jan.schoffelen at donders.ru.nl
Tue Feb 18 06:43:08 CET 2014

Hi Floris,
Yes, if you want magnitude squared coherence, you need to square the value fieldtrip computes for you. Note that there is no single convention in the literature: some people report coherence, some report coherence squared.


On Feb 18, 2014, at 12:00 AM, Vries, I.E.J. de wrote:

> Hi Fieldtrippers,
> If I got it correctly, if you choose to calculate coherence (cfg.method='coh') with ft_connectivityanalysis, and you choose cfg.complex='abs' (which is the default), you get the absolute value of coherency, i.e. coherence. But not yet the magnitude squared coherence, which is usually reported in the literature for coherence. So all I need to do is square the coherence value calculated by Fieldtrip right? 
> Cheers,
> Ingmar
> _______________________________________________
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> fieldtrip at donders.ru.nl
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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


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