[FieldTrip] coherence vs magnitude squared coherence

[jan-mathijs schoffelen]

Hi Ingmar,
Sorry for the mix up. Apparently I was not yet fully awake when typing my previous reply. Blame it on the offspring, which kept me awake during some crucial parts of the night: where I typed 'Floris', I of course meant to type 'Ingmar' ;-). To all Florises on the list: this was a free answer to a question you didn't know you wanted to ask.

Best,
Jan-Mathijs

On Feb 18, 2014, at 6:43 AM, jan-mathijs schoffelen wrote:

> 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.
> 
> Best,
> Jan-Mathijs
> 
> 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
> 
> http://www.hettaligebrein.nl
> 
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

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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