[FieldTrip] Will different EEG motages have effect on the result of granger connectivity?

[jan-mathijs schoffelen]

Hi Weina,

Yes, granger causality results will for sure change when you use different montages. When you replace each measurement (what you call 'mono-montage') with that measurement minus the average across the whole recording array (what you call 'average montage') the amount with which signals can be explained in terms of their own and the other signals' past will change as well. This most likely leads to 'granger causality' estimates which just reflect spurious interactions.

Best wishes,

Jan-Mathijs

On Sep 25, 2011, at 1:42 PM, 李卫娜 wrote:

> Dear all,
>   Is anyone knows about that wether different EEG motages (such as mono-motage or average montage) have effect on the result of granger connectivity?
>  
>                                                                                                          Weina
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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
J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

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