[FieldTrip] freq / time range for source analysis?

smoratti at psi.ucm.es smoratti at psi.ucm.es
Mon Jul 1 15:39:49 CEST 2013

Hi Cornelius,

I had the same kind of data and I picked the whole time frequency range of the cluster. It depends a bit on how big your clusters are and if there is a theoretical reason to split time and frequency windows (for  example high and low gamma, etc.). 



Stephan Moratti, PhD

see also: http://web.me.com/smoratti/

Universidad Complutense de Madrid
Facultad de Psicología
Departamento de Psicología Básica I
Campus de Somosaguas
28223 Pozuelo de Alarcón (Madrid)


Center for Biomedical Technology
Laboratory for Cognitive and Computational Neuroscience
Parque Científico y Tecnológico de la Universidad Politecnica de Madrid
Campus Montegancedo
28223 Pozuelo de Alarcón (Madrid)

email: smoratti at psi.ucm.es
Tel.:    +34 679219982

El 01/07/2013, a las 14:12, cornelius abel escribió:

> Dear FT-List,
> in an MEG experiment we tested the power difference (40-100Hz, 10 tapsmofreq) between two experimental conditions not averaging over time and frequency. 
> We found a nice significant cluster in the lower gamma range and in the first half of the time range. 
> Please have a look at the two figures. 
> http://dropcanvas.com/0fnvn
> Fig a is the multiplotTFR of stat, showing only significant areas. 
> Fig b is the sum over channels of the significance mask giving the number of significant channels at the corresponding freq/time point.
> Now, we are not sure how to pick the time and freq range for a subsequent source analysis. 
> Should we take the whole time/freq range in which any channel/time/freq combination became significant? Or is it better to pick some center value, also to increase power in the source analysis?
> Any ideas?
> Greetings, Cornelius
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