Hi,
I am so sorry to bother you again ,
I got some question these days
From (Dale et al., 2000).qi(t) is F distributed, with three degrees of freedom for the numerator.
The degrees of freedom for the denominator is typically large, again depending
on the number of time samples used to calculate the noise covariance matrix C.
1. in my study , my baseline is 100 ms , so I set F(0.95,3,100)=2.69 to be my fthresh of dSPM (x=2.69) ,is that right ?
2. I read out my stc file in MATLAB , and subtracted two condition ,then wrote back to stc file
should i use the same fthresh to show the result ? or don;t need to set any fthresh
because I got some problem, if I used the same fthresh, after subtracting two condition, i didn;t see anything on dSPM
I am so sorry to bother u again , hope anyone can help me
Eddie
Subject: Re: [Mne_analysis] A question which is about how to minus two conditions in freesurfer
From: hari at nmr.mgh.harvard.edu
To: gramfort at nmr.mgh.harvard.edu
CC: e7362 at hotmail.com; mne_analysis at nmr.mgh.harvard.edu
Date: Thu, 17 Mar 2011 15:56:44 -0400
Hi,
mne_average_estimates (which is documented in the manual) should also
be useful for algebraic manipulations on a set of stc files.
Regards,
Hari
> Hi,
>
> > these days , i use freesurfer and mne to analyze my MEG data
> > but now , i have a problem as follow :
> > 1.how can I minus two conditions , cus I wanna see the difference between
> > two conditions? EX: (deviant condition - standard condition)
>
> what is your setup? you want to compare within one subject? in a group
> of subjects?
>
> if it's just one subject, an easy solution consists in loading the STC
> files for
> both conditions in matlab, then do the difference and save the output
> in a new stc file that you can visualize with mne_analyse. If you want to do
> statistics that's a bit more complicated.
>
> hope this helps
>
> Alex
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