[Mne_analysis] fthresh in dSPM
e7362 at hotmail.com
Wed Jul 13 05:11:11 EDT 2011
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
> 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
> mne_average_estimates (which is documented in the manual) should also
> be useful for algebraic manipulations on a set of stc files.
> On Thu, 2011-03-17 at 15:27 -0400, Alexandre Gramfort wrote:
> > 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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