[Mne_analysis] event file and noise covariance matrix

[Eric Larson]

Hey Junpeng,

I think I had to be careful with my use of quotation marks to get
mne_process_raw to recognize the "STI101" stim channel. I /think/ it was:

--digtrig 'STI101'

that eventually worked. You can also try loading the raw data file in
MATLAB or mne-python. There, all channel names are easily accessible, so
you can then use them to get indices for the raw data to double-check that
you have the correct channel name.

Eric



On Tue, Apr 2, 2013 at 8:14 PM, Junpeng.zhang at gmail.com <
junpeng.zhang at gmail.com> wrote:

> Hi Alex,
>
> As you guess, the engineer told me that the stim channel is STI101.
> I start using the command
> mne_browse_raw --digtrig STI101
> and then load the *sss.fif
>
> The response is,
>
> 674 events found in
> /mnt/share/Huang_zhaoyang_MEG/Yang_Yingxue_MEG_data/MEG/MYB/mi_yu_bi_SEF_R_20120106_raw_tsss-eve.fif
> Trigger channel : STI101 max_event : 0
>
> in fact, the data is collected from an experiment: stimulus to the left
> and right median nerve and there should be two kinds of events.
> But when I click "show event list",  the event list is blank!
>
> The engineer told me that
>
> The left wrist stimulus in STI101 is 192, and right is 194. But why the
> response is max_event =0?
>
> I also tried to click the average button to average the data over event 1
> or 2,
> and the response as,
>
> Single category :
> stim ignore : off
>  grad reject : 2000.0 fT/cm
> mag  reject : off
> EEG  reject : off
>  EOG  reject : off
> ECG  reject : off
> grad flat : off
> mag  flat : off
>  EEG  flat : off
> EOG  flat : off
> ECG  flat : off
> Do not fix trigger skew
>  Average to trigger # 1 :
> t = -200.0 ... 500.0 ms
> event = 1
>  ignore = 0
> nave  = 0
>
>
> Would you like to help me figure out it?
>
> Best wishes,
> Junpeng
>
>
>
>
>
>
> ------------------ Original ------------------
> *From: * "Alexandre Gramfort"<gramfort at nmr.mgh.harvard.edu>;
> *Date: * Tue, Apr 2, 2013 03:00 PM
> *To: * "Junpeng.zhang at gmail.com"<junpeng.zhang at gmail.com>; **
> *Cc: * "mne_analysis at nmr.mgh.harvard.edu"<mne_analysis at nmr.mgh.harvard.edu>;
> **
> *Subject: * Re: [Mne_analysis] event file and noise covariance matrix
>
> hi Junpeng,
>
> what you need to average in an event file (-eve.fif file) or a stim
> channel.
>
> You can start mne_browse_raw with the --digtrig option to set a specific
> channel
> if different from STI014.
>
> HTH
> Alex
>
> On Tue, Apr 2, 2013 at 6:31 AM, Junpeng.zhang at gmail.com
> <junpeng.zhang at gmail.com> wrote:
> > Hi Experts,
> >
> >  My coauthor sent to me a *sss.fif.
> > I would use it to do research.
> > My questions are,
> >
> >  I only loaded the file into mne_browse_raw,
> > but I found I can not  do average operations.
> > Anyone know what additional file is needed to conduct average?
> > The engineer who operates the MEG device may not use MNE toolbox, but he
> > used maxfilter.
> > So should I tell him which additional files I need to conduct average or
> > calculation of noise covariance matrix?
> > assume that he could use all the software associated with eketa MEG
> device
> > and never use mne toolbox and that I need the files he created to conduct
> > average and calculation of noise covariance matrix.
> >
> > Please laugh at my so simple questions :).
> >
> > Thank you all in advance.
> > Junpeng
> >
> >
> >
> >
> >
> >
> > _______________________________________________
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