[Eeglablist] eeglablist Digest, Vol 129, Issue 7

[Rajyalakshmi Matta]

Dear experts,

    I am trying to analyze fieldtrip tool box. In keyval2cfg(varargin) what
is the input to be supplied. Can anybody please let me know?


Your help is more delighted

regards
M. Rajyalakshmi


M. Rajya Lakshmi
Ph D Scholar
KL University
Guntur.



On Thu, Jul 9, 2015 at 12:30 AM, <eeglablist-request at sccn.ucsd.edu> wrote:

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> Today's Topics:
>
>    1. Re: EEG AC and DC record problem (Makoto Miyakoshi)
>    2. Re: fmrib plugin gradient correction question (Makoto Miyakoshi)
>
>
> ---------- Forwarded message ----------
> From: Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> To: bjj2909102003 <bjj2909102003 at 163.com>
> Cc: eeglablist <eeglablist at sccn.ucsd.edu>
> Date: Tue, 7 Jul 2015 15:15:27 -0700
> Subject: Re: [Eeglablist] EEG AC and DC record problem
> Dear Booer,
>
> If data are recorded in what you call 'AC mode', you can't recover 'DC
> mode' data. It's like this:
>
> DC mode data = AC mode data + infraslow signal + DC difference
>
> I believe when you record data with 'AC mode' the recorder should use
> high-pass filter that removes infraslow signal and DC.
>
> Makoto
>
> On Mon, Jul 6, 2015 at 4:18 AM, bjj2909102003 <bjj2909102003 at 163.com>
> wrote:
>
>> Hi, everyone.
>> Recently, I recorded my EEG data in AC mode. And I made the model based
>> on AC mode data (range centred around zero). Now I want to analyze
>> on-line EEG data by my previous model. But the online data is acquired in
>> DC mode (value is big and not centred around zero) by access SDK. I
>> don't know how to convert DC mode data into AC mode data so that I can
>> apply the previous model into the data?
>>
>> Thank you.
>> Booer
>>
>> ------------------------------
>> bjj2909102003
>>
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>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
>
> ---------- Forwarded message ----------
> From: Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> To: basile pinsard <basile.pinsard at gmail.com>
> Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
> Date: Tue, 7 Jul 2015 15:31:11 -0700
> Subject: Re: [Eeglablist] fmrib plugin gradient correction question
> Dear Basile,
>
> > - having volume markers, is there any interest in switching to slice
> markers (that I could add myself, the scanner being regular)? Does the
> gradient template is then computed on slices and windowed on let say 30
> slices instead of 30 volumes? Or does this slice splitting is already
> performed in the software?
>
> It depends on whether you have identical artifact timecourse for every
> slice or not. I believe it is not the case. At least in my case, the last
> slice had visibly different artifact pattern from other slices... probably
> the first slice is different too. I believe using volume template (i.e.
> 30-slice long template).
>
> > - I removed the 4 ECG channels recorded from the residual artifact
> correction as suggested, however, there remains high-frequency content in
> the signal (see screenshot
> <http://s3.postimg.org/uyzdb2zgj/gradient_correction.png> with 1 ECG
> channel and EEG channels) only for these channels. Is that because the
> correction didn't work that well for these channels ? Is that something
> that I can fix? Does low-pass filter is compulsory in this step? Why EEG
> channels are not affected?
>
> First of all, the primary purpose of having ECG (or EKG if you like a
> German flavor) is to build artifact template, and what you need is just
> reliable peak detection. Your data, after cleaning, seems ok for this
> criterion. Low-pass filtering the ECG/EKG after cleaning is fine (I think
> fMRIb apply 20Hz low-pass or something when detecting ECG/EKG peaks...sorry
> if I'm wrong.) The reason why EEG channels are fine is probably that
> ECG/EKG channels have longer wires and they are less physically stable than
> those of EEG channels.
>
> Makoto
>
> On Sat, Jul 4, 2015 at 12:35 PM, basile pinsard <basile.pinsard at gmail.com>
> wrote:
>
>> Hi EEGlab users,
>>
>> I am quite new to EEGlab and trying to use the fMRIb plugin to correct
>> from MRI artifacts.
>> My questions are:
>>
>> - having volume markers, is there any interest in switching to slice
>> markers (that I could add myself, the scanner being regular)? Does the
>> gradient template is then computed on slices and windowed on let say 30
>> slices instead of 30 volumes? Or does this slice splitting is already
>> performed in the software?
>>
>> - I removed the 4 ECG channels recorded from the residual artifact
>> correction as suggested, however, there remains high-frequency content in
>> the signal (see screenshot
>> <http://s3.postimg.org/uyzdb2zgj/gradient_correction.png> with 1 ECG
>> channel and EEG channels) only for these channels. Is that because the
>> correction didn't work that well for these channels ? Is that something
>> that I can fix? Does low-pass filter is compulsory in this step? Why EEG
>> channels are not affected?
>>
>> Thank you very much for your help and ideas on this.
>>
>> basile
>>
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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