[Eeglablist] ant and eeglab

Mon Jan 7 06:29:44 PST 2013

Hello Anahita

EEGLAB recently got the possibility to average selected channels in STUDY directly from the GUI.

The example below plots the average of three channels and store the average data and times.

STUDY = pop_erpparams(STUDY, 'averagechan','on');
[STUDY avgdata erptime] = std_erpplot(STUDY,ALLEEG,'channels',{'Fp1' 'Fpz' 'Fp2'});

Best
Jens

-----Ursprungligt meddelande-----
Från: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] För Stephen Politzer-Ahles
Skickat: den 5 januari 2013 11:27
Till: anahita khorrami
Kopia: eeglablist
Ämne: Re: [Eeglablist] ant and eeglab

Hi Anahita,

Regarding your first question: You are asking how to add the average of several channels back into the montage as a new channel? I'm afraid I don't know how to do that. But maybe someone else on the list can help with that.

For your second question, the only way I know to do that in standard EEGLAB is to first merge the various files for that subject (using
pop_mergeset() or the menu option in the GUI), and then extract epochs around that stimulus as usual. But I'm not familiar with STUDY and ERPLAB, so those might have other methods I don't know about.

Best,
Steve

On Sat, Jan 5, 2013 at 6:02 PM, anahita khorrami <asaliam20 at gmail.com> wrote:
> hi
> thank you. but there is another question. if I average several 
> channels how I call this new channel in EEGLAB(plogin)?
> one more question
> if I have several block or recorded file for one person for signal 
> averaging on one stimuli for one person which part of GUI is helpful?
> best
> On Fri, Jan 4, 2013 at 11:09 AM, Stephen Politzer-Ahles 
> <politzerahless at gmail.com> wrote:
>>
>> Hi Anahita,
>>
>> You don't need any plugin to average channels, you can just use the
>> mean() command in MATLAB. For example, if you want to average 
>> channels 6, 7, and 8, then
>>
>> mean( EEG.data(6:8,:) )
>>
>> will give you the average across those channels
>>
>> As for re-referencing the average of A1 and A2, it depends whether 
>> either of those was your online reference during the recording. See 
>> sccn.ucsd.edu/pipermail/eeglablist/2012/005585.html and 
>> http://sccn.ucsd.edu/pipermail/eeglablist/2012/005576.html. 
>> Basically, if your recording reference was something other than A1 or 
>> A2, you can re-reference in the GUI by just selecting A1 and A2 (this 
>> will average them); if A2 was your recording reference, then a way to 
>> re-reference to the average is to subtract (A1)/2 from all channels.
>>
>> On Fri, Jan 4, 2013 at 6:01 PM, anahita khorrami 
>> <asaliam20 at gmail.com>
>> wrote:
>> > Hi Dear all
>> > I want to know if there is possible to average several channels 
>> > withh plogin? if possible  how?
>> > second question I want to know how to define avereage of (A2+A1)/2 
>> > in rereference with plogin ?
>> > best
>> >
>> > On Thu, Dec 27, 2012 at 1:38 AM, anahita khorrami 
>> > <asaliam20 at gmail.com>
>> > wrote:
>> >>
>> >>
>> >>
>> >> ---------- Forwarded message ----------
>> >> From: Bernhardsson Jens <Jens.Bernhardsson at miun.se>
>> >> Date: Wed, Nov 28, 2012 at 6:35 AM
>> >> Subject: Re: [Eeglablist] ant and eeglab
>> >> To: Arnaud Delorme <arno at ucsd.edu>
>> >> Cc: "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
>> >>
>> >>
>> >> Hi
>> >>
>> >> Importing *.cnt file some events are coded as numbers and some as 
>> >> string, this is a known error and have been solved by converting 
>> >> the triggers to either string or number
>> >> https://sccn.ucsd.edu/bugzilla/show_bug.cgi?id=1161
>> >>
>> >>
>> >> With the new importer I had to convert from string to number and 
>> >> back to string again in order for eeglab to read the triggers 
>> >> correctly.
>> >> And in this specific order.
>> >>
>> >> for i=1:size(EEG.event,2);
>> >>     EEG.event(i).type=str2double(EEG.event(i).type);
>> >>     EEG.event(i).type=num2str(EEG.event(i).type);
>> >>     EEG.event(i).urevent=i;
>> >>     end;
>> >>
>> >>
>> >> What kind of a problem can occur, if any, with handling the 
>> >> trigger data like this?
>> >> Is there a smoother way to do this?
>> >>
>> >> Also, Arno do you have any clue of the magnitude of event latency 
>> >> problem with the older importer?
>> >>
>> >> Best
>> >> Jens
>> >>
>> >>
>> >>
>> >>
>> >> -----Ursprungligt meddelande-----
>> >> Från: eeglablist-bounces at sccn.ucsd.edu 
>> >> [mailto:eeglablist-bounces at sccn.ucsd.edu] För Arnaud Delorme
>> >> Skickat: den 27 november 2012 19:07
>> >> Till: anahita khorrami
>> >> Kopia: eeglablist at sccn.ucsd.edu
>> >> Ämne: Re: [Eeglablist] ant and eeglab
>> >>
>> >> Dear Anahita,
>> >>
>> >> I have noticed a problem with the event latencies of the ANT 
>> >> import plugin.
>> >> The event latency were wrong in some case.
>> >> Replace the following function in eeglab/plugins/anteepimport1.08
>> >>
>> >>
>> >>
>> >> https://sccn.ucsd.edu/svn/software/eeglab/plugins/anteepimport1.09
>> >> /pop_loadeep.m
>> >>
>> >> Note that this plugin was originally developed by ANT not by us.
>> >> Thanks,
>> >>
>> >> Arno
>> >>
>> >> On 19 Nov 2012, at 03:10, anahita khorrami wrote:
>> >>
>> >> >  Hi
>> >> >     I hope some one help me. I analyze the ANT file and open the 
>> >> > data with
>> >> >     eeprobe. ar this time I use EEGlab Plogin. inspite of 
>> >> > showing the events
>> >> >     numbers but when I want to select the event there is noting 
>> >> > on the
>> >> >     browse. in addition with event field I added the triger file 
>> >> > of ANT which
>> >> >     is a note pad. would you please what can I do with this problem?
>> >> >     best regards
>> >> > anahita khorrami _______________________________________________
>> >> > Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>> >> > To unsubscribe, send an empty email to 
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>> >>
>> >>
>> >> _______________________________________________
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>> >
>> >
>> > _______________________________________________
>> > Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>> > To unsubscribe, send an empty email to 
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>>
>>
>>
>> --
>> Stephen Politzer-Ahles
>> University of Kansas
>> Linguistics Department
>> http://people.ku.edu/~sjpa/
>
>

--
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://people.ku.edu/~sjpa/

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