[Eeglablist] adding event markers at EMG onset

Stephen Politzer-Ahles politzerahless at gmail.com
Mon Jan 27 20:19:26 PST 2014


Hi Nive,

You could do this using programmatically within MATLAB (i.e. by writing a
loop that goes through and finds spots within a certain distance of your
stimulus triggers where the signal exceeds some threshold; the details of
the code might depend a bit on the format of your EEG.event structure), but
in my experience doing this you I would still catch false positives
(picking up other task-irrelevant noise or movement that the participant
made) and misses (if the motion--which in my experiment was speech
articulation--doesn't cause MEG to go over the threshhold for some reason).
So I still had to go through by hand anyway and mark which trials were
actually good.

Best,
Steve



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/


On Tue, Jan 28, 2014 at 6:01 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:

> Dear Nivethida,
>
> I've heard there is a peak detector a while ago. Now I checked EEGLAB main
> GUI, but could not find such option.
>
> Makoto
>
>
> 2014-01-24 nivethida t <dr.nivethida at gmail.com>
>
>> Hi all,
>> I am trying to obtain the Bereitschaftspotential from 90 minutes of
>> continuous EMG and EEG data that have been collected from patients. I will
>> have to mark the onset of EMG activity, epoch the data 3s before the onset
>> and then average the epochs. Is there a way to automate adding event
>> markers at EMG onset on eeglab?
>>
>> Thanks,
>> Nive
>>
>> --
>> Dr.Nivethida Thirugnanasambandam,
>> Postdoctoral Visiting Fellow,
>> Human Motor Control Section,
>> National Institute of Neurological Disorders and Stroke,
>> National Institutes of Health,
>> Building 10, 7D42,
>> 10 Center Drive, MSC 1428
>> Bethesda, MD 20892 - 1428
>> Ph: +1-301-402-6231
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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