[Eeglablist] adding event markers at EMG onset

[nivethida t]

Hi Steve,
I actually had thought of the same solution too. But like you say, I will
have to go through the whole data manually once again. Thanks anyways for
your input. I appreciate it

Thanks,
Nive


On Mon, Jan 27, 2014 at 11:19 PM, Stephen Politzer-Ahles <
politzerahless at gmail.com> wrote:

> 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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>
>


-- 
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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