[Eeglablist] adding event markers at EMG onset

Arnaud Delorme arno at ucsd.edu
Tue Jan 28 19:19:56 PST 2014


Dear Nive,

If your EMG onset are sharp and last and EMG last a definite period, you could try using the function File > Import event > From data channel then select a threshold and a put a long transition length. This might work.

Best,

Arno

On Jan 27, 2014, at 8:19 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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