[Eeglablist] Shifted rejection boundaries in continuous data

[Makoto Miyakoshi]

Dear James,

Ah, that makes sense.

Makoto

2013/1/7 James Desjardins <jdesjardins at brocku.ca>

>  Hi Maria,
>
> I just came across a bug in the eegplot function that may account for the
> shifted rejection boundaries you reported finding while scrolling through
> your continuous data.
>
> If the paging buttons { [ << ] or [ >> ]} are quickly clicked twice it can
> happen that the signals will advance two windows, while the events will
> only advance 1 window (e.g. if you are displaying 50 seconds at a time and
> the current window starts at 100 seconds... then you double click [ >> ]
> quickly, the figure will display the signals from 200 to 250 seconds but
> the events that will be superimposed are the events for the time period of
> 150 to 200 seconds).
>
> This is a relatively harmless bug as it is only display... any further
> interaction with the GUI (including selecting time for rejection) refreshes
> the figure and the offset is corrected.
>
> Let me know if this could account for all of the symptoms that you found
> while scrolling your continuous data.
>
> I have reported this in EEGLab bugzilla (#1393) and will look into solving
> the issue over the next few days.
>
> James
> ------------------------------
>
>  On 18 Nov 2012, at 20:07, Maria Teresa Wijaya wrote:
>
>  Dear Makoto,
>
> I recorded my data using Biosemi Active two system with 64 electrodes at
> 256Hz. Data were band pass filtered at 0.1-20 Hz and re-referenced
> offline first to nose reference to remove bad channels. Removed channels
> were interpolated and the data were re-referenced to average reference.
> I then checked the continuous data for non-typical artifacts, removed
> them, and saved the data with a new name. The shifted rejection
> boundaries problem appeared in this new data set.
>
> Kindly let me know if I need to provide any other information.
>
> Thank you.
>
> Regards,
> Maria
>
>
>
> On Saturday 17,November,2012 01:33 PM, Makoto Miyakoshi wrote:
>
> Dear Maria,
>
>
>  We need more information to identify what caused this.
>
> Could you tell me more detail?
>
>
>  Makoto
>
>
>  2012/11/12 Maria Teresa Wijaya<a0089301 at nus.edu.sg>:
>
>
>  Dear list,
>
>
>   I did rejection on continuous data and noticed that the rejection
>
>  boundaries shifted from where they are supposed to be (picture here:
>
>  http://www.flickr.com/photos/89964745@N02/8178303896/in/photostream).
>
>  This happened to several of my subjects, and it also happened to someone
>
>  else in our lab before. My questions are:
>
>
>   - What are the possible reasons of this shift?
>
>  - Is there any way I can know if any of my event triggers have also been
>
>  shifted or if only the rejection boundaries are shifted?
>
>
>   Thank you for your help.
>
>
>   Regards,
>
>  Maria
>
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-- 
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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