[Eeglablist] Remove Bad epoch bad channels

[Makoto Miyakoshi]

Dear Patrick,

> Will the 100th channel still match the 100th channel of the other
datasets or will they be out of synch?

If you remove ch10, then your new ch10 is your previous ch11; thus channel
numbers will be out of synch (the channels names don't change, of
course...) If you don't like it you may want to interpolate the missing
channel(s) after ICA.

> So for some subjects there are some channels that are really really bad,
all over the place, range of Mv is about ±5000!!!!.

Try 'firstPassOutlierTrimmer' on this page. It'll show you a visualization
of simple summary over both channels and data points. Let me know if you
encounter a bug.

http://sccn.ucsd.edu/wiki/Plugin_list_process

Makoto


2013/10/10 Bedard, Patrick <patrick_bedard at brown.edu>

> Hi
>
> OK I'm starting to understand now....
> So for some subjects there are some channels that are really really bad,
> all over the place, range of Mv is about ±5000!!!!. I Think I should remove
> that channel and not interpolate it.  If I remove that channel, how will
> that affect subsequent analysis as now that dataset will have less channels
> than the other ones.  Will the 100th channel still match the 100th channel
> of the other datasets or will they be out of synch?
>
> thanks
> pat
>
>
>
>
>
>
> On Fri, Sep 27, 2013 at 11:04 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:
>
>> Dear Bedard,
>>
>> That's a good question. If you discard more channels you can save more
>> trials; if you discard more trials you can save more channels. EEG
>> preprocessing starts exactly from finding an optimum balance in this
>> trade-off!
>>
>> > Is there a way to remove bad epoch for each channel independently?
>>
>> Usually no, at least not from GUI. However there are ways to do it... if
>> you want to try our alpha-version plugin for it let us know.
>>
>> Makoto
>>
>>
>> 2013/9/24 Bedard, Patrick <patrick_bedard at brown.edu>
>>
>>> Hello all,
>>> I'm fairly new to EEG processing.
>>> Upon removing a bad channel I realized, after viewing the data, that it
>>> was because of 1 bad epoch.  So I though if removing tat bad epoch to save
>>> that channel, but then I realized that that epoch would be removed for all
>>> channels.
>>> Is this right?
>>> Is there a way to remove bad epoch for each channel independently?
>>> If not what should I do?
>>>
>>> thanks
>>>
>>> --
>>> --------------------
>>> Patrick Bédard, PhD
>>> Neuroscience Dept.
>>> Brown University
>>>
>>> _______________________________________________
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>
>
> --
> --------------------
> Patrick Bédard, PhD
> Neuroscience Dept.
> Brown University
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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