[Eeglablist] Reject data (all methods)

[Makoto Miyakoshi]

Dear Ida,

>Are there any suggestions how to implement any kind of "bad" parts of the
components removal, when having continuous data (before running second
ICA)?

When you plot raw EEG, you can choose time period (marked as light blue) to
register as bad data. You can reject the marked data portion later.

If you are interested in automated algorithm for that you may want to check
BCILAB.

Makoto

2013/3/24 ida miokovic <ida.miokovic at gmail.com>

> Dear Makoto, Mikolaj and Marco (and everyone else =)),
>
> thank you very much for your answers.
>
> Regarding 1st issue - Yes, I have been informed that there is a bug that
> causes this channels locations problem, I have seen that others reported
> the same issue, so I didn't reported it myself since it was said that this
> will be corrected in the next EEGLAB version. Marco, is it necessary for me
> to report this in order to get the developers version? How could I get it?
>
> Regarding 2nd issue - I didn't realize that mentioned methods are
> applicable only on epoched data. Are there any suggestions how to implement
> any kind of "bad" parts of the components removal, when having continuous
> data (before running second ICA)? Does EEGLAB support that? If not, any
> pipeline in MATLAB itself would be appreciated...
>
> Thank you very much again
>
> Ida
>
>
> On Fri, Mar 22, 2013 at 4:32 PM, Marco Montalto <montaltomarco at onvol.net>wrote:
>
>> Dear Ida,
>>
>> Regarding Problem no. 1, I was having the same problem with the same
>> version of EEGLAB you are using. When I plotted channel locations by
>> pressing plot-2D I used to get a plot with all channels squashed in the
>> bottom left hand corner of the plot. I reported the problem. Arno
>> reproduced the problem and made the necessary changes to the developer's
>> version of EEGLAB. I am using the developer's version now and the problem
>> is indeed solved. So I would recommend that you use the developer's version
>> to overcome this problem.
>>
>> Regarding Problem no. 2, (corroborating what was said previously
>> by Mikołaj Magnuski), Reject data (all methods) is greyed out because you
>> have not extracted any epochs. Since you are using continuous data you
>> cannot make use of this function, .
>>
>> Regards,
>> Marco
>>
>>
>> 2013/3/17 ida miokovic <ida.miokovic at gmail.com>
>>
>>> Dear list,
>>>
>>> I am running ICA decomposition on continuous data. I have several
>>> questions regarding this:
>>>
>>> 1. After applying lowpass filter and removing line noise (using
>>> Cleanline plug-in), I import the channel locations of the dataset. I am
>>> using EEGLAB v12.0.1.0b which is having issues with channel locations
>>> importing, but when I obtain ICA components, scalp maps seem to be plotted
>>> correctly, so I suppose that this bug does not influence this step? After
>>> that, I do the average reference.
>>>
>>> 2. Since I plan to run ICA second time, I should remove bad trials of
>>> the components (not entire component/s) using Tools --> Reject data using
>>> ICA --> Reject data (all methods). After doing all described above, I do
>>> not have an option to click on this tab "Reject data (all methods)" (it is
>>> grey). It is possibe to click only on "Reject components by map". Does
>>> anyone have an idea what could be the reason for this?
>>>
>>> 3. There is a suggestion that not more than 10% of the dataset should be
>>> rejected after applying all the methods I am interested in. Are some of the
>>> methods given it this menu (Find abnormal values, Find abnormal trends,
>>> Find impropable data, Find abnormal distributions, Find abnormal spectra
>>> (slow)) more convenient that others and which? Which way I can calculate
>>> what is the percent of the rejected data?
>>>
>>> 4. Should the mean of the all channels be removed somewhere in this
>>> procedure and where is it suggested to be done? As I mentioned, here
>>> contiuous data is used, so there are no epochs and no need for baseline
>>> removal.
>>>
>>>
>>> Thank you very much for any help.
>>>
>>> All the best
>>>
>>> Ida
>>>
>>>
>
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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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