[Eeglablist] re referencing to average after ICA

[Raquel London]

Dear all,

Thank you all for your answers and useful links. I have a follow-up
question regarding the 1Hz filter Makoto suggests using before running ICA.
I would use this filter just for the ICA and then apply the weights to the
unfiltered data. But I was actually wondering about the slow drifts that
this filter tackles; how do such artifacts impact on time frequency
analyses and/or ERP's? Can I leave them in (as I would if doing the
backtransform), provided I am mainly interested in frequencies above 3 Hz?
Or should I reject these trials regardless?

Thank you!
Raquel

On Tue, Aug 30, 2016 at 11:08 PM, Akshay Maggu <akshaymaggu86 at gmail.com>
wrote:

> Hi Raquel,
> It is usually recommended to clean up all your data, broadly, i.e. remove
> bad channels, remove large artifacts, HP filter, put to common average
> *before* you run ICA, for good results. You might wanna refer to Makoto's
> prep pipeline: https://sccn.ucsd.edu/wiki/Makoto's_preprocessing_pipeline
>
> Bests,
> Akshay
>
> On Tue, Aug 30, 2016 at 11:38 PM, Raquel London <raquellondon at gmail.com>
> wrote:
>
>> Dear eeglabbers,
>>
>> I'm using an average reference for my experiment, and I want to try and
>> use ICA to clean up some dirty electrodes to avoid having to throw them out.
>> Is it OK to do this first (run ICA, throw out any electrodes that could
>> not be cleaned with ICA) and then afterwards do the rereferencing to the
>> average?
>>
>> Thank you!
>> Raquel
>>
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>
>
>
> --
> Akshay Raj Maggu,
> Laboratory for Language, Learning and the Brain,
> Department of Linguistics and Modern Languages,
> The Chinese University of Hong Kong,
> Hong Kong.
> Webpage: http://www.cuhk.edu.hk/lin/new/people/students/maggu/
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>
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