[Eeglablist] Question about Cleanline

[Makoto Miyakoshi]

Dear Eric,

First of all, did you apply it on the high-pass filtered data? CleanLine
uses EEGLAB's Welch's method for FFT (if I remember correctly) to evaluate
the spectrum, so the data needs to be high-pass filtered. See Nima
Bigdely-Shamlo's PREP pipeline paper for detail.

Did you average reference the data? It may help, especially if your data
are not re-referenced at all (like Biosemi's data).

Another thing is that you can expect a small improvement by doing this

 'SlidingWinLength',4,'SlidingWinStep',4

If these does not work, I recommend you band-pass filter your data 45-55Hz
to see stationarity of your 'line noise'-- is it really it??

Makoto


On Fri, Mar 4, 2016 at 2:14 AM, Eric HG <erichg2013 at gmail.com> wrote:

> Hi everybody,
>
> I've been trying to apply Cleanline instead of a notch filter but there
> seems to be a problem with some of the subjects. Cleanline doesn't seem to
> remove all the line noise (at 50 Hz) (see picture). Before I use cleanline
> I use the function pop_firwsord to high- and low-pass the EEG.
>
> I use cleanline with the following settings:
>
> [EEG, Sorig, Sclean, f, amps, freqs, g] = pop_cleanline(EEG, 'Bandwidth'
> ,2,'ChanCompIndices',[1:EEG.nbchan], ...
>
>                           'SignalType','Channels','ComputeSpectralPower',true,
> ...
>
>                           'LineFrequencies',[50] ,'NormalizeSpectrum',false,
> ...
>
>                           'LineAlpha',0.01,'PaddingFactor',2,'PlotFigures',false,
> ...
>
>                           'ScanForLines',true,'SmoothingFactor',100,
> 'VerboseOutput',1,    ...
>
>                            'SlidingWinLength',4,'SlidingWinStep',2);
> Does anyone know what might need to be changed to fix this?
>
> Best,
>
> Eric
>
>
> [image: Inline image 1]
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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