[Eeglablist] Settings for cleanline

[Makoto Miyakoshi]

Dear Eric,

If the line noise is from 60Hz power line, it cannot have a true broad
range of 55-65 Hz. Probably it is due to low frequency resolution in your
power spectrum density.

Somehow CleanLine does not always remove the line noise as expected. One of
the causes is that if the targeted 60Hz has amplitude fluctuation within
the shorter time window than the sliding window it uses, that cannot be
modeled well. This is understandable. But it seems to fail in other cases
as well. I have never investigated in depth in these cases. Generally,
CleanLine works best when the linenoise is mild (up to 10 dB).

If you have line noise that cannot be subtracted using CleanLine, you may
want to

1. apply low-pass filter to cut all freqs above the noise frequncy
2. apply a notch filter to selectively suppress the noise frequency band

Recently I tried notch and confirmed good results (at least for ICA purpose)

Makoto



On Mon, Feb 27, 2017 at 9:10 AM, Eric HG <erichg2013 at gmail.com> wrote:

> Hi everyone,
>
> I have some data that has a very broad range of 60 Hz noise and not
> specific to the frequency (ranging from 55-65 Hz). Is there a way to set
> the settings for cleanline to remove this noise?
>
> Thanks a lot,
>
> Eric
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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