[Eeglablist] Fwd: Problem using CleanLine

[Christopher Barkley]

Apologies for the double email, but I wanted to add, to maybe assist in
resolving this issue, that when the CleanLine script is actually running,
it states that it is actually is removing *large* amounts of noise in and
around 20Hz (I have tried different bandwidths, as well as tinkering with
the step size and window size parameters), noise ranging all the way from
10 up to 14 dB. Yet when I save the 'cleaned' file, the spectral peak at
20Hz remains unchanged (despite the window showing original and cleaned
spectra for selected channels shows clear differences in the frequency band
that I'm interested in cleaning). Any input would be most helpful, all the
best.
- Chris
---------- Forwarded message ----------

From: Christopher Barkley <barkl025 at umn.edu>
Date: Thu, Mar 31, 2016 at 2:19 AM
Subject: Problem using CleanLine
To: eeglablist at sccn.ucsd.edu


Hi all,
     I am having issues using Cleanline (The current release), and I am
using EEGLAB 13_4_3b), while following (with minor adjustments) Makoto's
pre-processing pipeline (
http://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline).
     We have noticed a strange 20Hz artifact in some of subject's data and
want to use CleanLine to eliminate it rather than a traditional notch
filter for fear of creating a band hole at this frequency. The issue is
that, after some messing around with various solutions, I've noticed that
CleanLine only is effective at reducing noise at this frequency when I
apply it to epoched data, but not continuous, data, and I was wondering if
anyone has any idea on why this might be.
     I plan to remove bad channels using TrimOutlier, interpolate, and then
reference to the CAR prior to epoching, so I don't want to delay
referencing, channel removal, etc. until post-epoching for fear of
introducing all sorts of noise into my data. Any help on this would be
*much* appreciated, many thanks.

Chris Barkley
College of Pharmacy
University of Minnesota
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