[Eeglablist] zapline inquiry

[Cedric Cannard]

Dear Brian,

Have you tried different parameters? 

You can also try the CleanLine plugin. 

Alternatively, you may apply a band-pass filter (e.g., 45-55) with EEGLAB's default zero-phase noncausal FIR filter, with a high filter order (e.g., >1000). 

Hope this helps,

Cedric Cannard

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------- Original Message -------
On Tuesday, June 6th, 2023 at 8:28 AM, Kavanaugh, Brian via eeglablist <eeglablist at sccn.ucsd.edu> wrote:


> Hi everyone,
> 
> We are working with a great, publicly available dataset. The line noise at
> 50 hz is quite strong, and seems to be giving zapline-plus some trouble.
> 
> zapline either can't remove it fully, or seems to distort the overall curve
> of the signal. images below, including the original and attempts with
> zapline. we are using the 'line' option.
> 
> i've tried putting zapline before and after either filtering and clean_raw,
> but still seems to be having trouble. we are interested in gamma activity,
> which certainly makes this a bit tricker than just filtering < 50.
> 
> curious if others have some tricks or suggestions!
> 
> Brian
> 
> [image: image.png]
> 
> Brian Kavanaugh, Psy.D., ABPP
> 
> Board Certified in Clinical Neuropsychology, Pediatric Subspecialist
> 
> Pediatric Neuropsychologist, E. P. Bradley Hospital
> 
> Assistant Professor, Warren Alpert Medical School of Brown University
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