[Eeglablist] Enquiry regarding bandpass using eegfiltnew

[#HENG JIAMIN GLADYS#]

Dear John,

Thanks for the reply. From the GUI, we need to input values for lower edge of the frequency pass band and higher edge of the frequency pass band.

>From my understanding based on eegfiltnew help text, lower edge of frequency pass band corresponds to lowpass (which would be 30 Hz in my case), and higher edge of the frequency pass band corresponds to highpass (which would be 1 Hz in my case).

However, I also came across the youtube video of eeglab filtering (https://www.youtube.com/watch?v=nshi47blz7Q), at about 3:02 min, it was shown that the high-pass value of 0.5 Hz is input to "lower edge of the frequency pass band". My confusion is with this - shouldn't it be input under "higher edge of frequency pass band", or perhaps I have some misunderstanding of this function?

Dear Benedikt,

Thanks also for the recommendation of separating low and high-pass filter. By "the filter-order can then be different per filter", could I ask if there are recommended filter-order for each of the filters?

Regards,
Gladys
________________________________
From: John Johnson <john.johnson at gatech.edu>
Sent: Monday, April 6, 2020 8:39 PM
To: #HENG JIAMIN GLADYS# <JHENG007 at e.ntu.edu.sg>
Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
Subject: Re: [Eeglablist] Enquiry regarding bandpass using eegfiltnew


Probably the easiest way is to use the EEGLAB GUI to filter a dataset, then use the eegh command to see how the call to pop_eegfiltnew was made.

Regards,
John

On 4 Apr 2020, at 9:05, #HENG JIAMIN GLADYS# wrote:

Dear EEGlab list,

I would like to apply a 1 – 30 Hz bandpass filter on my data.

I am using the pop_eegfiltnew function, and would like to double-check if this code has the right input:
EEG = pop_eegfiltnew(EEG, 30, 1, 660, 0, [], 1);

As the inputs are (EEG, locutoff, hicutoff, filtorder, revfilt, usefft, plotfreqz, minphase), therefore locutoff is “30” and hicutoff is “1”.

Thanks a lot in advance!

Stay safe and healthy,
Gladys
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