[Eeglablist] re-referencing when online reference is a scalp channel

[Joseph Dien]

Just keep the 5Z channel.  Throwing it away is just losing data 
unnecessarily.  From an electrical engineering point of view, the 
recording reference isn't any different than any of the other 
electrodes.  It's just a matter of which one you've arbitrarily chosen 
to serve as the reference (to define zero voltage). Although I'm not 
familiar with the ANT system, so it's possible there are hardware 
idiosyncracies involved.

Dien, J. (1998). Issues in the application of the average reference: 
Review, critiques, and recommendations. /Behavior Research Methods, 
Instruments, and Computers/, /30/(1), 34–43. 
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Joe

On 3/25/25 11:06, Denise Dal Lago via eeglablist wrote:
> Hi all,
> I recorded EEG data using a 65-channel ANT Neuro cap with an online reference at channel 5Z (ANT Neuro labeling). I am now pre-processing the data in MATLAB with EEGLAB and need to re-reference to the common average. If I simply apply the re-reference, I will still have 65 channels with 5Z as an active channel. Should I remove the 5Z channel after re-referencing, or is it better to retain it? What would be the best practice in this case?
> I am more familiar with the Biosemi recording system, where I didn’t encounter this issue.
> Many thanks,
> Denise
>
>
>
> Denise Dal Lago, PhD
> Research Fellow
> Department of Psychology, University of Bologna
> Viale Berti Pichat, 5 -40127 Bologna, Italy
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Joseph Dien, PhD
Senior Research Scientist
Department of Human Development and Quantitative Methodology
University of Maryland, College Park
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