[Eeglablist] Cz reference in EGI files while import

Joseph Dien jdien07 at mac.com
Mon Oct 14 10:00:32 PDT 2019

not sure if I understand your question, but if Cz is indeed the reference channel it should indeed be flat (be definition) and you’ll need it to be there when you rereference to average reference otherwise you won’t have Cz and the computations for the rest of the channels will be incorrect.  Is there some reason that having Cz be present is preventing you from proceeding with your bad channel corrections?


> On Oct 14, 2019, at 05:28, Satya G PSYCHOLOGY <satya.g at christuniversity.in> wrote:
> Dear list members,
> In our lab we have a 64 channel EGI cap that we use to record EEG data.
> When I import the .mff data using the the latest
> mffimporter plugin, mffmatlabio v2.02, I get the data that is referenced to
> Cz automatically. Is there any way I can remove the reference because the
> Cz is flat completely? I want to see all the bad channels and remove them
> before computing average reference because bad channels in the data can
> contaminate the referencing part.
> I do see that the eeglab's sample data gets imported with an unknown
> reference. Is this a problem with EGI files? Can I have that unknown
> reference back for the EGI files that I work with?
> Satya G
> Lab Associate,
> NeuroCognition Lab,
> Christ (Deemed to be University),
> Bengaluru, India
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Joseph Dien, PhD
Senior Research Scientist
Department of Human Development and Quantitative Methodology
University of Maryland, College Park
E-mail: jdien07 at mac.com
Cell Phone: 202-297-8117

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