[Eeglablist] re-reference to average from Cz

[Makoto Miyakoshi]

Dear Jerry,

> Should I include Cz when computing average?

No.

> I simply click "Tools | Re-reference | Computer average", leaving other
boxes empty.

Yes, that's the way to go.

If you want to recover Cz for any reason, do it after above steps. EEGLAB
allows users to do channel interpolation. In doing so, you need to prepare
a dataset that has Cz though.

Makoto

On Mon, Jun 16, 2014 at 4:59 PM, Jerry Zhu <jerryzhu at siu.edu> wrote:

> Hi all,
> My 128-channel data use Cz as the reference channel during collection. I
> wanna re-reference to average. Should I include Cz when computing average?
>
> If not, I simply click "Tools | Re-reference | Computer average", leaving
> other boxes empty. After that I got a file with 128 channels.
>
> If yes, I declare Cz as the reference through the GUI "Edit | Channel
> location | Set reference". Then in "Tools | Re-reference | Computer
> average" I also "add current reference channel back to data". After that I
> got a file with 129 channels (including the Cz).
> (a side-note, I also found that I can skip the step of declaring Cz as
> reference and directly add Cz back to data in "Tools | Re-reference |
> Computer average". So is setting a reference channel necessary to begin
> with?)
>
> Which way is "correct" or "preferred"?
> --
> Jian Zhu, M.A.
> Brain and Cognitive Sciences
> Department of Psychology
> Southern Illinois University Carbondale
> Web: http://zhupsy.com
>
> We have two halves in the brain: left and right. Nothing is right in the
> left. Nothing is left in the right.
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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