[Eeglablist] When to perform re-reference?

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed Jun 18 11:38:16 PDT 2014

Dear Jason,

I remember you said that average reference should be applied before ICA,
but I did not understand exactly why. Could you comment on this?

Jerry, you should apply average referencing AFTER removing bad channels.

I don't think it makes big differences between average referencing before
or after interpolation. However we don't necessarily recommend
interpolation before ICA.


On Tue, Jun 17, 2014 at 12:20 PM, Jerry Zhu <jerryzhu at siu.edu> wrote:

> Hi all,
> At which stage do you re-reference your data? It was suggested do re-ref
> before ICA (http://sccn.ucsd.edu/pipermail/eeglablist/2011/003795.html).
> How about re-ref before/after bad epochs rejection and bad channel
> interpolation? The note here  (
> ftp://ftp.egi.com/pub/documentation/technotes/SplineInterpolation.pdf)
> suggests after interpolation. ("Since the interpolated potentials can be
> used to better approximate the average reference (Junghofer et al., 1999),
> it may be somewhat advantageous to compute the interpolated potentials
> directly from the measured data, in which case the voltages below are best
> thought of as referring to these measured potentials")
> What is your experience? Thanks for your sharing and suggestions!
> Jerry
> --
> 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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