[Eeglablist] When to perform re-reference?
mmiyakoshi at ucsd.edu
Wed Jun 18 16:56:14 PDT 2014
On Wed, Jun 18, 2014 at 3:45 PM, Jerry Zhu <jerryzhu at siu.edu> wrote:
> Hi Makoto,
> Thank you again for your reply.
> Did you mean "averaging AFTER removing bad epoches" in your sentence "you
> should apply average referencing AFTER removing bad channels."?
> So here are my processing:
> 1) re-reference (from Cz to average in my case)
> 2) remove bad epoches
> 3) interpolate bad channels
> 4) ICA
> Sounds like you would recommend the order: 2143?
> Looking forward to your and others inputs!
> Thanks all!
> 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.
> On Wed, Jun 18, 2014 at 1:38 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
>> 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 (
>>> 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!
>>> 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
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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