[Eeglablist] how to not lose the reference channel

[Stuart McGill]

Dear Giulia,

In EEGLAB (v11.05) you can return the reference electrode back into the
data during the average re-referencing in the bottom box of the pop up
window. However, I am not sure if this function is available in the latest
version of EEGLAB.

Hope this helps
Stuart McGill


On Tue, Jul 23, 2013 at 7:58 PM, Rampone, Giulia <
Giulia.Rampone at liverpool.ac.uk> wrote:

>  Dear Makoto,
>
>  Thank you very much for your response. I apologise for being insistent
> but I still have a question.
> Assuming I accept interpolation as the only solution, I do not have clear
> how to do.
> I usually don't use the GUI. I do the interpolation for bad channels by
> using the command pop_Interp(EEG, [channel], 'spherical').
> However, this works fine if the (bad)channel exists.
> But in this particular case, Cz is removed from the data.
> Once I set Cz as reference electrode, I move from 64 to 63 electrodes and
> channel 48 (which is usually Cz) becomes C2.
>
>  My question is, what I should add to the command in order to restore the
> Cz channel as channel 48 (even though as interpolated channel) and go back
> to 64 channels?
>
>  I hope this makes sense.
>
>  Many thanks
>
>  Giulia
>
>  On 22 Jul 2013, at 19:38, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>
>  Dear Giulia,
>
>  After average referencing you can interpolate the channel to generate
> your reference channel from main GUI 'Tools' - 'Interpolate electrodes'.
> You need to have a dataset before rereferencing though to copy its channel
> info.
>
>  Makoto
>
>
> 2013/7/21 Rampone, Giulia <Giulia.Rampone at liverpool.ac.uk>
>
>> Dear all,
>>
>> I have Biosemi BDF data file.  64 Channels and reference channel Cz.
>> My problem consists in retaining the reference channel in my data.
>> The older version of eeglab9_0_4_5s does that by default.
>> The version 11_0_4_3, instead, seems to separate the reference electrode
>> from the others and, after computing the average reference, to definitively
>> remove it.
>> I would like to know what I would be supposed to do to retain the
>> reference channel in my data with this version.
>>
>> I thank you very much for any help,
>>
>> Best Regards
>>
>> Giulia
>>
>> Giulia Rampone, PhD student
>> School of Psychology
>> Eleanor Rathbone Building
>> University of Liverpool
>> Bedford Street South
>> Liverpool L69 7ZA
>>
>> cell  0044 7449301514
>> e-mail giulia at liverpool.ac.uk
>> e-mail giuliarampone at gmail.com
>> skype giulia.rampone
>>
>>
>>
>>
>>
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>
>
>
>  --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
>
>
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