[Eeglablist] how to not lose the reference channel

[Makoto Miyakoshi]

Dear Stuart and Giulia,

Stuart is absolutely right, there is an option for that. Thanks Stuart.

You should be able to interpolate missing channel by comparing the two
datasets that are with and without the channel to be interpolated.

Why don't you try GUI before posting a question? After operating what you
want successfully, you can obtain the log by 'eegh'.

Makoto


2013/7/23 Stuart McGill <stu22.mcgill at gmail.com>

> 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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>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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