[Eeglablist] EEG reference BioSemi system

[Tarik S Bel-Bahar]

With biosemi, with 128 channels, you could consider  using  an average
reference, which is defendable for a high density net, if you have no other
way or option  to reference.

You should also check what the lab that has recorded the data has done
before, and the manufacturer's specific recommendation for referencing.

Usually biosemi has two or more external EXG electrodes, which we record,
and  are told by biosemi to reference to.

If you find a solution that works for you please pass it on to the eeglab
list.

For theory on re-referencing, check google scholar first , or any erp/eeg
handbook should help you, such as the book from Luck or from Handy.




On Jan 10, 2012 10:39 AM, "Estelle Longin" <estellelongin at gmail.com> wrote:

> Dear collegues,
>
> I am new in EEG analyses so I apologize if my question seem trivial.
> I am working on data recorded with a 128 high-density cap (BioSemi
> system); no specific reference electrode was used during the recording.
> I am wondering what is the best reference to choose with the software. I
> understood that the usual EEG reference selections are 1 electrode on top
> of the head (Cz), or the average of all connected electrodes... Someone
> could tell me what these two methods implies, how they differ and if one
> method is better than the other ?
>
> Thank you in advance.
>
> Best regards,
> Estelle Longin
>
>
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