[Eeglablist] Biosemi reference- Re reference?

[Arnaud Delorme]

Dear Laura,

yes this is redundant. In any case, if you rerefence to the Mastoid when importing BIOSEMI data, the mastoid channel will be 0 (although it will be removed by the function that imports BIOSEMI data so you will not see that channel). So if you were to re-reference to that channel again, 0 would be removed from all data channels (in other words nothing would happen).

Now, if you reference to linked mastoid, the BIOSEMI function will keep the data channels - the two mastoid channels (note that this is a recent fix as the old function was removing such channels). If you were to reference again to these two channels, the data would be unchanged.

Thanks,

Arno

On 26 Feb 2013, at 21:20, Laura Kaczer wrote:

> Hi all,
> Sorry for the basic question:
> -When importing a Biosemi file, it is required to specify a certain
> reference, so I chose the linked mastoids. However, it is not clear to me
> whether this step is the same as Re-referencing all channels to mastoids.
> In the EEEGLAB window, it says "Reference: unknown", and from this I
> assume the data is still not referenced.  So, if I want to re-reference,
> do I have to choose the same reference that I used when importing the
> Biosemi data? Or is it redundant?
> 
> Many thanks in advance!
> Laura
> 
> 
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