[Eeglablist] Re-Referencing Question

[Ramesh SRINIVASAN]

Johannes -

I was definitely not implying that this is a better idea than mathematical
rereferencing to linked ears (which is the MUCH easier idea to implement).

But, if you really want to physically linked ears and achieve a balanced
reference, balancing the impedance of the two ear contacts will influence
the outcome.

Ramesh Srinivasan
Assistant Professor
Department of Cognitive Sciences
University of California, Irvine
Irvine, CA 92697-5100
(949) 824-8659
FAX 949-824-2307

On Fri, 13 Jun 2003, Sarnthein Johannes wrote:

> Ramesh,
>
> > Nunez PL (1981) Electric Fields of the Brain Oxford chapter 6.
> Unfortunately I cannot access the book.
>
> > The best thing to do would be to place two resistors between the ears
> > and reference to the point on the wire between them.
> Do you actually use a device with a resistor between the ears?
> What size of resistors do you use? 5kOhm?
> What about the frequency dependence of the impedance?
> Why would you think this device is better than rereferencing to Ai/2?
>
> Johannes
>
>
> Johannes Sarnthein
> Funktionelle Neurochirurgie
> Universitätsspital Zürich
> Sternwartstrasse 6                   tel +41 1 255 2179
> CH-8091 Zürich                       fax +41 1 255 8946
> www.nchusz.unizh.ch/forschung_stereo.htm
>