ERP- Reference (Earlobe)

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tali
Posts: 3
Joined: Sat Oct 06, 2012 10:35 pm

ERP- Reference (Earlobe)

Post by tali »

Hi.
My lab purchase EEG (64 channels).
So... I did a simple experiment:
a tone (duration: 200msec, 70db, 1KHz) was repeated ~300 times.
Subjects were ask to close their eyes and count the number of tones.
After averaging, I get 2 clear peaks on the earlobes and mastoids: P1=~120msec, P2=~250msec
(mastoid, earlobes, and EOG were measure with PIN electrodes, EX1-EX8)

Thus, its seems wrong to reduce the earlobe or mastoids from the other channels...
any thoughts why I see this response on the earlobes?

BTW, I'm using analyzer 2.0, I tried to take the average of all the electrodes as reference.
Without reducing a "reference" I dont have ERP reponse...

Thanks

Tali

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