[Reducing cross-talk in electrooculograms made with several electrodes].
In order to discuss how to handle the contralateral effect (cross-talk) when taking an electrooculogram (EOG) with two or more electrodes, a forced duction test was used to detect cross-talk potentials. The cross-talk potentials originating from the left eye were measured at the right eye for 5 subjects when the left eye was adducted and abducted alternately with a suction contact lens while the right eye was kept fixed. The cross-talk potentials detected at the right eye did not depend on the electrode position, but the contralateral EOG potentials depended on the electrode position around the left eye. The cross-talk value is calculated as the gain, 20.log [(cross-talk potential)/(contralateral EOG potential)]. The denominator of this expression considerably affects the gain since the contralateral potential depends on the position of the electrode. We propose that the effect of the cross-talk on the potential between a pair of electrodes can be cancelled with the gain value (-15.0dB: the mean value for the 5 subjects) when the contralateral electrode is set 20 mm from the outer canthus.
Itsuki
N
N
Department of Electrical Engineering, Niihama National College of Technology, Ehime-ken, Japan.
Kubo
M
M
Nishikawa
Y
Y
Mimura
Y
Y
Nishihara
M
M
Minamoto
Y
Y
D004566:Electrodes; D004585:Electrooculography / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009799:Ocular Physiological Phenomena