Itsuki N, Kubo M, Nishikawa Y, Mimura Y, Nishihara M, Minamoto Y
Department of Electrical Engineering, Niihama National College of Technology, Ehime-ken, Japan.
Nippon Ganka Gakkai Zasshi. 1994 Mar;98(3):251-7.
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.
为了探讨在使用两个或更多电极进行眼电图（EOG）检测时如何处理对侧效应（串扰），采用强制牵拉试验来检测串扰电位。当右眼保持固定时，使用吸盘式隐形眼镜使左眼交替内收和外展，对5名受试者在右眼测量源自左眼的串扰电位。在右眼检测到的串扰电位不依赖于电极位置，但对侧眼电图电位依赖于左眼周围的电极位置。串扰值计算为增益，即20·log[（串扰电位）/（对侧眼电图电位）]。由于对侧电位依赖于电极位置，该表达式的分母对增益有很大影响。我们建议，当对侧电极设置在距外眦20 mm处时，串扰对一对电极之间电位的影响可以用增益值（-15.0dB：5名受试者的平均值）消除。
