Electrooculography (EOG)
User Manual
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2.
Application Notes
The biosignalsplux EOG is designed to be used in, essentially, two configurations that may be
combined. Given its bipolar configuration, the measured signals correspond to the differential
between two electrodes given the reference electrode. The relative positioning of the two electrodes
(positive and negative) allows to infer about the eye movements, specifically, vertical or horizontal
movements.
2.1.
Reference Electrode
For the positioning of the reference electrode, it is recommended to be placed in an electrically neutral
spot in the body. For the EOG, it is common to place it as in Figure 4.
Figure 4 - Placement of the reference electrode.
To measure vertical eye movements, the electrodes should be positioned as illustrated in Figure 5. This
positioning allows the measurement of the difference of the potential between the above position and
under position of the eye, thus being indicated to measure the movements in that axis.
