Electroencephalography (EEG)
User Manual
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2.
Application Notes & Electrode Placement
The biosignalsplux EEG is primarily designed for single-lead EEG acquisitions. For conventional EEG
data acquisitions, electrodes are placed according to the 10-20 system to measure the electric
potentials from the skin. The potential differences are measured between each electrode and a
reference electrode whereas in bipolar recording such as the one existent on PLUX’s sensors, the
potential difference is measured between adjacent electrodes. Hence when using a single
biosignalsplux EEG sensor with two electrodes, one needs to decide on one specific electrode position
of the 10-20 system relating to the desired brain region for data acquisition.
Example:
•
Electrode I:
FP1
–
forehead
•
Electrode II:
FP2 - forehead
•
Electrode III:
M1
–
mastoid process (behind ear)
The illustrations shown in Figure 4 and Figure 5 illustrates the recommended electrode placement
for the acquisition of neural activity in the prefrontal lobe.
Figure 4: Electrode placement on the forehead
Figure5: Electrode placement of reference electrode
for EEG acquisition in 10-20 system configuration
for EEG acquisition in 10-20 system configuration
After placing the EEG electrodes correctly on the skin, connect the electrode cables of the EEG sensor
according to one of the following configurations:
Table 1: EEG sensor electrode and electrode placement connection.
Positive Electrode (+)
(red sleeve)
Negative Electrode (-)
(black sleeve)
Reference Electrode
(white sleeve)
I
FP1
FP2
M1
II
FP2
FP1
M1
