Electroencephalography (EEG)
User Manual
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1.
General Information
1.1.
General Description
Our electroencephalography (EEG) sensor has been especially designed for both classic and localized
EEG measurement. When a cap is too intrusive, only a limited number of channels are needed. The
bipolar configuration, with two measurement electrodes detects the electrical potentials in the
specific scalp region with respect to a reference electrode, which should be placed in a region of low
muscular activity. The resulting signal is the amplified difference between these two signals,
eliminating the common unwanted signals detected by the surfaces. Its convenient form factor enables
a discrete placement in regions such as the forehead, occipital, and others.
This sensor can be used to extract neural activations of specific brain regions as well as other EEG
features, enabling its application in research fields such as neurophysiology, neurofeedback,
psychophysiology, and human-computer interaction, among many others.
Figure 1: biosignalsplux Electroencephalography (EEG) sensor (standard version).
1.2.
Typical Unfiltered Sensor Output
Figure 2 shows a typical unfiltered EEG sensor output acquired while at rest. The raw digital sensor
values received from the biosignalsplux device ranged between 0 and 2
n
-1 (n=sampling resolution)
were converted into the original unit of measurement of this sensor (µV) using the transfer function
found in section Transfer Function (Conversion Formula).
Figure 2: Typical unfiltered EEG sensor output (signal acquired while at rest).
