This page lists techniques and measurements employed by
the eegPACK system.
eegPACK removable transmitters are attached to a head connector or housed in a cap during recording sessions, while physiological signals are radio-transmitted to a receiver within 3 to 5 meters distance.
Non-invasive options utilize your choice of electrode type (i.e. surface, needle, etc.) secured in place using headgear (i.e. custom cap, vet wrap, etc.).
Another option is to implant a head connector in the skull with detachable external transmitter.
A head connector is implanted in the skull and acts as an interface between the electrodes in the brain and the transmitter. The eegPACK transmitter may be plugged into and removed from the head connector as required. In this way, the same transmitter is usable on any subject equipped with a connector.
The EEG signal is retrieved through surgically implanted electrodes in the cortex, the hippocampus or any other area of the brain. Each signal requires 2 measuring electrodes (positive and negative) and a reference, which is common to all biopotential signals.
Up to 4 bipolar biopotentials can be recorded with eegPACK.
Surface Lead EEGs: Will It Stick? Ken Kearney et al. Poster. 2018
A 3-axis accelerometer inside the eegPACK measures the acceleration in the x-, y- and z-axis.
Any movement of the subject head translates in variations in the x, y, z coordinates of acceleration.
Using the three individual axis signals, IOX2 acquisition software calculates a global acceleration, making it possible to derive information about the animal’s posture (standing on hind legs, on its side etc).
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