High Density Array Electroencephalogram (EEG)
Our High density array electroencephalogram (EEG) setup includes Geodesic Sensor Net, Net Amps200, Net Station software and Geodesic Photogrammetry System (GPS) from EGI.
1.Geodesic Sensor Net
We use the water electrolyte based sensor nets with pedestal sponge. The sensory net is used to pick up current from the scalp. We have three dense-array 256-channel nets (small 53.5-55cm, medium55.5-58cm and large58.5-61.5cm) for adults and two 128-channel nets (small47-48cm, large48.5-50cm) for children from 1-3 years old.
2.Net Amps200
This is the amplifier that amplify the small current on scalp (usually a few mV voltage) to some voltage strong enough to be readable by the computer. The sample rate is up to 1,000 samples per second per channel. The scalp impedances of electrodes range from 10K to 50K. If the scalp impedance is over 50K, we can deal with that when using Net Station.
3.Net Station software
Net Station is an extensible acquisition and analysis environment for use with the Net Amps and Geodesic Sensory Net. It includes the three main features---Acquisition, Review, and Analysis. If you are interested in this software and want to know the details, you can check the EGI website.
4. Geodesic Photogrammetry System (GPS)
It builds on the fast application of the Geodesic Sensor Net and the streamlined workflow of Net Station to make sensor registration easy, both for the subject and the technician.
This is the picture of our setup:
