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[–] thuvia_1 [S] ago 

The headset has a number of sensors built in. There's an EEG, or electroencephalography sensor, which measures electrical activity in the brain. There's an EOG, or electro-oculography sensor that measures eye movements by monitoring the electrical potential between the front and back of the human eye. There's an EMG, or electromyography sensor, that measures electrical activity in response to a nerve's stimulation of muscles. It also has gyros and accelerometers, and patented gear built in to amplify signal and squash noise from the finicky brain and nerve sensors.