Geodesic Sensor Net - Page 27

1: GSN Introduction
27
Geodesic Sensor Net Technical Manual S-MAN-200-GSNR-001 • January 31, 2007
The Net sensors pick up changes in voltage originating at the surface of the subject’s
head (the EEG), along with a certain amount of electrical noise originating in the room
environment. Electrical signals from all the sensors of the Net are received
simultaneously by the amplifiers where they are amplified, filtered, sampled, and
digitized. As quickly as the samples are acquired, they are packaged and sent to the
data-acquisition computer along the Universal Serial Bus (USB) cable (or in the case of
the Net Amps 300, the FireWire cable) that connects the amplifier and the data-
acquisition computer.