Geodesic Sensor Net Technical Manual page 140

Glossary
signals, the measure is –20 log
A ratio of 1/1,000, for example,
corresponds to –60 dB.
dense (sensor) array Any (sensor)
system that supports a sufficient
number of sensors to spatially sample a
phenomenon adequately. For EEG
recording, this generally means 64
channels or more.
disinfection The process of removing
most microbes from a material (compare
with sterilization ). The actual
effectiveness of disinfection varies with
the disinfection materials, thoroughness
of the procedure, and susceptibility of
the microbes to the disinfection protocol.
drift The change in a signal's offset
over time, or the amount by which a
signal's offset changes with time.
E
EEG See electroencephalography .
elastomer Any of various polymers
having the elastic properties of natural
rubber.
electrical field A field or force that
exists in the space between two different
potentials or voltages. Also known as an
electrostatic field.
electroencephalography science of
recording and analyzing the electrical
activity of the brain.
electrolyte Electrically conducting
liquid (wet) or paste (dry).
140
electrostatic discharge The transfer of
(A /A ).
10 0 1
an electrostatic charge between bodies at
different electrostatic potentials
(voltages), caused by direct contact or
induced by an electrostatic field.
ERP See event-related potential .
ESD See electrostatic discharge .
event-related potential An EEG
waveform elicited by a stimulus such as
an auditory or visual event.
extraorbital To the side of the eye
socket.
F
Faraday cage A grounded enclosure
made of conductive material.
Instrumentation positioned inside such
a cage will acquire some immunity to
signals such as line noise that originates
outside the cage.
Finder On Macintosh computers, the
Finder is the program that keeps track of
files and folders and displays the
desktop (the working area on the screen
with disk icons, a Trash icon, and so on).
foramen An aperture or perforation
through a bone or a membranous
structure.
G
geodesic The shortest distance between
two points on the surface of a sphere.
The Geodesic Sensor Net is a structure
Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007