Glossary
143
Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007
preauricular point The indentation just
in front of the ear flap (pinna) where the
jaw meets the skull.
R
receptacle A fitting connected to a
power supply and equipped to receive a
plug.
reference An electrical point that is
treated as zero for purposes of
amplifying electrical signals. The
Geodesic Sensor Net has a reference
electrode located at the vertex.
S
sample When a continuous signal is
measured by examining it at discrete
moments in time, each measurement
corresponds to a sample.
sensor A device that picks up a signal
being generated by something in the real
world.
sensor layout Descriptive information
for a particular quantity and
arrangement of sensors. Includes 2D
and/or 3D coordinates specifying the
locations of sensors, labels (names) of
sensors, and connectivity. Such
information is stored in a sensor layout
file.
short To cause a short circuit in.
short circuit A low-resistance
connection between two points in an
electric current.
signal A detectable, measurable
quantity that can be expected to display
periodicity or other forms of variation in
time.
silver/silver chloride An electrode
material known for superior noise and
drift characteristics.
sintering The process of bonding either
a metal or powder by cold pressing it
into a desired shape and then heating to
form a strong cohesive body.
socket An opening or cavity into which
something fits.
sterilization The process of killing all
microbes in a material. Compare with
disinfection
.
T
tessellate To cover a surface with
interlocking patterns.
V
vertex The point on an EEG subject’s
scalp that is closest to the top of the
head. In the International 10-20 system,
Cz is the vertex electrode. In the Adult
128 GSN, electrode #129 is the vertex.
The point on the scalp or skull located
midway between the nasion and inion
and centered between the periauricular
points. Also the name of the Geodesic
Sensor Net sensor that corresponds to
this location and that contains the
reference electrode.
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