Geodesic Sensor Net - Page 141

Glossary
141
Geodesic Sensor Net Technical Manual S-MAN-200-GSNR-001 • January 31, 2007
of elastomer lines in the approximation
of a geodesic.
Geodesic Sensor Net Electrical
Geodesics Inc.’s dense sensor array.
glabella The part of the frontal bone
between the eyebrows.
ground A large conducting body (e.g.,
as the earth) used as a common return
for an electric circuit and as an arbitrary
zero of potential.
GSN See
Geodesic Sensor Net .
GSNIC Geodesic Sensor Net interface
cable. See
interface cable .
H
HydroCel CleanLeads® The HCGSN
electrode leads, which feature a Teflon-
core coaxial design to minimize noise.
HydroCel Electrolyte Delivery
Systems® EGI’s family of electrolyte
solutions, which include HydroCel
Saline, HydroCel ES, and HydroCel HS.
HydroCel ES EGI’s glycerol-based
electrolyte solution for 8-hour
recordings with an HCGSN with sponge
inserts.
HydroCel Geodesic Sensor Net® EGI’s
third-generation of Geodesic Sensor Net,
featuring die-cut geodesic structure,
carbon-fiber electrodes with HydroCel
CleanLeads® technology to minimize
noise, low-profile design, and HydroCel
Hydrating Skin Interface Chamber®.
Often referred to as
HCGSN .
HydroCel HS EGI’s hydrogel-based
electrolyte solution for 12-hour
recordings with an HCGSN without
sponge inserts.
HydroCel Hydrating Skin Interface
Chamber® Proprietary pedestal design
featuring a chamber with a soft, flexible
plastic foot. This creates a sealed micro-
environment for hydrating the skin and
interfacing it with the electrode surface.
HydroCel Saline EGI’s classic
potassium chloride saline electrolyte
solution for 2-hour recordings with a
GSN or an HCGSN with sponge inserts.
I
icosahedra A polyhedron having 20
faces.
impedance The alternating current
equivalent of resistance, impedance is
the measurement of the resistance to the
flow of electricity for a particular
substance. Electrode/scalp impedances
affect waveform susceptibility to
environmental noise.
infraorbital Below or beneath the eye
socket.
inion Protuberance on the midline of
the occipital bone at the base of the
skull, below which the skull curves
inward to the
foramen magnum (the
opening through which the spinal cord
enters the brain).