Geodesic Sensor Net Technical Manual page 103

The main point to keep in mind is to apply the Net properly, by ensuring that the
orbital, vertex, nasion, and mastoid sensors are accurately placed and that the face
straps (chin strap, eye electrode bands, and ear electrode bands) are adjusted to
maximize subject comfort (see Chapter 6, "Applying the GSN," for step-by-step
instructions).
What should I do with eyeglasses?
Have the subject take glasses off and hold them (better than the technician taking the
subject's glasses, which can cause insecurity) during Net application.
After Net application, help the subject thread the glasses past the sponges and over
the ears. For the GSN 200, use small, saline-soaked sponge pieces to increase sensor
height where gaps exist.
Are there differences in how to apply the
HCGSN and GSN 200?
As described in Chapter 6, "Applying the GSN," the application procedure is almost
identical.
Both the GSN 200 and the HCGSN require:
• Stretching the perimeter band with your thumbs and little fingers so that it is
slightly larger than the subject's head.
• Standing directly in front of the subject to ensure a straight and even
application.
• Aligning the vertex and nasion electrodes with the vertex and nasion of the
subject.
• Maximizing the comfort of the subject by moving the eye and ear electrodes as
needed, and by adjusting the face straps (chin strap, eye electrode bands, and
ear electrode bands) until the desired fit is accomplished.
The few differences related to the HCGSN include:
• Ear cut-out sections : Be sure that the ear cut-out sections do not pin down the
ears, especially on the bottom edge.
• Y clip : Secure the Y clip to the subject's collar to relieve some of the strain on the
geodesic structure. (Exception: 32-channel model has no Y clip.)
Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007
10: Net FAQs
103