6: Applying the GSN
71
Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007
To retain any changes made, hold the bands firmly while moving the cord
locks.
7
Ask the subject to look straight ahead. Adjust the tension on these lines until
the infraorbital sensors fall directly below the pupils (roughly over the
infraorbital foramen) and the extraorbital sensors fall just to the side of the
outside corner of the eye (roughly over the frontal process of the zygomatic
bone, or
cheekbone
). Adjust the orbital sensors by sliding them along the bands.
Verification and Additional Adjustments
1
Make sure that gross placement of the Net is correct. Four color-coded sensor
locations (including the vertex, nasion, and mastoids) help in verifying
placement and symmetry.
2
Check that a straight line of electrodes mark the center of the back of the head.
3
Check lateral symmetry by confirming that the mastoid sensors fall at the same
location behind each ear (Figure 6-17).
Figure 6-16. Adjust the orbital straps (128-channel HCGSN)
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