The Hcgsn Features Red Pedestals For The Nasion And Cardinal Points; 32-Channel Hcgsn; 64-Channel Gsn 200; Chapter 2 Hcgsn - Geodesic Sensor Net Technical Manual

° Locate the back of the Net (this is where the wires exit the sensor array for the
Place your hands underneath the face straps and hold the GSN so that you are
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touching the underside of the Net (in other words, your hands are in contact
with the pedestal feet).
Locate the nasion sensor (which is colored in both the GSN 200 and the
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HCGSN), which is situated on a multistring perimeter band , one of the strongest
parts of the Net.
On either side of the nasion, count two electrodes out and hook your thumbs
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underneath the strings of the perimeter band (Figure 6-8). (Note: if you are
applying a 256-channel Net, you should count three electrodes out.) Table 6-1
lists the correct thumb positions for various sensor densities.
GSN number of channels

32-channel HCGSN

64-channel HCGSN
128-channel HCGSN
256-channel HCGSN

64-channel GSN 200

128-channel GSN 200
256-channel GSN 200
* Figure B-1 on page 123 shows proper thumb placement for the 32-channel HCGSN.
** Figure B-2 on page 124 shows proper thumb placement for the 64-channel HCGSN.
Geodesic Sensor Net Technical Manual
Figure 6-7; cardinal sensors are located at the vertices of the major triangles
and used in EGI's Geodesic Photogrammetry System).
Figure 6-7. The HCGSN features red pedestals for the nasion and cardinal points
HCGSN).
Table 6-1. Thumb placement when applying Net
between sensor numbers:
unnumbered sensors*
17 and unnumbered sensor**
S-MAN-200-GSNR-001 • January 31, 2007
Left thumb
between sensor numbers:
1 and unnumbered sensor**
1 and 8
1 and 10
1 and 60
1 and 8
1 and 10
6: Applying the GSN
Right thumb
unnumbered sensors*
25 and 32
46 and 54
14 and 19
26 and 33
45 and 53
65