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Size: 696
Comment:
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Size: 697
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 8: | Line 8: |
| to ther head. 2 will be on the forehead and 2 behind the ears. In addition we normally also attach 5 electrodes to the face to measure eye movements |
to their head, with 2 on the forehead and 2 behind the ears. In addition we normally attach 5 electrodes to the face as well to measure eye movements |
| Line 13: | Line 13: |
| measure 4 landmarks and a number of additional points on the head to indicate | measure 3 landmarks and a number of additional points on the head to indicate |
Subject Preparation
Subjects need to be free of magnetic materials, like coins, watches and other metal items. Underwired bras can be a problem, and even dyes in clothing or hairdye can cause interference.
To track head movements volunteers need to have 4 small coils attached to their head, with 2 on the forehead and 2 behind the ears. In addition we normally attach 5 electrodes to the face as well to measure eye movements and blinks.
The location of the coils needs to be measured with a 3D digitiser. We also measure 3 landmarks and a number of additional points on the head to indicate headshape and enable easier matching to an MRI structural scan.
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