Diff for "SubjectPreparation" - Meg Wiki
location: Diff for "SubjectPreparation"
Differences between revisions 1 and 10 (spanning 9 versions)
Revision 1 as of 2007-05-16 15:32:36
Size: 694
Comment:
Revision 10 as of 2007-05-18 09:40:34
Size: 762
Comment:
Deletions are marked like this. Additions are marked like this.
Line 7: Line 7:
To track head movements volunteers need to have 4 small coils attached
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 track head movements volunteers need to have 4 small HPI (Head Position Indicator)
coils attached to their head: 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 12: Line 12:
The location of the coils needs to be measured with a 3D digitiser. We also
measure 4 landmarks and a number of additional points on the head to indicate
The location of the coils needs to be recorded with a 3D digitiser. We also
measure 3 landmarks and a number of additional points on the head to indicate
Line 16: Line 16:
attachment: [[ImageLink(jason_subject.jpg,//CbuMeg, height=400)]]

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 HPI (Head Position Indicator) coils attached to their head: 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 recorded 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.

ImageLink(jason_subject.jpg,//CbuMeg, height=400)

CbuMeg: SubjectPreparation (last edited 2015-03-23 12:34:22 by OlafHauk)