SubjectPreparation - Meg Wiki
CbuMeg: SubjectPreparation

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. The digitiser has a pen-like sensor that will record the location of its tip when the button is pressed.

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

CbuMeg: SubjectPreparation (last edited 2007-05-18 09:42:17 by MaartenVanCasteren)