1) A front surface mirror, which allows a sitting up monkey to view a projection screen placed above him/her in the contect of a vertical bore scanner such as a Bruker 4.7T.
2) Filters for each eye (e.g. anaglyph, polarizing, or INFITEC (
www.infitec.net/) ), through which the monkey will view the images projected by a dual projector stereoscopic display.
3) Hot mirrors at a 45 degree angle, located between the eyes and the filters. These mirrors will reflect infrared light to the eye tracking camera(s) while allowing visible light to pass through to the monkey's eyes (
www.edmundoptics.com/optics/optical-mirrors/specialty-mirrors/hot-mirrors/1492).
4) MRC's MR-compatible infrared eye-tracking cameras (
www.mrc-systems.de/englisch/products/mrcamera.html), with IR LEDs for illumination. These cameras are housed at the sides of the goggle enclosure, and capture the eye position of the monkey through the reflection of infrared light in the hot mirrors.
This design is intended to be mounted to the front of an MR-compatible primate chair via a stand (X). It is adjustable in Y and Z dimensions (in radiological coordinates), via the use of nylon screws (
www.mcmaster.com/#=tefecp). Several iterations of this design have been 3D-printed and tested in the scanner with great success.