MR-Eyetracker

In fMRI, the distribution of BOLD (blood oxygen level dependent) responses depend on the type of eye movement performed, so to reliably classify brain areas it is important to carefully measure the actual eye movements. Eye movements are either spontaneous in nature or they are visually guided. The latter fall into two general classes: saccadic eye movements which are ballistic and direct the fovea to a target or location of interest, and pursuit eye movements which are smooth continuous tracking movements, when the eyes follow a moving target.

Some conventional eye-trackers are not fast enough to distinguish different types of movement and most incorporate ferrous materials and electronics that are incompatible with magnetic environments. The MR-Eyetracker is a contact-free solution that is easy to operate and is designed specifically for use in fMRI: it uses fibre optics and has high spatial and temporal resolution easily capable of discriminating saccades and pursuit.

Main Features

• Designed specifically for oculomotor research in functional imaging environments
• Uses optically coupled remote sensing
• Sensors constructed from materials that do not affect functional imaging technique
• Wide bandwidth for accurate measurement of saccade dynamics
• Excellent DC stability
• Horizontal and vertical measurements in one eye
• Non-intrusive optics; the subject is minimally aware of the device
• Can be used in combination with the ViSaGe Visual Stimulus Generator and vsgEyetrace software for synchronised visual stimulation and data acquisition on a single PC

^ Back to top