LiveTrack AV for fMRI is an affordable video eye tracking system which provides real-time estimates of eye rotation, direction of gaze coordinates and pupil size. A live video stream from the eye tracking camera is available concurrently with the data so you can visually monitor and check your observer’s behaviour throughout the experiment.
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Infrared Optical Path
By using an infrared sensitive camera and IR illumination, the eye tracker is able to operate in total darkness. The illumination source is mounted within the camera housing and positioned close to the eye. This helps to provide more robust tracking compared to remote solutions.
Shielded Copper Cable
The camera uses carefully shielded and filtered circuitry to isolate the video signal from the MR gradients and RF pulses.
Flexible Head Coil Clamps
A very flexible, articulated arm and plastic clamp that work with many birdcage/bar head coil designs is available. It is allows the camera to be sited in many locations, but often at the expense of being within the subject's field of view.
A full range of bespoke mounts are also available and are highly recommended; they include a cold mirror so that the camera can be positioned completely outside the subject's field of view. This optical design makes the setup for each observer fast and repeatable and provides the optimum optical alignment for robust tracking.
Dedicated Image Processing
A self contained image processing computer analyses the video signal and identifies the pupil and corneal reflection. The video image stream, tracked eye position and pupil size data are all returned to the host computer across a USB interface.
External Trigger Input
A separate TTL-compatible signal is recorded with the eye data for easy synchronisation.