SR Research
Fast, Accurate, Reliable Eye Tracking
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Neuroimagining: fMRI and MEG

Researchers are increasingly aware of the benefits of simultaneously recording gaze while acquiring fMRI and MEG data. Eye tracking allows researchers to monitor participant engagement and task-compliance, track and control for potentially confounding factors such as saccades, microsaccades and blinks, and employ advanced analytical techniques such as fixation-related (FIRE) fMRI. In addition, eye tracking allows stimulus presentation during scans to be controlled in a gaze-contingent manner, greatly increasing the range of perceptual and cognitive operations that can be explored.

Why EyeLink?

More EyeLink eye trackers have been installed in MRI and MEG systems worldwide than any other system. They are the eye tracker of choice for many reasons:

Exceptional Performance:

  • Outstanding spatial accuracy
    • EyeLink systems average accuracy in the scanner environment is between 0.25-0.5 visual angle.
    • This is an order of magnitide more accurate than any other MRI eye-tracker.
  • Easy Set-Up
    • A simple "Point, Focus, Click" procedure between subjects ensures that scanning time is not wasted.
    • Easy set-up and removal between scan sessions
  • Clean Data
    • Ferromagnetically optimized components ensure no artefacts are introduced into fMRI / MEG recordings
  • High sampling rates
    • All new EyeLink systems are capable of sampling at up to 2000Hz monocularly and (in MRI depending on the head coil) 1000Hz binocularly

Flexibility:

  • Multi-Purpose: The same camera can be used in MRI, MEG and standard behavioural laboratory environments
    • Standard solutions exist for at least:
      • Siemens Prisma, Trio, Skyra, Verio, Philips Achieva, Ingenia, GE 750, 750w and Bruker MRIs at 3T, 7T, and even 10.5T with at least 8, 12, 20, 25, 32 and 64 channel head coils from all manufacturers
      • 4D, CTF, Elekta Neuromag and other MEGs
  • Unobtrusive: A long range mount supports camera-to-eye distances of 60 - 150 cm with non-visible infrared possible.

Intuitive Software:

  • Easily Integrated Software
    • Eye tracking functionality can easily be added to existing fMRI / MEG tasks.
    • Remotely control and interact with the eye tracker through your task.
    • The freely available API for Windows, OS X and Linux includes examples for:
      • MATLAB via Psychtoolbox,
      • NBS Presentation,
      • E-Prime
      • Python
      • Labview
      • Any standard programming language
    • Experiment Builder, our own experiment delivery software, is an intuitive graphical programming environment that is simple for novice users to learn quickly, yet sophisticated enough to handle advanced experimental paradigms.
  • EyeLink Data Viewer
    • EyeLink Data Viewer allows visualization, filtering, and processing of gaze data recorded with EyeLink eye trackers. Researchers can create interest areas, dynamic heatmaps, time series analyses, and very quickly derive key measures such as dwell time and average fixation duration.

Outstanding Support:

Our support service spans two continents, and all our support staff have extensive expertise in all aspects of eye tracking research, and are very experienced at installing systems in MRI and MEG settings. We can assist in ensuring that existing stimulus display software and tasks can be integrated both with the timing pulses provided by the scanner, and the eye-tracking recording equipment, ensuring that both data streams are synchronised.

For a personalized consultation or quotation, including special solution bundle pricing, please contact us.