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Evaluating Tests of Cognition using a Computerized Touch-Sensitive Tablet, Eye Tracking, and Functional Magnetic Resonance Imaging
Published on: January 30, 2026
A novel functional magnetic resonance imaging compatible search-coil eye-tracking system
Axel Oeltermann1, Shih-Pi Ku, Nikos K Logothetis
1Max Planck Institute for Biological Cybernetics, 72076 Tuebingen, Germany. axel.oeltermann@tuebingen.mpg.de
Magnetic Resonance Imaging
|May 8, 2007
Summary
This study introduces a novel, MRI-compatible search-coil eye tracker. This device offers superior spatial and temporal resolution for precise eye movement measurement during functional MRI scans.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Ophthalmology
Background:
- Search-coil eye-tracking offers superior precision over video-based methods.
- Conventional search-coil trackers are incompatible with functional magnetic resonance imaging (fMRI).
- Challenges include electromagnetic interference and space limitations within MRI scanners.
Purpose of the Study:
- To develop and validate an fMRI-compatible search-coil eye tracker.
- To overcome technical hurdles of integrating search-coil technology into MRI environments.
- To enable precise eye movement monitoring during fMRI studies.
Main Methods:
- Developed an fMRI-compatible search-coil eye tracker by integrating transmitter coils into the visual presentation system.
- Designed a portable control/analysis unit for seamless integration with MRI scanners.
- Tested the system for noise, artifacts, and radiofrequency pulse-induced heating.
Main Results:
- The system achieves high spatial (0.07 degrees) and temporal (22 kHz) resolution.
- Recorded eye traces exhibited low noise and minimal scanning artifacts.
- No measurable heating was detected in the search coil due to RF pulses.
Conclusions:
- The developed MR-compatible search-coil eye tracker precisely monitors eye movements during fMRI.
- This technology is crucial for studies demanding accurate target fixation and oculomotor system analysis.
- Enables advanced research in neuroscience and ophthalmology using fMRI.
