Eye-tracking with MEG
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1
University College London, United Kingdom
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2
Otto-von-Guericke University, Department of Neurology, Germany
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3
University College London, Wellcome Trust Centre for Neuroimaging, Institute of Neurology, United Kingdom
We compared optical and electrophysiological measures for estimating eye-position and saccade-direction and -extent from simultaneous measurement of magnetoencephalography (MEG), bipolar electrooculogram (EOG) and optical (infrared) eye-tracking. A standard saccade-/gaze-calibration task was used to evaluate the absolute and comparative precision of each measure. In the constrained MEG environment, EOG and especially MEG itself were usually superior for estimating horizontal saccade-extent compared to the optical eyetracker. For vertical saccades EOG was worst while MEG often performed comparably to the optical eyetracker. For static gaze position (rather than deviations from this), the optical eyetracker proved essential due to drift in all other signals. In conclusion, saccade-direction and saccade-extent can reliably be measured from MEG and/or EOG datasets without an optical eyetracker, provided a standard gaze-calibration procedure is implemented.
Conference:
Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010.
Presentation Type:
Poster Presentation
Topic:
Instrumentation and Multi-modal Integrations: MEG, Low-field MRI,EEG, fMRI,TMS,NIRS
Citation:
Bauer
M,
Barnes
G,
Kluge
C and
Driver
J
(2010). Eye-tracking with MEG.
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00438
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Received:
12 Apr 2010;
Published Online:
12 Apr 2010.
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Correspondence:
Markus Bauer, University College London, London, United Kingdom, markus.bauer@gmail.com