Abstract
Eye-position recordings have been used to produce detailed information about sampling and search behavior. The melding of magnetic head-tracking technology with eye-tracking systems has allowed for freer head movement, but not without problems. Although the requisite calibrations made before and after a reading might indicate good eye-tracking accuracy, point-of-gaze errors can occur if the reader leans toward a display, such as a film alternator. The error results from the characteristic that large metal masses can distort magnetic fields, leading to false magnetic sensor data. Corrections for this type of error have involved mapping the exact location and orientation of the magnetic sensor in the magnetic field by using a precision positioning device. We have devised a much cheaper method that relies on a fixture that holds the magnetic sensor in identical positions, with and without the distorting effect.
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This work was supported by U.S. Public Health Service Grant RO1 CA 42453 from the National Cancer Institute, Bethesda, MD. Applied Science Laboratories retains a proprietary interest in the correction routine software that was added to the proprietary calibration routines, which precludes our sharing the source code of the routines.
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Caldwell, R.T., Berbaum, K.S. & Borah, J. Correcting errors in eye-position data arising from the distortion of magnetic fields by display devices. Behavior Research Methods, Instruments, & Computers 32, 572–578 (2000). https://doi.org/10.3758/BF03200830
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DOI: https://doi.org/10.3758/BF03200830