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Eye-tracking

NT Nouk Tanke
AB Annemiek D. Barsingerhorn
FB F. Nienke Boonstra
JG Jeroen Goossens
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Horizontal and vertical eye movements were measured with a remote stereoscopic eye tracking system23 consisting of two USB 3.0 cameras and two infrared light sources. The tracking software (http://github.com/Donders-Institute/Stereo-gaze-tracking) captured the pupil and corneal reflections (glints) of both eyes. The one-point calibration that is required for this method was part of another task50. The offline gaze reconstruction combined the asynchronous data from the two cameras into gaze position signals with an average refresh-rate of ~ 500 Hz. Since the system did not only record the point of gaze (POG) on the screen, but also the three-dimensional location of the eyes, we could accurately account for head translations. The spatial accuracy of the resulting eye movement measurements was ~ 0.7°. The spatial resolution was better than 0.2° and the sample-to-sample noise was less than 0.05°.

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