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Jeff B. Pelz, Constantin A. Rothkopf, Steven R. Broskey; Version and vergence eye movements in mobile observers. Journal of Vision 2005;5(8):441. doi: 10.1167/5.8.441.
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© ARVO (1962-2015); The Authors (2016-present)
The bulk of published data on eye movements have been gathered in laboratory settings. One eye of a seated observer is often tracked while s/he views static objects or images constrained to a single depth plane. By contrast, eye movements in natural environments are often made while the observer and/or target are in motion, to objects that vary in both direction and depth. We monitored monocular and binocular eye movements of mobile observers as they performed a number of tasks, from scanning a 3D array of targets while seated in the laboratory, to navigating footpaths in natural, wooded environments. A custom-built wearable eyetracker was used to monitor version and vergence eye movements of observers performing the tasks under a range of conditions. Monocular and binocular eye movements were studied within a 3-dimensional array of calibration points surrounding observers indoors, free viewing outdoor scenes, a visual search task, and while walking indoors and out.
In the free-view task observers were instructed to simply familiarize themselves with a region defined as the hemisphere forward from their fixed viewpoint. In the visual search task, observers searched for a small target within a hemisphere. Free to move their heads and bodies, large gaze changes (> 30 deg) were common. Fixations durations in the search task ranged from 1000 msec fixations while inspecting high-density regions. While it is possible to extract individual version and vergence ‘components’ of gaze shifts between targets in 3D space, the right and left eye movements each exhibit main-sequence saccadic characteristics; the dynamics of each determined by the relative location of the two eyes and the sequence of targets.
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