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Proceedings Paper

Effects of stimulus size and velocity on steady-state smooth pursuit induced by realistic images
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Paper Abstract

Smooth pursuit eye movements align the retina with moving targets, ideally stabilizing the retinal image. At a steadystate, eye movements typically reach an approximately constant velocity which depends on, and is usually lower than the target velocity. Experiment 1 investigated the effect of target size and velocity on smooth pursuit induced by realistic images (color photographs of an apple and flower subtending 2° and 17°, respectively), in comparison with a small dot subtending a fraction of a degree. The extended stimuli were found to enhance smooth pursuit gain. Experiment 2 examined the absolute velocity limit of smooth pursuit elicited by the small dot and the effect of the extended targets on the velocity limit. The eye velocity for tracking the dot was found to be saturated at about 63 deg/sec while the saturation velocity occurred at higher velocities for the extended images. The difference in gain due to target size was significant between dot and the two extended stimuli, while no statistical difference exists between an apple and flower stimuli of wider angular extent. Detailed knowledge of the smooth pursuit eye movements is important for several areas of electronic imaging, in particular, assessing perceived motion blur of displayed objects.

Paper Details

Date Published: 17 February 2010
PDF: 10 pages
Proc. SPIE 7527, Human Vision and Electronic Imaging XV, 752717 (17 February 2010); doi: 10.1117/12.840146
Show Author Affiliations
Feng Li, Aptina Imaging Corp. (United States)
Jeff B. Pelz, Rochester Institute of Technology (United States)
Scott J. Daly, Sharp Labs. of America, Inc. (United States)

Published in SPIE Proceedings Vol. 7527:
Human Vision and Electronic Imaging XV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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