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

Feng Li; Jeff B. Pelz; Scott J. Daly

doi:10.1117/12.840146

17 February 2010 Effects of stimulus size and velocity on steady-state smooth pursuit induced by realistic images

Feng Li, Jeff B. Pelz, Scott J. Daly

Proceedings Volume 7527, Human Vision and Electronic Imaging XV; 752717 (2010) https://doi.org/10.1117/12.840146
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

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.

Citation Download Citation

Feng Li, Jeff B. Pelz, and Scott J. Daly "Effects of stimulus size and velocity on steady-state smooth pursuit induced by realistic images", Proc. SPIE 7527, Human Vision and Electronic Imaging XV, 752717 (17 February 2010); https://doi.org/10.1117/12.840146

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