December 2011
Volume 11, Issue 15
OSA Fall Vision Meeting Abstract  |   December 2011
An Eye-Movement-Defined Hierarchy of Visual Stimuli
Author Affiliations
  • Jeffrey Mulligan
    NASA Ames Research Center
  • Scott Stevenson
    University of Houston, Optometry
Journal of Vision December 2011, Vol.11, 52. doi:
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      Jeffrey Mulligan, Scott Stevenson; An Eye-Movement-Defined Hierarchy of Visual Stimuli. Journal of Vision 2011;11(15):52.

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      © ARVO (1962-2015); The Authors (2016-present)

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Reverse correlation of stimulus velocity with eye velocity can be used to infer pursuit latency in a task in which a subject attempts to follow a target undergoing random motion. Using a binocular dual Purkinje image eye tracker equipped with stimulus deflectors, we measured tracking responses to four-dimensional motion, produced by delivering an independent random walk to each eye, analyzing the results in terms of horizontal and vertical vergence and version. High-contrast luminance-defined stimuli produce the shortest latencies (around 100 msec); varying texture contrast increases the delay by approximately 50 msec/log unit. Nulling the first-order luminance contrast in a second-order constrast-modulated target produces a dramatic increase in latency (over 100 msec additional delay), and abolishes the vertical vergence response - the only one of the four types of movement that cannot be executed voluntarily. We propose a model of the system in which a fast reflexive system responds to a limited class of stimuli, while a slower voluntary system is capable of tracking anything that can be seen.


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