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Behavioral/Systems/Cognitive Foveal Visual Strategy during Self-Motion Is Independent of
 

Summary: Behavioral/Systems/Cognitive
Foveal Visual Strategy during Self-Motion Is Independent of
Spatial Attention
Min Wei and Dora E. Angelaki
Department of Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
Translational self-motion disturbs the stability of retinal images by inducing a pattern of retinal optic flow that cannot be compensated
globally by a single eye movement. The eyes must rotate by different amounts, depending on which spatial location needs to be stabilized
on the retina. However, compensatory eye movements during steady fixation are always such as to maintain visual acuity on the fovea at
the expense of significant image slip on the peripheral retina. We investigated whether such a foveal visual strategy during translation is
hard-wired or whether it embeds enough flexibility to also allow for behaviorally relevant objects outside the foveae to be stabilized
preferentially on the retinas. Monkeys were moved forward or backward and leftward or rightward passively in darkness while planning
a saccade or bar release to peripheral dimmed targets. By comparing the eye movements made during these tasks with those under
conditions of steady fixation, we found that the motion-induced eye movements depended only on current fixation. This was true even
during the last milliseconds just before a saccade to the peripheral target. We conclude that the foveal stabilization strategy is invariant
and solely dependent on current eye position, a strategy that is optimal for both processing speed and efficiency in the extraction of
heading information from retinal flow during self-motion.
Key words: eye movement; vestibulo-ocular reflex; spatial attention; self-motion; vergence angle; Foveal strategy
Introduction
When a moving subject experiences lateral motion, as when we
look through the window of a moving car, the speed of the retinal

  

Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis

 

Collections: Biology and Medicine