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Radial optic flow induces vergence eye movements with ultra-short latencies

Nature volume 390, pages 512–515 (1997)Cite this article

Abstract

An observer moving forwards through the environment experiences a radial pattern of image motion on each retina. Such patterns of optic flow are a potential source of information about the observer's rate of progress1, direction of heading2 and time to reach objects that lie ahead3. As the viewing distance changes there must be changes in the vergence angle between the two eyes so that both foveas remain aligned on the object of interest in the scene ahead. Here we show that radial optic flow can elicit appropriately directed (horizontal) vergence eye movements with ultra-short latencies (roughly 80 ms) in human subjects. Centrifugal flow, signalling forwards motion, increases the vergence angle, whereas centripetal flow decreases the vergence angle. These vergence eye movements are still evident when the observer's view of the flow pattern is restricted to the temporal hemifield of one eye, indicating that these responses do not result from anisotropies in motion processing but from a mechanism that senses the radial pattern of flow. We hypothesize that flow-induced vergence is but one of a family of rapid ocular reflexes, mediated by the medial superior temporal cortex, compensating for translational disturbance of the observer.

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Figure 1: Initial vergence responses to looming steps (radial optic flow plus size change).
Figure 2: The adequate stimulus for the short-latency vergence associated with looming steps is radial flow and the size changes are irrelevant.
Figure 3: Effect of masking off various parts of the binocular visual fields on initial ocular responses of subject FAM to centrifugal optic flow.

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Acknowledgements

G.S.M. was supported by La Fondation pour la Recherche Medicale (France).

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Author notes

  1. C. Busettini

    Present address: Department of Physiological Optics, University of Alabama, Birmingham, Alabama, 35205, USA

  2. G. S. Masson

    Present address: Centre de Recherche en Neurosciences Cognitives, Centre National de la Recherche Scientifique, 13402, Marseille, France

Authors and Affiliations

  1. Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, 20892, Maryland, USA

    F. A. Miles

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  1. C. Busettini
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  2. G. S. Masson
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  3. F. A. Miles
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Corresponding author

Correspondence to F. A. Miles.

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Busettini, C., Masson, G. & Miles, F. Radial optic flow induces vergence eye movements with ultra-short latencies. Nature 390, 512–515 (1997). https://doi.org/10.1038/37359

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