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Neuronal responses in extrastriate cortex to objects in optic flow fields

Published online by Cambridge University Press:  02 June 2009

Helen Sherk ,
Kathleen Mulligan  and
Jong-Nam Kim
Helen Sherk
Affiliation:
Department of Biological Structure, University of Washington, Seattle
Kathleen Mulligan
Affiliation:
Department of Biological Structure, University of Washington, Seattle
Jong-Nam Kim
Affiliation:
Department of Biological Structure, University of Washington, Seattle
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Abstract

During locomotion, observers respond to objects in the environment that may represent obstacles to avoid or landmarks for navigation. Although much is known about how visual cortical neurons respond to stimulus objects moving against a blank background, nothing is known about their responses when objects are embedded in optic flow fields (the patterns of motion seen during locomotion). We recorded from cells in the lateral suprasylvian visual area (LS) of the cat, an area probably analogous to area MT. In our first experiments, optic flow simulations mimicked the view of a cat trotting across a plain covered with small balls; a black bar lying on the balls served as a target object. In subsequent experiments, optic flow simulations were composed of natural elements, with target objects representing bushes, rocks, and variants of these. Cells did not respond to the target bar in the presence of optic flow backgrounds, although they did respond to it in the absence of a background. However, 273/423 cells responded to at least one of the taller, naturalistic objects embedded in optic flow simulations. These responses might represent a form of image segmentation, in that cells detected objects against a complex background. Surprisingly, the responsiveness of cells to objects in optic flow fields was not correlated with preferred direction as measured with a moving bar or whole-field texture. Because the direction of object motion was determined solely by receptive-field location, it often differed considerably from a cell's preferred direction. About a quarter of the cells responded well to objects in optic flow movies but more weakly or not at all to bars moving in the same direction as the object, suggesting that the optic flow background modified or suppressed direction selectivity.

Keywords

Lateral suprasylvian cortexOptic flowImage segmentationExtrastriate cortex
Type
Research Articles
Information
Visual Neuroscience , Volume 14 , Issue 5 , September 1997 , pp. 879 - 895
Copyright
Copyright © Cambridge University Press 1997

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