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Journal of Neuroscience, Vol 7, 943-958, Copyright © 1987 by Society for Neuroscience
Centrifugal organization of direction preferences in the cat's lateral suprasylvian visual cortex and its relation to flow field processing
JP Rauschecker, MW von Grunau and C Poulin
The cerebral cortex of the cat contains between 1 and 2 dozen
representations of the visual field with different functional
specializations. Six visual field maps lie along both banks of the
suprasylvian sulcus, lateral and anterior to the visual areas in the
occipital cortex. We have studied single-unit receptive field properties
and their global organization across the visual field in 2 of these lateral
suprasylvian areas, PMLS (essentially the Clare-Bishop area) and PLLS. Most
neurons in PMLS and PLLS display selectivity for the direction of a light
stimulus moving across their receptive fields with various degrees of
directional tuning. We have used light spots of different size and velocity
projected on a tangent screen in order to determine the direction
preference of cells in these 2 areas. A strong tendency was found for
neurons to respond best to centrifugal directions, i.e., to movement away
from the area centralis. Thus, for these cells direction preference depends
on the location of their receptive fields within the visual field. Velocity
preference and binocular interaction in these neurons is also globally
organized: Velocity preference increases with eccentricity, binocular
synergism is strongest in the center of the visual field. Cluster analysis
of recording tracks with respect to "radial" and "circular" cell categories
reveals a grouping of cells with like properties in the lateral
suprasylvian cortex. These new categories are formed by combining
"centrifugal" and "centripetal" cells on the one hand and cells with
direction preferences orthogonal to these on the other. The radial or
centrifugal organization of direction preferences in conjunction with the
global arrangement of velocity preference and binocular interaction
suggests that PMLS and PLLS are involved in the processing of expanding
visual flow fields of motion. Such flow fields are commonly encountered
when a visual object moves towards an observer or during forward
locomotion.
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