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The Journal of Neurophysiology Vol. 83 No. 4 April 2000, pp. 2453-2457
Copyright ©2000 by the American Physiological Society
RAPID COMMUNICATION
1Laboratory of Brain and Cognition, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892; and 2Department of Psychology, College of Social and Behavioral Sciences, University of Arizona, Tucson, Arizona 85721
Kastner, Sabine,
Peter De
Weerd, and
Leslie G. Ungerleider.
Texture Segregation in the Human Visual Cortex: A Functional
MRI Study. J. Neurophysiol. 83: 2453-2457, 2000. The segregation of visual scenes based on contour
information is a fundamental process of early vision. Contours can be
defined by simple cues, such as luminance, as well as by more complex cues, such as texture. Single-cell recording studies in monkeys suggest
that the neural processing of complex contours starts as early as
primary visual cortex. Additionally, lesion studies in monkeys indicate
an important contribution of higher order areas to these processes.
Using functional MRI, we have investigated the level at which neural
correlates of texture segregation can be found in the human visual
cortex. Activity evoked by line textures, with and without
texture-defined boundaries, was compared in five healthy subjects.
Areas V1, V2/VP, V4, TEO, and V3A were activated by both kinds of line
textures as compared with blank presentations. Textures with boundaries
forming a checkerboard pattern, relative to uniform textures, evoked
significantly more activity in areas V4, TEO, less reliably in V3A, but
not in V1 or V2/VP. These results provide evidence that higher order
areas with large receptive fields play an important role in the
segregation of visual scenes based on texture-defined boundaries.
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