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> Much of our behavior depends upon accurate perception of the
3-dimensional spatial layout of the environment. Multiple
sources of visual information are available to specify this
layout, including stereopsis, motion parallax, shading and
perspective. This raises the question of how the visual system
combines these sources of information, which is also referred to
as the problem of sensory fusion. I and Dr. Barbara Gillam (U.
of New South Wales in Australia) are exploring the role of
perceptual surfaces in mediating the integration of two kinds of
information for space perception: stereopsis and perspective. By
integrating the local stereoscopic information relating an
object to a surface with the stereoscopic and perspective
information operating across the entire extent of the surface,
the visual system can potentially greatly enhance the accuracy
and precision with which the obj