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Researchers have long sought to understand what the brain does when we
see an object, what two people have in common when they see the same
object, and what a "seeing" machine would need to have in common with
a human visual system. Recent neurobiological and computational
advances in the study of vision have now brought us close to answering
these and other questions about representation.
In Representation and Recognition in Vision, Shimon
Edelman bases a comprehensive approach to visual representation on the
notion of correspondence between proximal (internal) and distal
similarities in objects. This leads to a computationally feasible and
formally veridical representation of distal objects that addresses the
needs of shape categorization and can be used to derive models of
perceived similarity.
Edelman first discusses the representational needs of various visual
recognition tasks, and surveys current theories of representation in
this context. He then develops a theory of representation that is
related to Shepard's notion of second-order isomorphism between
representations and their targets. Edelman goes beyond Shepard by
specifying the conditions under which the representations can be made
formally veridical. Edelman assesses his theory's performance in
identification and categorization of 3D shapes and examines it in
light of psychological and neurobiological data concerning the
object-processing stream in primate vision. He also discusses the
connections between his theory and other efforts to understand
representation in the brain.
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