The cognitive neuroscience of human vision draws on two kinds of
evidence: functional imaging of normal subjects and the study of
neurological patients with visual disorders. Martha Farah's
landmark 1990 book Visual Agnosia presented the first comprehensive
analysis of disorders of visual recognition within the framework of
cognitive neuroscience, and remains the authoritative work on the
subject. This long-awaited second edition provides a reorganized
and updated review of the visual agnosias, incorporating the latest
research on patients with insights from the functional neuroimaging
literature. Visual agnosia refers to a multitude of different
disorders and syndromes, fascinating in their own right and
valuable for what they can tell us about normal human vision. Some
patients cannot recognize faces but can still recognize other
objects, while others retain only face recognition. Some see only
one object at a time; others can see multiple objects but recognize
only one at a time. Some do not consciously perceive the
orientation of an object but nevertheless reach for it with
perfected oriented grasp; others do not consciously recognize a
face as familiar but nevertheless respond to it autonomically. Each
disorder is illustrated with a clinical vignette, followed by a
thorough review of the case report literature and a discussion of
the theoretical implications of the disorder for cognitive
neuroscience.The second edition extends the range of disorders
covered to include disorders of topographic recognition, and both
general and selective disorders of semantic memory, as well as
expanded coverage of face recognition impairments. Also included
are a discussion of the complementary roles of imaging and
patient-based research in cognitive neuroscience, and a final
integrative chapter presenting the "big picture" of object
recognition as illuminated by agnosia research.
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