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Comparative Neuropsychology$
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A. David Milner

Print publication date: 1998

Print ISBN-13: 9780198524113

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198524113.001.0001

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Sensory factors in human visual agnosia

Sensory factors in human visual agnosia

(p.15) 2 Sensory factors in human visual agnosia
Comparative Neuropsychology

Andrew W. Young

Oxford University Press

Modern studies indicate several different causes of visual object agnosia. Lissauer himself realized this at the end of the nineteenth century; he proposed that visual recognition can be separated into apperceptive and associative stages, and that each when impaired had its own characteristic agnosia. The apperceptive stage would correspond to the final stage of purely perceptual processing; it was considered to be intact if a brain-injured person could accurately copy items they could not recognize. The associative stage would give the percept meaning by linking it to previous experience; leading to the widely adopted description of associative agnosia as corresponding to a normal percept ‘stripped of its meaning’.

Keywords:   visual agnosia, visual recognition, apperceptive stage, associative agnosia, brain injury

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