Abstract
The clinical spectrum of visual agnosia includes a variety of cognitive deficits and the incidence and relationship of these remain problematic. The syndromes of apperceptive and associative visual agnosia overlap most often but the occasional well documented dissociation is of great interest. Experimental evidence concerning these entities is scant and at times controversial but suggests several levels of processing that may be impaired independently. In this article, I shall address myself to these syndromes and attempt to describe the cognitive stages in visual recognition with respect to their intact and defective state, so as to provide an explanation of how the visual system functions cognitively.
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