Abstract
In order to understand the clinical pictures of visual agnosia, a good cognitive model of visual perception is needed. The Lissauer's classification of visual agnosia into two distinct types, apperceptive agnosia and associative agnosia, has now to be criticized from the current theory of visual perception. Since neurophysiological studies on animals and neuropsychological studies in men, both suggest the modular organization of visual information processing in brain, clinical examination of visual agnosia should be based upon a new cognitive model corresponding to the parallel information processing of visual perception.
