Abstract
The author tried to evaluate the significance of cognitive psychology form clinical neuropsychological point of view, examining “Visual Agnosia” (1990) written by Farah. Two major problems were revealed as follows : 1) Farah insisted that in a PDP (parallel distributed processing) system the perceptual and memory representation cannot be dissociated, that means fundamental difficulty of distingushing apperceptive and associative agnosia. However there exist a few case reports of “symbolic form” of visual agnosia whose capacity of copying or matching figures were almost preserved. 2) Concerning Farah's trying to distinguish dorsal and ventral simultanagnosia, she contributed to indicate the heterogeneity of simultanagnosia but regrettably neglected the proper type of simultanagnosia described by Wolpert (1924) that is so to speak impaired comprehention of “epistemological simultaneity” rather than spacio-temporal one. It is important for cognitive psychology and clinical neuropsychology to have the true common understanding for the clinical facts and to discuss it incessantly.
