A series of neuropsychological tests covering four broad areas-orientation, memory, linguistic functions and visuospatial functions-was administered to 93 patients with aphasia, and the results were compared with data obtained from 91 patients with mild to moderate dementia (Sasanuma et al., 1987) . The latter were further divided into two diagnostic groups-52 patients with dementia of the Alzheimer's type (DAT) and 39 patients with vascular dementia (VaD) -in order to explore differences in performance among the three diagnostic groups. Major findings included the following:
(1) Performance profiles of the two dementia groups were similar except for a higher Story Recall (Delayed) score for the VaD group.
(2) The aphasic patients as a group exhibited poor performance on tests of linguistic functions but well-preserved performance on tests of visuospatial functions. The dementia groups exhibited the reversed pattern.
(3) The three groups performed differently on tests of orientation and memory. The performance of the DAT group was significantly poorer than that of the aphasia group on the Orientation test, but differences in performance between the aphasia group and the VaD group did not reach a level of significance. The percentage of information remembered in the Story Retelling (Delayed) test revealed that the aphasia group was on a par with normal controls while the two dementia groups showed marked decreases over time, particularly the DAT group.
(4) Implications for clinical application of the results to differential diagnosis between major subtypes of aphasia and dementia, particularly the VaD group, were discussed.
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