Abstract
Language impairments have long been recognized as occurring in dementia of the Alzheimer type but have only recently attracted more detailed attention. Some have regarded these impairments as being a form of aphasia, as encountered in subjects with focal brain lesions. This could be misleading since there are differences between the language impairment in dementia and aphasia. With regard to specific aspects of linguistic performance, the semantic and lexical aspects appear to be rather more vulnerable to deterioration than the phonological and syntactic. In addition, the analysis of language in dementia is complicated by the fact that tests of language can also be affected by disturbances in other psychologial functions, such as memory and perception, similarly prone to disruption in dementia.
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