Delusional misidentification: A neuropsychological case study in dementia associated with parkinson's disease

Abstract

A patient (Case 1) with an unusual delusional misidentification syndrome (DMS), in the context of dementia and Parkinson's disease, is reported. Neuropsychological assessment revealed wide-ranging abnormalities in visual and facial processing. Semantic function, however, retained greater preservation. These findings support neuroanatomical evidence of increased right hemisphere pathology in DMS. Finally, classification of Case 1's DMS variant is discussed, with particular reference to a new categorizing system.