Knowledge of Living and Nonliving Things in Dementia of the Alzheimer’s Type
Journal Title: Journal of the Indian Academy of Geriatrics - Year 2017, Vol 13, Issue 2
Abstract
This paper examines methodological issues concerning the measurement of semantic memory impairment in dementia of the Alzheimer’s type. Fifteen mildly demented (aged 62-72 yrs, mean=68.40 yrs, SD=3.68 yrs.) and ten moderately demented patients(aged 6580 yrs, mean=69.50 yrs, SD=4.28 yrs) screened on the basis of Hindi version of Mini-Mental status examination, Hindi version of Wechsler memory scale, Mattis Dementia scale and NINCDS-ADRDA criteria and fifteen matched control subjects (aged 60-72 yrs, mean=64.00 yrs, SD= 3.11 yrs) performed a picture naming task which was classified into living and manmade categories. Results reveal that mildly and moderately demented patients show a differential pattern of impairment of specific categories of semantic knowledge. Pictorial stimuli about eight categories, four of which belonging to living and remaining four belonging to the manmade group were random presented one by one and subject were required to name them. Results indicate that picture naming for manmade objects are higher than that of living objects for both mildly and moderately demented patients. These results support the category and modality specific model of Warrington and the hybrid model of Chartkow and Bub which indicate that encoding functional attribute always effects the man made category which is less impaired. It also indicates that there is a "category effect", meaning that Alzheimer Dementia preferentially affects concepts dealing with living things and abstract concepts compared to non living objects.
Authors and Affiliations
S Gopaljee
Keywords
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Knowledge of Living and Nonliving Things in Dementia of the Alzheimer’s Type
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