Impaired access to semantic memory for the cognition of geographic space in Alzheimer's disease

Debora Mazzei, Andrea Brugnolo, Barbara Dessi, Nicola Girtler, Francesco Famà, Elisa Rizza, Flavio Nobili, Guido Rodriguez

Research output: Contribution to journalArticlepeer-review

Abstract

This study explores the possibility to capitalize from a widely used semantic fluency test, in order to investigate aspects of topographical space representation, still poorly studied in neurodegenerative diseases. Twenty-six patients with mild Alzheimer's disease (AD) and 13 healthy control (CTR) subjects underwent neuropsychological assessment at baseline (T0) and about 2 years later (T1). The cities named during category verbal fluency test ("names of cities") were marked on a map, and the polygon perimeter obtained by joining the external points was computed. Mini-mental state examination (MMSE) score, number of cities named and perimeter length were compared between T0 and T1, both within-group and between groups. MMSE score and number of cities significantly differed between AD and CTR both at T0 and at T1; perimeter length differed significantly only at T1. Between T0 and T1, all the three parameters significantly decreased in AD, while they were substantially unchanged in CTR. Besides a reduction of semantic verbal fluency, there seems to be a 'restriction' of mental geographic space representation already in mild AD. These findings should be confirmed and exploited by further ad hoc investigations.

Original languageEnglish
Pages (from-to)198-201
Number of pages4
JournalArchives of Gerontology and Geriatrics
Volume50
Issue number2
DOIs
Publication statusPublished - Mar 1 2010

Keywords

  • Alzheimer's disease
  • Neurodegenerative diseases
  • Semantic fluency test
  • Semantic memory
  • Topographical space representation
  • Verbal fluency

ASJC Scopus subject areas

  • Health(social science)
  • Ageing
  • Gerontology
  • Geriatrics and Gerontology

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