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Profiling spontaneous speech decline in Alzheimer's disease: a longitudinal study

Published online by Cambridge University Press:  23 May 2013

Katrina Forbes-McKay ,
Michael F Shanks  and
Annalena Venneri
Katrina Forbes-McKay*
Affiliation:
School of Applied Social Studies, The Robert Gordon University, Aberdeen, UK
Michael F Shanks
Affiliation:
Department of Neuroscience, University of Sheffield, Sheffield, UK
Annalena Venneri
Affiliation:
Department of Neuroscience, University of Sheffield and Sheffield Teaching Hospital NHS Foundation Trust, Sheffield, UK and IRCCS, Fondazione Ospedale S. Camillo, Venice, Italy
*
Dr. Katrina Forbes-McKay, School of Applied Social Studies, Faculty of Health and Social Care, Robert Gordon University, Garthdee Road, Aberdeen, AB10 7GQ, UK. Tel: +44 1224 263211; Fax: +44 1224 263222 E-mail: k.e.forbes-mckay@rgu.ac.uk
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Abstract

Objective

This study aims to document the nature and progression of spontaneous speech impairment suffered by patients with Alzheimer's disease (AD) over a 12-month period, using both cross-sectional and prospective longitudinal design.

Methods

Thirty one mild–moderate AD patients and 30 controls matched for age and socio-cultural background completed a simple and complex oral description task at baseline. The AD patients then underwent follow-up assessments at 6 and 12 months.

Results

Cross-sectional comparisons indicated that mild–moderate AD patients produced more word-finding delays (WFDs) and empty and indefinite phrases, while producing fewer pictorial themes, repairing fewer errors, responding to fewer WFDs, produce shorter and less complex phrases and produce speech with less intonational contour than controls. However, the two groups could not be distinguished on the basis of phonological paraphasias. Longitudinal follow-up, however, suggested that phonological processing deteriorates over time, where the prevalence of phonological errors increased over 12 months.

Discussion

Consistent with findings from neuropsychological, neuropathological and neuroimaging studies, the language deterioration shown by the AD patients shows a pattern of impairment dominated by semantic errors, which is later joined by a disruption in the phonological aspects of speech.

Keywords

Alzheimer's diseasedementiadisease progressionlongitudinalsemanticspeech
Type
Original Articles
Information
Acta Neuropsychiatrica , Volume 25 , Issue 6 , December 2013 , pp. 320 - 327
Copyright
Copyright © Scandinavian College of Neuropsychopharmacology 2013 

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