| 131. |
- Östberg, Per, et al.
(author)
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A temporal lobe factor in verb fluency
- 2007
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In: Cortex. - 0010-9452 .- 1973-8102. ; 43:5, s. 607-615
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Journal article (peer-reviewed)abstract
- Verb fluency requires self-sustained verb retrieval. The brain correlates of this task are virtually unknown. We investigated the relations between verb and noun (semantic) fluency and regional brain perfusion in subjects with varying degrees of cognitive decline, ranging from very mild subjective impairment to Alzheimer's disease (AD). Data consisted of single-photon emission computed tomography (SPECT) data and temporally resolved verb and noun fluency scores from 93 participants. Impaired verb fluency was predicted by a temporal lobe hypoperfusion factor and low education, whereas high age and low perfusion in the parietotemporal-occipital region predicted impaired noun fluency. Analysis of perfusion within the temporal region indicated primary involvement of the temporal pole and medial temporal lobe in AD. This might reflect pathology of the anterior parahippocampal region, which appears early in neurodegenerative disease. Although temporal lobe structures have not usually been implicated in verb processing, early temporal pathology thus appears to contribute to impaired verb fluency in cognitive decline.
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| 132. |
- Östberg, Per, et al.
(author)
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Articulatory agility in cognitive decline
- 2009
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In: Folia Phoniatrica et Logopaedica. - : S. Karger AG. - 1021-7762 .- 1421-9972. ; 61:5, s. 269-274
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Journal article (peer-reviewed)abstract
- OBJECTIVE: Motor speech disorders are believed to be uncommon in early Alzheimer's disease (AD). However, data from maximum performance tests of motor speech function in AD and related disorders are virtually nonexistent. The aim of this study was to make such data available. MATERIALS AND METHODS: Sequential speech motion rate was analyzed in 236 memory clinic patients with different levels of cognitive functioning. RESULTS: Sequential speech motion rate was moderately but significantly decreased in mild dementia in AD. About 10% of AD and mild cognitive impairment cases had markedly decreased rates. Rates were strongly reduced in progressive nonfluent aphasia, whereas semantic dementia did not differ from subjective cognitive impairment. Frontotemporal dementia had lower rates than AD. CONCLUSIONS: A proportion of patients with cognitive decline has markedly reduced articulatory agility. The cause of this reduction in some patients with mild cognitive impairment and mild AD is unknown. Semantic dementia is not associated with impaired articulatory agility.
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| 133. |
- Östberg, Per, et al.
(author)
-
Impaired verb fluency : a sign of mild cognitive impairment
- 2005
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In: Brain and Language. - : Elsevier BV. - 0093-934X .- 1090-2155. ; 95:2, s. 273-279
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Journal article (peer-reviewed)abstract
- We assessed verb fluency vs. noun and letter-based fluency in 199 subjects referred for cognitive complaints including Subjective Cognitive Impairment, Mild Cognitive Impairment, and Alzheimer's disease. ANCOVAs and factor analyses identified verb, noun, and letter-based fluency as distinct tasks. Verb fluency performance in Mild Cognitive Impairment differed significantly from Subjective Cognitive Impairment and Alzheimer's disease. Reduced verb fluency thus appears to be a linguistic marker for incipient dementia. One possibility is that the verb fluency deficit in Mild Cognitive Impairment results from degenerative processes known to occur in the parahippocampal region.
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| 134. |
- Östberg, Per, et al.
(author)
-
Word sequence production in cognitive decline : forward ever, backward never
- 2008
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In: Logopedics, Phoniatrics, Vocology. - : Informa UK Limited. - 1401-5439 .- 1651-2022. ; 33:3, s. 126-135
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Journal article (peer-reviewed)abstract
- Backward recall of automatic word sequences involves declarative and working memory abilities known to be impaired in the early stages of cognitive decline. Yet its utility in the diagnosis of mild cognitive impairment and mild dementia has not been studied in detail. We analysed word sequence production in 234 participants drawn from three categories: subjective cognitive impairment, mild cognitive impairment, and mild dementia in Alzheimer's disease. The names of the months were used as a diagnostic target for investigating forward versus backward sequence production. Forward production remained normal across categories. In contrast, backward speed was significantly decreased in mild cognitive impairment. In dementia both speed and accuracy were impaired. Backward production had significant diagnostic classificatory power. We conclude that word sequence production yields data relevant to the diagnosis of dementia with a minimum of time and expense.
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