Quantitative Electroencephalographic Correlates of Cognitive Decline in Normal Elderly Subjects

Williamson, Peter C.; Merskey, Harold; Morrison, Sandra; Rabheru, Kiran; Fox, Hannah; Wands, Kim; Wong, Cindy J.; Hachinski, Vladimir

doi:10.1001/archneur.1990.00530110039014

Cited by 61 publications

(27 citation statements)

References 18 publications

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“…Williamson et al [17] found a positive correlation between absolute beta power and cognitive performance in normal elderly subjects. Beta power was markedly reduced in some subjects with early signs of cognitive decline.…”

Section: Discussionmentioning

confidence: 98%

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Mild Cognitive Impairment in Old-Age Depression Is Associated with Increased EEG Slow-Wave Power

Adler¹,

Bramesfeld²,

Jajcevic³

1999

Neuropsychobiology

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Reversible dementia in geriatric depression is known to be a risk factor for irreversible dementia. Whether just mild cognitive deficits in elderly depressed patients hold a similar risk is not known yet. It may be suggested that elderly depressed patients with mild cognitive deficits, who are prone to develop dementia, show EEG alterations similar to those observed in demented patients. We studied the relationships between cognitive performance, severity of depressive symptoms and quantitative EEG parameters in 31 unmedicated, nondemented, depressed patients aged 60 years or more. Twenty-one of the patients showed a cognitive performance characteristic of mild cognitive impairment. In these patients, the mean delta and theta power was significantly higher than in the patients without cognitive impairment. Total delta power was negatively correlated with cognitive performance. There was no relationship between cognitive performance or EEG parameters and the severity of depression.

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Section: Discussionmentioning

confidence: 98%

“…Absolute delta and theta power in patients suffering from Alzheimer's disease is negatively correlated with cognitive function [14,15]. Furthermore, a positive correlation between cognitive performance and beta activity has been shown in patients suffering from Alzheimer's disease [16] as well as in nondemented elderly subjects [17].…”

Section: Introductionmentioning

confidence: 99%

Mild Cognitive Impairment in Old-Age Depression Is Associated with Increased EEG Slow-Wave Power

Adler¹,

Bramesfeld²,

Jajcevic³

1999

Neuropsychobiology

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“…Williamson et al (1990) reported that cognitive performance correlated positively with fast (beta) activity particularly in frontal leads, and that reduced beta activity might be an early indication of intellectual loss. Decreased alpha activity was also seen in their patients.…”

Section: Discussionmentioning

confidence: 99%

Quantitative EEG Data and Comprehensive ADL (Activities of Daily Living) Evaluation of Stroke Survivors Residing in the Community.

Yuasa

Maeda

Higuchi

et al. 2001

J. Physiol. Anthropol.

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The purpose of this study was to investigate the hypothesis that EEG values match other comprehensive activities of daily living (ADL) evaluations between stroke survivors and normal controls. Various functions related to ADL were examined by means of ADL assessments (Measurement of Competence in the Elderly Living at Home, Barthel Index, Stroke Impairment Assessment Set, t i me n e e d e d to w a l k 10 me tr e s ) a n d bi o s o ci a l synchronization (the questionnaire on biosocial rhythms of daily living). EEG was undertaken using a computerassisted portable EEG recorder. The power spectra were computed using a fast Fourier transformation analysis (FFT). The absolute and relative powers (percent of the total EEG power) of 5 frequency bands (delta, theta, alpha 1, alpha 2 and beta) and the peak frequency were analyzed. In comparing stroke survivors and the independent elderly, the latter had higher scores than the former in assessments of various functions related to ADL. The absolute and relative power of the delta band were lower in normal controls, and the relative power of the alpha (2) band and the peak frequency were higher than those of stroke survivors. Among the correlations between EEG and ADL assessments, the absolute and r elati ve p ower of the alpha (2) band cor related significantly with ADL assessments of stroke survivors with right hemiplegia. The peak frequency was significantly increased in cases with high ADL scores. In conclusion, significant correlations were identified between the quantitative EEG data of stroke survivors in the chronic stage, living in the community, and ADLrelated functions. Computer-assisted portable EEG recording is a potentially useful screening tool for objectively evaluating the functional levels of stroke survivors in field work.

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“…These factors related to spending time on death row may impact the EEG. For example, cognitive decline may impact broad band beta, as a decrease in broad band beta power has been reported in normal aging subjects experiencing cognitive decline (Williamson et al, 1990). A similar trend has been observed in broad band alpha (Soininen et al, 1991).…”

Section: Introductionmentioning

confidence: 58%

Quantitative EEG Findings in Convicted Murderers

Vendemia

Caine

Evans

2006

Journal of Neurotherapy

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Quantitative Electroencephalographic Correlates of Cognitive Decline in Normal Elderly Subjects

Cited by 61 publications

References 18 publications

Mild Cognitive Impairment in Old-Age Depression Is Associated with Increased EEG Slow-Wave Power

Mild Cognitive Impairment in Old-Age Depression Is Associated with Increased EEG Slow-Wave Power

Quantitative EEG Data and Comprehensive ADL (Activities of Daily Living) Evaluation of Stroke Survivors Residing in the Community.

Quantitative EEG Findings in Convicted Murderers

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