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

Abstract

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.

Quantitative Electroencephalography and Behavioural Correlates of Daytime Sleepiness in Chronic Stroke

“…These findings are in line with reports of increased global delta and theta during the acute phase of stroke [36, 38, 39]. The only study which examined qEEG in chronic stroke patients beyond one year used a single electrode in the frontal area and showed significantly more delta in patients [50]. The present findings therefore expand existing knowledge on the characteristics of the wake EEG in the chronic state.…”

Mental tasks discrimination by neural networks with wavelet transform

“…Now we believe it is possible to build an EEG-based communication device with several mental tasks, and we hope to build a prototype systems that can be used for people with severe physical disabilities (Yuasa et al 2001). The results indicate that the EEG discrimination also can be used to train a subject to control desired EEG (Wolpaw et al 2000).…”

Poststroke QEEG informs early prognostication of cognitive impairment

“…Alpha slowing was originally observed via routine clinical EEG assessments involving visual inspection by a neurologist or neurophysiologist (e.g., Niedermeyer & Da Silva, ) and has more recently been reported from QEEG studies that compute peak alpha frequency (PAF; the frequency value at which alpha activity is of maximal power). For example, Yuasa et al () reported significantly lower PAF in stroke patients than controls, indicating alpha slowing, observing that PAF as low as 6 Hz was just one standard deviation below the stroke sample's PAF mean (of 7.95 Hz). Our methods were informed by the results of that and other studies (e.g., Moretti et al, ); we analyzed PAF using the 5.5–12.5 Hz range (encompassing the classical alpha and upper theta ranges) in order to be sensitive to alpha slowing and the associated, poststroke decrease in PAF.…”