An EEG Experiment Aimed Toward Identifying Dyslexic Children

Sklar, Bernard; Hanley, J. Richard; Simmons, W. W.

doi:10.1038/240414a0

Cited by 106 publications

(42 citation statements)

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“…EEG coherence can be defined as the normalized crosspower spectrum per frequency of two signals recorded simultaneously at different sites of the scalp. It is a measure of the synchronization between the two signals and may be interpreted as an expression of their functional interaction [10,11]. There is a general consensus among studies for a decreased coherence of the alpha and beta bands in various types of dementia [12].…”

Section: Introductionmentioning

confidence: 99%

Quantitative electroencephalogram analysis in dementia with Lewy bodies and Alzheimer's disease

Kai

Asai

Sakuma

et al. 2005

Journal of the Neurological Sciences

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Clinicopathophysiological differences between dementia with Lewy bodies (DLB) and Alzheimer's disease (AD) remain obscure. Our goals were to determine whether characteristic findings of electroencephalogram (EEG) power and coherence in DLB and a differential pathophysiological mechanism of quantitative EEG existed between DLB and AD. The group consisted of 15 patients with AD or DLB and 12 age-matched controls. Original EEG signals were recorded from 14 scalp electrodes positioned according to the International 10-20 System, using digitally linked earlobes as a reference. Although EEG power spectral analysis showed increasing EEG power density in patients with DLB in the delta and theta bands, such a difference did not exist in patients with AD. Compared with AD, the delta and theta band intrahemispheric coherence values in the fronto-temporo-central regions were higher in DLB. In the beta band, AD was lower than DLB in almost all temporo-centro-parieto-occipital regions. Comparing the mean power value between patients with/without donepezil treatment, there was a significantly lower EEG power density in the delta and theta bands in DLB subjects taking donepezil than in subjects not taking donepezil, whereas there was no significant difference in AD patients. These results suggest that cholinergic dysfunction is stronger in DLB than AD.

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Section: Introductionmentioning

confidence: 99%

Quantitative electroencephalogram analysis in dementia with Lewy bodies and Alzheimer's disease

Kai

Asai

Sakuma

et al. 2005

Journal of the Neurological Sciences

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“…Dyslexia, a developmental disorder of reading, is commonly treated as a heterogeneous syndrome, as are the results of the EEG coherence studies. One of the earliest studies was made by Sklar, Hanley, and Simmons (1972) in which 12 dyslexic children and 13 healthy children had to perform various mental tasks including reading word lists and text. Sklar et al found higher coherence within hemispheres (intrahemispheric) and lower coherence between hemispheres (interhemispheric) in dyslexics than in normals during text processing.…”

Section: Clinical Studies On Dyslexiamentioning

confidence: 99%

The contribution of EEG coherence to the investigation of language

2003

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The contribution of EEG coherence analysis to the investigation of cognition and, in particular, language processing is demonstrated with examples of recent EEG studies. The concept of EEG coherence analysis is explained, and its importance emphasized in the light of recent neurobiological findings on frequency-dependent synchrony as a code of information processing between nerve cell assemblies. Furthermore, EEG coherence studies on naturally spoken and written word and sentence processing are reviewed and experimental results are presented giving new insights into the occurrence of ''transient functional language centers'' within the brain.

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“…In addition to the studies on the TM programme, EEG coherence data have been used for clinical diagnosis (e.g. Sklar, Hanley, and Simmons, 1972), to study waking and sleep phases (e.g. Dumermuth, Walz, Scollo-Lavizzari, and Kleiner, 1972), and to investigate hemispheric information processing (e.g.…”

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confidence: 99%