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Atypical Forms of Cerebral α-Activity in the Case of Lesions in Regulatory Structures of the Human Brain

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Abstract

The results of the EEG study of patients with tumor lesion of diencephalic (29 subjects) and limbic (25 subjects) structures with the focus on the analysis of structural and functional organization of α activity have been summarized. It has been found that diencephalic structure dysfunction is accompanied by disorder of α-rhythm spatial organization in the form of generalization or translocation of its focus to the frontal regions of the cerebral cortex. Distinctive features of “diencephalic” type alteration of α rhythm are determined by predominant integration of the thalamic or hypothalamic structures into the pathological process. Involvement of the limbic structures, especially at early stages of the disease, induces increase in α-rhythm intensity in the temporal region of the affected hemisphere. The nature of the response of the EEG pattern to the functional stress allows identifying it as a “hippocampal α rhythm”. Implementation of the automatic methods of analyzing plays an important role in the identification of these specified pathologic forms of the α rhythm that are often invisible during visual assessment. Detected atypical forms of α rhythm facilitates the interpretation of hemispheric asymmetry of the EEG in patients with cerebral pathology.

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Authors and Affiliations

  1. Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia

    G. N. Boldyreva

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Correspondence to G. N. Boldyreva.

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Original Russian Text © G.N. Boldyreva, 2018, published in Fiziologiya Cheloveka, 2018, Vol. 44, No. 3, pp. 14–26.

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Boldyreva, G.N. Atypical Forms of Cerebral α-Activity in the Case of Lesions in Regulatory Structures of the Human Brain. Hum Physiol 44, 246–256 (2018). https://doi.org/10.1134/S0362119718020032

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