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Background cerebral electrical activity in healthy mental aging

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Abstract

EEG power mapping in the frequency bands from Δ to γ2 was used to study the changes in the background cerebral activity during “successful” cognitive aging, with the cognitive ability preserved, in subjects engaged in complex occupational activities. The sample consisted of an older age group (OAG) of 32 subjects (14 men and 18 women with a mean age of 65.1 ± 1.18 years) and a younger age group (YAG) of 33 subjects (18 men and 15 women with a mean age of 22.1 ± 0.38 years). The mean power of the slow (Δ, θ, and α2) rhythms decrease with age, and that of the fast (β and γ) rhythms increase with age. The heterogeneity of the power parameters recorded at different sites was decreased in the OAG compared to the YAG. The centro-lateral power gradient was smoothed in the frequency bands from Δ- to β2-, and both the centro-lateral and fronto-parietal power gradients and interhemispheric differences, in the α- and β1 bands in the OAG. The results suggest that the observed age-related changes are prerequisites for the involvement of compensatory mechanisms, which may be related to both mobilization of larger resources ensuring cognitive activity and reorganization of cortical networks in the areas prone to age-related physiological changes.

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  1. Research Institute of Physiology, Siberian Branch, Russian Academy of Medical Sciences, Novosibirsk, Russia

    N. V. Volf & A. A. Gluhih

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Original Russian Text © N.V. Volf, A.A. Gluhih, 2011, published in Fiziologiya Cheloveka, 2011, Vol. 37, No. 5, pp. 51–60.

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Volf, N.V., Gluhih, A.A. Background cerebral electrical activity in healthy mental aging. Hum Physiol 37, 559–567 (2011). https://doi.org/10.1134/S0362119711040207

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