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The Functional Role of Neocortical Activity in the Processes of Interregional Interaction

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In the context of concepts of the mechanisms of human cognitive activity addressing the functional role of neocortical gamma activity in these processes, scientific progress in the 21st century has involved at least three logically linked new directions: 1) combined recording of high-frequency oscillations in the gamma range (90–150 Hz) and functional magnetic resonance imaging has demonstrated a close correlation between the power levels of these oscillations at the recording site and the levels of blood oxygenation (BOLD responses – blood oxygenation level-dependent) in the corresponding areas, providing for assessment of power dynamics in relation to metabolic resources; 2) results of parallel evaluation of measures of gamma activity (frequency, bandwidth, amplitude) combined with both the magnitudes of BOLD responses and GABA concentrations measured by magnetic resonance spectroscopy have provided grounds for a new hypothesis relating to a subject’s individual characteristics; and 3) new methods for measuring the phase synchronicity of gamma frequencies have led to the discovery of the phenomenon of cross-frequency interactions between the phases of gamma oscillations and theta and alpha waves. A number of authors have regarded this phenomenon as the basis for interaction between different areas, mediated by various neural networks, which may bring us towards an understanding of various aspects of the question of the mechanisms of cognitive processes.

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

    V. N. Dumenko

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Translated from Zhurnal Vysshei Nervnoi Deyatel’nosti imeni I. P. Pavlova, Vol. 64, No. 1, pp. 3–20, January–February, 2014.

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Dumenko, V.N. The Functional Role of Neocortical Activity in the Processes of Interregional Interaction. Neurosci Behav Physi 45, 239–251 (2015). https://doi.org/10.1007/s11055-015-0063-2

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