Abstract
Introduction. The study of interhemispheric asymmetry during awakening from different sleep stages remains relevant. This study is the first effort to identify interactions of cortical-subcortical systems that function simultaneously. This study aims to detect interhemispheric asymmetry during awakening from Stage 2 daytime sleep using amplitude-amplitude coupling of EEG rhythms. We examined cognitive awakening with varying task performance using a psychomotor test model.
Methods. A multichannel EEG was recorded simultaneously with task performance. The EEG was evaluated using the complex Morlet wavelet. The Kendall correlation coefficient was as a measure of the amplitude-amplitude coupling of EEG rhythms.
Results. A large area of asymmetric processes was observed in the left hemisphere during full performance recovery (compared to partial recovery) in the segment closest to the onset of button pressing. Awakening, accompanied by full performance recovery, was characterized by a predominance of delta-range coupling in both hemispheres in the interval of 8-5 sec. The theta and gamma rhythms became dominant in the interval of 4-1 sec. During partial performance recovery, an increase in the number of delta-range coupling was observed in the interval of 4-1 sec compared to the interval of 8-5 sec.
Discussion. Cognitive awakening, accompanied by varying task performance, is characterized by interhemispheric asymmetry as measured by EEG rhythms coupling. This asymmetry is determined by both different localization areas of coupling patterns across the cerebral cortex and different sets of coupling patterns. In two experimental situations, different coupling patterns of EEG rhythms were revealed. Therefore, in a number of regions, unequal interactions between the thalamocortical and cortico-hippocampal systems were found.
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