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Background Activity of the Cerebral Cortex and Superficial Muscles of the Fingers in Men with Different Levels of Individual EEG a-Frequency

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Journal of Life Sciences 2013年第10期7卷 1048-1052页

作者： Morenko Alevtyna Grigorivna pavlovych olga sergiyivna Kotyk Olena Adamivna Dmytrotsa Olena Romanivna Kotsan Ichor Yaroslavovych Lesia Ukrainka Eastern European National University Lutsk 43001 Ukraine

A test group consisting of 104 healthy men from the ages of 19 to 21 was divided into two groups according to the magnitude of their IAF （individual EEG Gt-ffequency） median--groups with high （n = 53, IA 〉 10.04 Hz） and low （n = 51, IAF 〈 10.03 Hz） levels of IAF. Differences between the groups in terms of the power and coherence of EEG oscillations and the EMG signal average amplitude at rest were estimated. It was found that the dominant role of the thalamocortical interactions （thalamus and cortex） in the group of testees having a high IAF causes the greater differentiation and rationality of the downstream effects on muscles and provides more economic baselines and contractile capabilities of the leading hand flexor muscles. Increased non-specific influences of the limbic system and reticular formation in providing the testees＇ cortical activity under conditions of a low frequency are accompanied by a smaller lateral and reciprocal specificity in the downstream impacts, and by a lower performance of supraspinal irmervations.

关键词： Functional status of rest individual alpha-frequency EEG power and coherency muscle tone.

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Cortical Arousal Strategies in Left-Handers during the Aural Perception and Manual Playback of Mono-and Polyphonic Rhythmical Patterns

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Journal of Life Sciences 2012年第12期6卷 1408-1413页

作者： pavlovych olga sergiyivna Morenko Alevtyna Grigorivna Kotyk Olena Adamivna Vlasjuk Svitlana sergiyivna Lesia Ukrainka Volyn National University Lutsk *** Ukraine

The actual purpose of this study is to establish the cortical arousal strategies (according to the power of the EEG (electroencephalogram) α-oscillations) during the aural perception as well as manual playback of mono- and polyphonic rhythmical patterns in men with left profile. The study involved 35 men from 19 to 21 years old with the left profile of the manual and aural asymmetries. EEG was recorded in the functional status of rest: during the aural perception and playback of mono- and polyphonic rhythmical patterns with the left and right hand fingers. The monophony in the rhythmical pattern sounding relative to monophonic patterns is followed by more expressed and widespread cortical processes of the EEG α-oscillation depression. Given patterns indicate a greater intensity of ascending nonspecific arousal strategies of data processing by men on conditions of the sound and harmonious complications of the pattern structure. The aural perception and playback of rhythmical patterns with both hands were accompanied by the increased significance of arousal processes in the right hemisphere. This may be due to the dominant role of the hemisphere during the formation of the innervation impacts on the left-hander"s neuro-motor apparatus. More differentiated changes in the cerebral cortex were installed during the left hand activation.

关键词：听觉感知左撇子播放手动韵律模式和弦皮层大脑皮质

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