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Peculiarities of organization within the control left-handed (according to interhemispheric EEG coherence)

Keywords:

L. V. Cherenkova – Post-graduate Student, Physiology Department, Kuban State University of Physical Culture, Sports and Tourism (Krasnodar). E-mail: tsarlu@mail.ru E. M. Berdichevskaya – Dr.Sc. (Med.), Professor, Physiology Department, Kuban State University of Physical Culture, Sports and Tourism (Krasnodar). E-mail: emberd@mail.ru


The neurophysiological basis of identity formation is made by the individual profile of asymmetry (IPA) reflecting background specifics of interhemispheric relationship of an individual. The basic component of motor functions of a person is the vertical pose. Symmetry  asymmetry of motor activity is also inseparably linked with a functional profile of the lateral brain organization and characterizes both uni – and bilateral functions which carry various poses relate to. The concept of multilevel control of spontaneous movements opens hierarchy of the intercentral interaction, but the question on specifics the interhemispheric communications in realization of various poses at people with accurately established IPA remains open. Sixteen unexercised young men with «left» and «mainly left» IPA (according to the scheme: hand – a foot – sight – hearing) synchronously registered dynamics of internal and external structure at pose change: «sitting» with the closed, open eyes, and also at «standing» pose in Romberg's test and the «Target» test. The telemetric electroencephalograph «Entsefalan-EEGR-19/26» and the two-platform computer stabilograf «Stabilan-01» (NPO Medikom and EDB «Rhythm», Taganrog) were applied [3]. The interhemispheric coherence (KOG MT) was measured for θ-, δ-, α-, β1-and β2– ranges of rhythms of EEG in assignments of Fp1-Fp2, F3-F4, C3-C4, P3-P4, T3-T4, O1-O2 [2]. Assessments of reliability of distinctions were carried out with the help of a nonparametric method for the connected samples. The nature of reorganizations in the interhemispheric communications is considered at forming pose. So, in «sitting» pose – upon transition from closed to open eyes (OE) – MP Kog at lefthanders decreases in θ-and α-range in frontal, central, parietal and temporal regions, but increases in β2 – range in temporal areas, confirming the expressed reciprocal for the fast and slow fluctuations, previously revealed at spontaneous manual movements of left-handed people. Verticalization with OE isn't accompanied by reliable jet reorganizations of MP Kog EEG. Before we also showed smaller variability and bigger regional variability of dynamic interhemispheric communications at various stages of performance of manual actions at lefthanded people in comparison with right-handed people [1]. The received EEG-data confirm the coordinated activity of hemispheric in order to implement of the pose control, however the picture of reorganizations of patterns of interhemispheric coherence differs significantly from the previously mentioned at investigations with «absolutely right» IPA.
References:

  1. Berdichevskaya Ye.M. Funktsional'naya mezhpolusharnaya asimmetriya i sport // Funktsional'naya mezhpolusharnaya asimmetriya. Khrestomat. M.: Nauchnyy mir. 2004. S. 636-671. http://cerebral-asymmetry.narod.ru/FMA_book.htm
  2. Bobrova Ye.V. Sovremennye predstavleniya o korkovykh mekhanizmakh i mezhpolusharnoy asimmetrii kontrolya pozy // Zhurnal vysshey nervnoy deyatel'nosti. 2008. № 1(58). S. 12-27.
  3. Levik Yu.S. Stabilografiya v issledovaniyakh upravleniya pozoy // Izvestiya YuFU. Tekhnicheskie nauki. Tematicheskiy vypusk. «Meditsinskie informatsionnye sistemy». Taganrog: Nauchnoe izdanie TTI YuFU. 2008. № 6(83). S. 108-112.

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