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The Extreme Solar Events in October-November 2003 and Their Possible Influence on Functional State of the Human Brain
Babaev E.S., Allahverdiyeva A.A.,
In this paper we have studied the influence of violent Sun-Earth connection events of October-November 2003 on human brain activity and its functional state. Daily monitoring of space weather parameters and available solar-geophysical data for the considered period (23 October - 5 November 2003) were used in our continuous experiments. Special attention was given to the days of 24-26 October, 29-30 October, 30-31 October and, and particularly, to 4 November 2003. We have studied the influence of geomagnetic storms on the human brain activity of practically healthy adult women patients (permanent group of the age of maturity) at states of relaxation, during photo-stimulation and in hyper-ventilation. Results of the electroencephalogram (EEG) investigations were used as the most objective method reflecting functional state of the human brain. Parallel registration of the electrocardiogram (ECG) was conducted. Holter method of EEG-registration was used to record the bioelectrical activity of brain with subsequent processing of data by the help of special software. This method allowed conducting investigations of free behavior of the tested person at implementation of a routine activity. Native records of EEG, which were obtained for each patient under the test, after removal of artefact (hindrance) segments, were subjected to the computer analysis and gave the frequency and amplitude cartograms for different functional conditions, reflecting features of the human brain functioning at comparatively quiet days and at days with strong geomagnetic storm. During periods of strong geomagnetic disturbances for the major part of patients under test, as a rule, were recorded indisposition, weakness, of presence is indistinct localized headaches. In most cases bioelectric activity of the human brain was characterized by slowing-down of frequencies of dominating rhythm, by strengthening of expressiveness of a slow-wave component (mainly a theta-rhythm) and by increase in amplitude of activity. The form of waves has got the pointed (sharp) shape and amplification of process of synchronization of activity as well as smoothing inter-zonal distinctions was observed. For the part of examined patients diffuse synchronization was traced on frequency ranges of an alpha-rhythm (clearly expressed in occipital sections and in temporal areas). Reactance of activity was weakened, reactions of mastering of a rhythm were observed on lower frequencies of an alpha-rhythm range. Flashes of both pointed and sharp alpha and theta-rhythms, exceeding on amplitude a background, were observed during hyperventilation process. Picture of correlation relations inherent to various functional states was infringed and of inter-parencephalon asymmetry was marked. Temporal area of the right hemisphere (parencephalon) has got a leading role in interrelations. Activation of rostral-temporal and caudal-temporal connections of the right hemisphere was marked. Obtained results show that there are significant changes in the functional activity of the human brain during the days with strong geomagnetic storms which reflect infringement of functions of both central integrative mechanisms and local processes of the human brain regulations. Disturbances of the geomagnetic conditions can affect human organism, having an effect on functional activity of a brain, changing its background state. It is established that, alongside with the detected specific changes, complex of nonspecific shifts on the EEG reflects disorganization of functional activity of the cortex of large hemispheres of the human brain at geomagnetically disturbed days, which is most likely connected with dysfunction of integrative subcortical systems, with misbalance of its ascending synchronizing and desynchronizing influences.