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Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2012

In a group including 74 adults of both sexes, we examined interrelations between the locus of psychological control (diagnosed using the Rotter questionnaire) and parameters of event-related EEG potentials, ERPs, recorded in the course of performance of two behavioral test acts with a motor component. Task A corresponded to maximally fast pushing on the button after a signal with warning; the time of the sensorimotor reaction was measured. Task B included internal counting of a definite time interval limited by two pushings on the button. Under these conditions, we recorded the contingent negative variation (CNV), the P300 potential, and, in task B, the readiness potential (RP). EEG leads C3 and C4, according to the 10-20 system, were used. Internals (estimates by the questionnaire, 6 stens or higher) were characterized by higher amplitudes of the terminal CNV (CNV-T), integral CNV, and P300 in task A, by greater RP and CNV amplitudes in task B, and also by shorter reaction times and their smaller dispersion. It should be supposed that the corresponding peculiarities of the neurodynamic constitution of an individual are determined, to a considerable extent, by the specificity of organization and functioning of a few neurotransmitter (aminergic in particular) and neurohumoral systems. © 2012 Springer Science+Business Media, Inc.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2012

We studied spatial organization of ongoing EEG activity in 60 adults of both sexes using multichannel recording and estimation of the coherence of EEG oscillations in different cortical loci. Behavioral types of the personality were qualified using the Jenkins questionnaire; opposite types A and B and an intermediate type AB were differentiated. Recording of EEG (21 leads, localization of the electrodes according to the 10-20 system) was performed in the resting state with the eyes closed. The subgroup of subjects belonging to the AB behavioral type, despite high interindividual variability, was in general characterized by greater values of the coherence coefficients Kcoh of low-frequency (δ and θ) oscillations. The subgroup of persons of the "coronary" behavioral type A demonstrated, as a whole, greater mean values of the Kcoh for α and β1 oscillations, while greater values of this coefficient for γ activity were found in type-B persons. Values of the Kcoh calculated for the entire EEG spectrum were higher in type-A subjects. The latter individuals differed significantly from type-B persons by smaller Kcoh values for δ oscillations in the Fp1-F3 lead pair, for γ oscillations, in the T3-T5 pair, and for α oscillations, in the O1-O2 pair. Simultaneously, greater Kcoh values in these subjects (type A) for the θ; rhythm were found in the C3-C4, P3-O1, and C4-P4 pairs; similar differences for the α range were found in the P3-O1 and P4-O2. For β1 oscillations, this was observed in the C3-C4, F3-C3, P3-O1, and C4-P4, and for β2 oscillations, in the C3-C4 pair. Thus, a greatest number of significant differences between the K coh values in persons of the behavioral types A and B were observed for oscillations of the θ;, α, and β1 ranges with an emphasis in the C3-C4 and P3-O1 lead pairs. © 2012 Springer Science+Business Media New York.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2012

In a group including 65 adults of both sexes, we examined correlations of the internal/external personality type (locus of psychological control diagnosed by the Rotter questionnaire) with parameters of the EEG frequency components (rhythms). Multichannel recording of ongoing EEG was carried out in the resting state; leads were located according to the 10-20 system. Despite natural high interindividual variability, the subgroup of internals was, in general, characterized by higher spectral powers (SPs) of the δ, θ, α, and β1 rhythms and a lower SPs of β2 and γ oscillations recorded in the resting state with the eyes closed. In internals, the modal frequencies of practically all EEG ranges were, on average, somewhat lower. In this subgroup, reaction of EEG activation related to opening of the eyes was stronger, while the interhemisphere asymmetry was weaker. © 2012 Springer Science+Business Media, Inc.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2012

By analyzing the coherence of EEG activity, we examined the spatial organization of the latter in 60 adults of both sexes characterized by dissimilar levels of different aspects of aggressiveness and hostility (diagnosed using the Buss-Durkee and Il'yin questionnaires). Recording of EEG (21 leads positioned according to the 10-20 system) was carried out in the resting state. The greatest numbers of aggressiveness level-related differences in the coherence level (values of the coherence coefficient, K coh) were found for oscillations of the β and γ ranges. Despite the high natural interindividual variability, the subgroup of persons with a high level of aggressiveness was characterized, in general, by somewhat smaller values of K coh for the δ and θ ranges (in particular in the P4-O2 pair) and greater values of K coh for the β1 and β2 rhythms (with an accent in the C3-P3 pair) and γ range (maximum differences in T3-T5). The subgroup of persons with a high level of hostility was distinguished by smaller K coh of δ, θ, and γ oscillations and greater K coh for the β range in pairs F8-T4 and F7-T3. Aggressive persons demonstrated greater, in general, numbers of low-coherence relations, especially in the δ and θ spectrum segments. The subgroup with domination of autoaggressiveness was characterized by several significantly lower values of K coh for the δ and θ ranges. © 2012 Springer Science+Business Media, Inc.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2013

When studying the spatial organization of ongoing EEG, we calculated the coefficients of coherence, Kcoh, in 60 healthy adults of both sexes characterized by different locus of subjective control, LC. The latter psychological trait was diagnosed using the Rotter questionnaire. Recording of EEG (21 leads; positions of the electrodes according to the 10-20 system) was performed in the resting state with the eyes closed; Kcoh values were calculated for 20 lead pairs. Despite natural high interindividual variability, greater Kcoh values for oscillations of all EEG frequency ranges and for the entire EEG spectrum (especially in fronto-central leads) were more frequently observed in the subgroup of subjects with internal LC (internals). Externals were characterized by greater numbers of relations with low K coh values, while moderate and significant levels of coherence, especially for high-frequency EEG rhythms, were more typical of internals. The latter subjects more frequently and significantly differed from externals by greater Kcoh values in lead pairs F3-C3, F4-C4, and Fp2-F4. In pairs O1-O2 and P4-O2, Kcoh in internals were practically always smaller. The index of general internality demonstrated only positive correlations with the Kcoh values for δ, β, and γ EEG oscillations. © 2013 Springer Science+Business Media New York.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2011

In a group including 72 adults of both sexes, we studied correlations between the estimates of the so-called coronary-prone personality type (type A) diagnosed using the Jenkins questionnaire and the spectral powers (SPs) of the frequency components (rhythms) of background EEGs recorded in the resting state (leads C3 and C4 according to the 10-20 system). Despite natural high interindividual variability, estimates that characterized the subject as belonging to the behavioral type A corresponded, on average, to relatively low SPs of the δ, θ, and α EEG components, intermediate values of the β1 rhythm SP and coefficient of reactivity of the α rhythm, and higher SPs of the high-frequency (β2 and γ) rhythms. Estimates characterizing type B personality corresponded to significantly higher δ-rhythm SPs, intermediate SPs of the θ and α rhythms, and smaller SPs of the β and γ rhythms. The interhemisphere asymmetry coefficient for the α rhythm was usually negative in type-A individuals and positive in the cases of types B and AB. The peculiarities observed are probably determined, to a certain extent, by the fact that both the characteristics of the behavioral types of the personality and the amplitude parameters of EEG rhythms depend significantly on inherited (in particular neurochemical) factors. Such peculiarities of the neurodynamic constitution of the individual are determined, to a considerable extent, by the specificity of organization and functioning of a few neurotransmitter (in particular aminergic) and neurohumoral systems. © 2011 Springer Science+Business Media, Inc.


In a group of 118 adults of both sexes, we studied modulation of the low-frequency EEG components (δ and θ rhythms) under conditions of an activation reaction resulting from opening of the eyes. Typical changes of the α rhythm (considerable depression in a great majority of the tested subjects) was accompanied by diverse, in their direction, shifts of the spectral power (SP) of the δ and θ components in different subjects. The δ rhythm power increased upon the reaction of activation in 79 subjects and decreased in 29 subjects, while changes in this index in different hemispheres were of opposite directions in 10 persons. According to the reactivity of the θ rhythm, the respective subgroups included 36, 75, and 7 subjects. Values of the differential coefficients of reactivity (DCR) for the δ and θ rhythms demonstrated significant positive correlation (r = 0.616 and 0.603 for the left and right hemispheres, respectively). Indices of reactivity of the α and θ rhythms also correlated but less closely (r about 0.3). At the same time, there was practically no correlation between the DCR values of the α and δ rhythms. Within the entire studied group, we found significant negative correlations between the DCRs of the δ and θ activity with the estimates of some psychological characteristics of the subjects (levels of extroversion, psychoticism, ergicity, plasticity, dominance, and a few others) measured using the questionnaires RTS (Strelau), EPQ (Eysenck), OST (Rusalov), and 16 PF (Kettel). We also found positive correlations with the levels of normativity of behavior and development of imagination. At a rather high significance of such correlations, coefficients of the latter were, as a rule, relatively low (usually less than 0.2). Results of dispersion analysis showed that significant or close to significant intergroup differences of the mean values of estimates of psychological characteristics diagnosed according to the above-mentioned questionnaires were typical of the subgroups of subjects with increases and decreases in the SPs of the δ and θ rhythms or with opposite changes of these indices in the hemispheres. Probable mechanisms of modulation of the low-frequency EEG components under conditions of the activation reaction and correlations of such changes with psychological peculiarities of the personality are discussed. © 2011 Springer Science+Business Media, Inc.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2011

In a group of 68 adults of both sexes, we examined correlations between estimates of the psychological adaptability of an individual (diagnosed using a multilevel personality questionnaire, MPQ) and spectral powers, SPs, of the frequency components (rhythms) of background EEG recorded in the resting state (leads C3 and C4 according to the 10-20 system). Despite high individual variability within the group, indices by the scale "communicative potential" demonstrated significant correlation with the SP of the θ rhythm, while estimates of the moral normativity correlated with the SPs of the α and β1 rhythms. Subgroups of the persons classified according to the level of the integral adaptation capability (personality's adaptation potential) differed from each other in the mean estimates of interhemisphere asymmetry of the α rhythm; this index was higher in subjects with the medium/high level of adaptability. The correlations observed are, most probably, determined by the fact that both the level of psychological adaptability of the personality and the EEG amplitude parameters depend significantly on genetic (neurochemical, in particular) factors. Such peculiarities of the neurodynamic constitution of the individual are probably determined, to a considerable extent, by the specificities of organization and functioning of a few neurotransmitter (aminergic, in particular) and neurohumoral systems. © 2011 Springer Science+Business Media, Inc.


Konareva I.N.,Vernadskii Tavricheskii National University
Neurophysiology | Year: 2011

In a group of 68 adults of both sexes, we examined correlations between the level of psychological adaptability of the personality (diagnosed using the Maklakov questionnaire) and parameters of event-related potentials (ERPs) recorded in the course of performance of two behavioral test acts including a motor component. In task A, it was necessary to maximally rapidly press the button after an imperative signal preceded by a warning signal, while a definite time interval (limited by two pressings of the button) should be measured in task B. Parameters of the contingent negative variation, CNV, potential P300 and, in task B, readiness potential, RP, were measured in C3 and C4 leads. High amplitudes of ERPs (RP, P300, and CNV in task A) and smaller variability of the indices of working efficiency corresponded, in the whole, to higher estimates of psychological adaptability in general and of separate aspects of the latter estimated according to the scales of the used questionnaire. Probable mechanisms of the peculiarities of neurodynamic constitution determining the level of the psychological adaptability of the individual, on the one hand, and of the ERP parameters, on the other hand, are discussed. © 2011 Springer Science+Business Media, Inc.


In a group of 118 adults of both sexes, we studied modulation of high-frequency EEG rhythms (β and γ components) under conditions of EEG activation related to opening of the eyes. Typical changes in the α rhythm (significant depression in the overwhelming majority of the tested subjects) was accompanied by different (in direction and intensity) shifts of the spectral powers (SPs) of the β and γ components in different subjects. The power of the β1 subcomponent under conditions of the activation reaction increased in 6 persons and dropped in 109 persons; changes in this index in two hemispheres were opposite in their directions in 3 subjects. Thus, changes in the β1 SP upon opening of the eyes were nearly parallel to those of the α rhythm but less intense. The subgroups differentiated according to the pattern of reactivity of the β2 subcomponent included 23, 85, and 10 subjects; for the γ rhythm, the corresponding numbers were 31, 72, and 8. In other words, the patterns of reactivity of β2 and γ oscillations were rather similar to each other but differed significantly from the pattern for the β1 rhythm. Values of the differential coefficients of reactivity (DCRs) of the β1, β2, and γ rhythms demonstrated significant correlations that were especially close for the β2 and γ activity. Within the entire examined group, we found significant negative correlations of the DCR values for β and γ activities with the estimates of some psychological characteristics of the subjects (levels of neuroticism, psychoticism, plasticity, self-control of behavior, and some others) measured using the RTS (Strelau), EPQ (Eysenck), OST (Rusalov), and 16PF (Kettel) questionnaires. The dispersion analysis demonstrated that the above-mentioned subgroups of the subjects (with increase and decrease in the SPs of the β and γ rhythms in both hemispheres and opposite changes of these indices in the right and left hemisphere) showed significant or close to significant specific intergroup differences of a few mean values of the psychological characteristics estimated according to the above questionnaires. Possible mechanisms of modulation of high-frequency EEG components under conditions of the reaction of EEG activation and relations of such changes to the psychological characteristics of the personality are discussed. © 2011 Springer Science+Business Media, Inc.

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