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A O Bryzgalov

Publications and source records attributed to A O Bryzgalov.

6 recordsLinked to original sources
PubMed2006

Frequency-spatial organization of brain electrical activity in creative verbal thought: the role of the gender factor.

Gender-related differences in the EEG correlates of creative thought were studied by mapping EEG power during performance of a Remote Associations Task as compared with verbal word-generation and simple association tasks. Right-handed students (18 male, 21 female) took part in the studies. Gender-related differences were seen in the factor structure of measures of verbal activity and in the larger number of words generated for a given letter in women than in men. In terms of the originality of the associations, men and women showed no significant difference, though the dynamics of the power of the beta-2 rhythm during creative thought differed. In males, the search for original associations was accompanied by increases in beta-2 power in both hemispheres at the initial stages of performing the task, with local increases in the beta-2 rhythm in the central parts of the cortex at the end of testing. In women, the increase in beta-2 power was initially greater in the right hemisphere than the left, while there was a relative decrease in beta activity in the parietal-temporal areas of the cortex and an increase in the left anterior frontal areas at the terminal stage of task performance. It is suggested that creative verbal thought is based mostly on an "insight" strategy in males, while women additionally use an "intellectual" strategy.

Adolescent↗
PubMedDate not supplied

[Sex differences in EEG power changes in retention of dichotically and monaurally presented verbal stimuli].

EEG power mapping was used to study gender differences in hemispheric functional organization during memorizing dichotically and monaurally presented verbal information. Right-handed students (12 men and 14 women) participated in experiments. The EEG was recorded from 16 electrodes placed at homologous sites of the left and right brain hemispheres. Task-related changes in the thetal power in men differentiated between monaural presentations to different ears, i.e., situations of oppositely directed attention. In women the thetal power reactivity (the difference between the band power logarithms under baseline conditions and in task interval) differentiated between dichotic and monaural presentations of words, i.e., situations with different memory loads. Gender differences were also found in the alpha frequency band. Power changes in the alpha 1 band in all memory tasks and power changes in the alpha 2 were more evident in the right hemisphere in men but in the left hemisphere in women. In contrast, in the posterior temporal lead the alpha 2 power reactivity in men was higher in the right hemisphere, whereas in women the lateral differences were absent. As compared to men, the alpha 2 desynchronization in women was also more pronounced in posterior regions of both hemispheres. There were no gender differences in efficacy of memorizing. It is suggested that different processing strategies rather than different behavioral performance may be responsible for the revealed specific spatiotemporal EEG patterns.

Adult↗
PubMedDate not supplied

[Gender differences in EEG coherence during memorization of dichotically and monaurally presented verbal stimuli].

Gender differences in changes of coherence values in the theta and alpha frequency bands during encoding of dichotically and monaurally presented verbal information were studied. Right-handed students (14 male and 14 female subjects) participated in experiments. The EEG was recorded from 16 electrodes placed at homologous sites of the left and the right hemispheres. In male subjects, numerous differences in coherence values between conditions of dichotical and monaural word presentation were found in the theta2- and alpha1-bands, in females, the differences were most pronounced in the theta1- and theta2-frequency bands. Numerous differences in coherence values differentiated between dichotic and left-sided monaural presentations in males and between dichotic and right-sided monaural presentations in females. As compared to dichotic presentation, in condition of the monaural presentation, higher coherence values were observed in men and lower in women. The features of gender differences in frequency-spatial patterns of changes in EEG coherence values under conditions of bilaterally and unilaterally directed attention in male and female groups may testify that female subjects predominantly use right-hemispheric processing strategy, whereas male subjects use, mainly, left-hemispheric strategy for selection and memorization of concrete nouns.

Adult↗
PubMedDate not supplied

[Antiarrhythmic activity of alaglyzin].

The activity of alaglyzin, a new drug based on a clathrate complex of allapinine (well-known antiarrhythmic) with glycyrrhizic acid (GA), was studied on the models of arrhythmia induced by itraperitoneal injections of calcium chloride (CaCl2) and adrenaline (epinephrine) in rats. Alaglyzin is less toxic than allapinine (LD50 70 and 6 mg/kg, respectively), and the effective dose of the parent compound in the complex form is also about 12 times lower than that in the reference drug. The experiments showed a dose dependent action of alaglyzin. Pretreatment of the experimental animals with alaglyzin in a dose of 0.25 mg/kg prevented from the arrhythmia development in both tests, while a dose of 0.125 mg/kg was effective only in the CaCl2, test.

Aconitine↗
PubMedDate not supplied

[Gender-related differences in EEG coherence in Stroop task].

Gender-related differences in EEE coherence were studied in young male and female university students during performance of Stroop task, in which color and word could be congruent or incongruent and spatially integrated or separated. The most clear-cut gender-related differences in the EEG coherence were revealed in the alpha2 and beta frequency bands. In the alpha2 band, gender-related differences in the interhemispheric coherence were associated with spatial characteristics of stimuli: left or right presentation and features of mutual localization of relevant and irrelevant stimuli. These differences were observed when information was addressed to the left hemisphere. Gender-related differences associated with spatial organization of stimuli were also observed for intrahemispheric beta1 coherence. Under conditions of the spatial separation of relevant and irrelevant stimuli, only females demonstrated enhancement of coherence in response to the right-side stimulus presentation as compared to the left-side presentation. It was shown that, during the differentiation of the semantic meaning of verbal stimuli, gender-related differences were caused by the features of integration of beta2 oscillators in the posterior cortical regions. The results are indicative of qualitative gender-related differences in organization of both frontoparietal and lateral attention systems in actualization of selective processes.

Adolescent↗