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Biomedical subjects

V G Grigorian

Publications and source records attributed to V G Grigorian.

35 records · Page 2Linked to original sources
PubMedDate not supplied

[Role of the right brain hemisphere in training for the operator work].

Functional state of the human right brain hemisphere was studied during simulation of 4-hour operator's training work with a computer in novel conditions. Participants of the experiments differed in the degree of extraversion and baseline level of cortical activity. The obtained results suggest that the role of the right hemisphere in the process of simulated activity consists in reception and primary processing of information. This hemisphere is not involved in the correction of cortical activation to the optimal level of activity, which is necessary for the efficient performance of a task.

Adult↗
PubMedDate not supplied

[The study of interhemispheric asymmetry in spatial-perceptive problem solving].

Features of brain interhemispheric asymmetry during solving the spatial figurative task (maze model) were studied in men and women with different intelligence quotients (IQ). It was shown that during task solving the rate of information processing was higher in the right brain hemisphere, and amplitude characteristics of the event-related potentials were higher in the left hemisphere. No gender and IQ differences in the character of interhemispheric interaction were found during the realization of the maze-model task. The results testify that the character of hemispheric interaction depends om the task rype rather than gender and intelligence level.

Adolescent↗
PubMedDate not supplied

[Effects of spatial-imagery task performance on the heart rate variability].

Effects of the efficiency of spatial task performance on the autonomic heart control were studied. Dynamic changes in autonomic balance diagnosed on the heart rate variability during maze-model task performance (the type of spatial-imagery activity) showed that the type of heart rate regulation depended on the performance efficiency. The results suggest that in subjects with low performance efficiency, problems in performance are associated with negative emotions that produce the emotional psychogenic stress. In subjects with high efficiency, the autonomic contour of the heart rate regulation prevailed. This was presumable associated with the adequacy of the maze-model task.

Adolescent↗
PubMedDate not supplied

[Impact of aggressive assigment performance on the autonomic nervous systems in adolescents].

Impact of aggressive assignment performance on cardiac rhythm was studied in adolescents, by taking into account permanent aggressiveness and autonomic tendency in the examinees. The adolescents with high baseline aggressiveness were found to have a lower Kerdo autonomic index while the latter was not observed in those with low baseline aggressiveness. Aggressive computer games have been ascertained to have no negative impact and to have a beneficial effect on the adolescents' psychoemotional sphere.

Adolescent↗
PubMedDate not supplied

[Alteration in activities of NAD-glycohydrolase, acid and alkaline phosphatases in blood cells tuberculosis].

Activities of NAD-glyconydrolase from erythrocytes, alkaline and acid phosphatases from neutrophiles and acid phosphatase from lymphocytes were studied in patients with pulmonary tuberculosis as well as in experimental animals. Distinct alterations in the activity of the enzymes studied were observed in blood cells of guinea pigs inoculated with tuberculosis. In patients with active pulmonary tuberculosis activities of acid and alkaline phosphatases were altered in leukocytes and the activity of NAD-glycohydrolase--in erythrocytes. Inactive forms of tuberculosis were accompanied by a slight alterations in the alkaline phosphatase activity, activities of acid phosphatase and NAD-glycohydrolase were unaltered.

Acid Phosphatase↗
PubMedDate not supplied

[Variability of the morphological traits in the blood-sucking black fly Odagmia caucasica (Diptera: Simuliidae)].

Eleven morphometric and four qualitative features of larvae, as well as 6 morphometric parameters of pupae of Odagmia caucasica, which had been collected in 5 geographically remote regions of Armenia, have been studied. In this work besides absolute values of features we have used their ratios (indices) that shows forms and proportions of different organs. It was found, that larvae taken from Bzhni and Getashen had asymmetry of bilateral characteristics and that there were differences in the level of morphometric features variability; the latter fact is connected with sex and phase of the insect. Study of chronological variability of populations from Bzhni, Getashen and Martuni has revealed differences in the nature of distribution of features. It was shown that the rate of differentiation between geographically isolated populations fluctuated in the range from 20 (Getashen) to 33% (Amassiya). Differences in the qualitative alternative features and in the rate of microsporidium infection distinguish the differentiation of populations from Bzhni and Amassiya, which is caused by anthropogenic factor in Bzhni and by isolating landscape barrier in Amassiya. Species-specific morphometric features were discovered; these were the indices of proportions of larva ventral sclerite and of pupa respiratory filaments.

Animals↗
PubMedDate not supplied

[The individual typological characteristics of operator activity during long-term monotonous work on the computer].

Individual neurophysiological and psychophysiological characteristics were analyzed in two groups of subjects with different extraversion and genetically determined levels of cortical activity during learning the novel for them monotonous computer operation. Most of the subjects improved their performance to the end of four-hour work. The degree of visual fatigue correlated with changes in P70 component of the evoked potentials. The intergroup difference was revealed in overcoming the visual discomfort during attention concentration. The visual cortex was facilitated in the introverts with high-voltage cortical activity (1st group) and disfacilitated in the extraverts with the low-voltage cortical activity (2nd group). Increase of the simple motor reaction time in the extraverts is considered as a result of temporary impairment of the visual function during the monotonous operator's work, and the worsening of the emotional condition as a consequence of the visual discomfort. The problems are discussed concerning different adaptation mechanisms in realization of the activity under study depending on the genetically determined features of the CNS.

Adaptation, Physiological↗