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Biomedical subjects

V S Rotenberg

Publications and source records attributed to V S Rotenberg.

51 records · Page 3Linked to original sources
PubMedDate not supplied

[The role of typological differences in animal behavior during the process of adaptation to extreme situations].

In relation to Cosmos experiments behavioural responses of rhesus monkeys were investigated and compared with their conditioned reflex activities. The animals with a distinct search-oriented behaviour showed a higher rate of recovery of instrumented reflexes, better stability of conditioned-reflex activities to stress-effects and a faster adaptation to them. Extreme effects associated with changes in the experimental environment and rigid fixation inhibited conditioned-reflex activities to a greater extent than strong but short-term exposures followed by tests in a normal environment. It was also demonstrated that variations of the sleep structure in stress situations were largely dependent on typological features of animals.

Adaptation, Physiological↗
PubMedDate not supplied

[Characteristics of night sleep of monkeys on the ground and during space flight on "Kosmos-1667"].

The data on the sleep structure of two rhesus monkeys, Vernyi and Gordyi, during their 7-day space flight on Cosmos-1667 and a control study staged a month after recovery are discussed. Sleep structure was changed to the greatest extent the night before launch when additional stress factors were involved. During the first night in space Vernyi showed the so-called recoil effect. Later his sleep structure became stabilized: the specific weight of fast sleep diminished and the fast sleep/delta/sleep index in the first two cycles decreased. In the ground-based control study, sleep parameters pointed to a deteriorated health status of the animal: his fast sleep patterns changed and delta-sleep often reached its maximum after a fast sleep episode. In this animal adaptation was associated with fast sleep restructuring. In the second primate, Gordyi, the process of adaptation was extended and took three nights. This animal consistently showed low parameters of delta-sleep during both fright and postflight control study; it exhibited no recoil phenomenon after its reduction in the prelaunch night. The structure of sleep indicated that it played a lesser role in the overall process of adaptation.

Adaptation, Physiological↗
PubMedDate not supplied

[Electrophysiologic characteristics of functional interhemispheric asymmetry].

Change of biopotentials spatial synchronization under functional loads addressed predominantly to one or the other hemisphere (correlative analysis of the first EEG derivative of more than two thousands healthy subjects of various age), allowed to single out three phenotypes of hemispheric relations differing mainly by different types of information processing: right-hemispheric, left-hemispheric or mixed. Expressed EEG activation in both hemispheres (judged by alpha-index change) is manifest when the subject is presented with a task, the context of which does not correspond to the initially dominating type: in right-hemispheric--at solution of tasks, oriented to logical-verbal context and in left-hemispheric--to spatial-image one. The high level of non-specific EEG activation may be considered as an attempt of compensation of relative functional insufficiency of the right hemisphere systems in initially left-hemispheric or left-hemisphere systems in right-hemispheric individuals.

Adolescent↗
PubMedDate not supplied

[Factor analysis of the structure of nocturnal sleep and the results of psychodiagnostic examination in man].

Factor analysis was carried out of sleep structure and results of complex psychodiagnostic study in 35 subjects. Seven orthogonal factors were singled out. It is shown that alarm level is connected with fast sleep general presentation; the system of psychological defences is linked with the fast sleep in the second cycle; the self-control in alert state and the transfer from alertness to sleep are interrelated, and duration of the first and last sleep cycles are reciprocally connected.

Cattell Personality Factor Questionnaire↗
PubMedDate not supplied

[Galvanic skin response as a reflection of the decision-making process when time is insufficient].

Amplitude and latency of skin galvanic response ( SGR ) was studied in 15 healthy subjects in two experimental programs. The first program demanded to perform a motor act as quickly as possible if all the three signals were the same, the second one demanded a motor act if at least one of the signals differed from the other two. Following series of signals were presented: 1--all the three signals being the same, 2--the first one differed from the others, 3,4--correspondingly, the second or the third signal differed from the others. The amplitude of SGR was found to increase, and its latency was found to decrease when the decision was taken under the conditions of time deficit. Thus, SGR reflects the process of decision taking rather than pretuning of the motor act.

Adolescent↗
PubMedDate not supplied

[Changes in sleep with different types of reaction to emotional stress].

Polygraphic study of night sleep, carried out on 21 students the night after an examination and one night after vacations, revealed two types of reactions to an emotional stress. It has been shown that in the case of a rapid normalization of vegetative and electromyographic manifestations following the end of an emotional stress impact, the structure of night sleep remains unchanged. When manifestations of the emotional stress persist after the elimination of the stress situation, the amount of the rapid sleep in the following night increases. It is suggested that the differences noted are related to different types of anxiety stress.

Adult↗