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Biomedical subjects

S B Tsvetovskiĭ

Publications and source records attributed to S B Tsvetovskiĭ.

10 recordsLinked to original sources
PubMedDate not supplied

[Dissociation of reproduction of conditioned vegetative and motor reactions during retrograde electroconvulsive amnesia].

It has been shown in chronic experiments on rats that electro-convulsive action applied in five to ten seconds after one-session conditioning completely precludes the reproduction of conditioned motor reactions, while conditioned bradycardiac reactions are clearly reproduced in tests one hour and 24 hours after elaboration. Unconditioned stimulus presented in another experimental situation six to seven days after elaboration and amnesic action, leads to a stable reproduction of the previously non-achieved conditioned motor reactions. The results obtained suggest that electrical seizures influence the reproduction of motor reactions, rather than fixation of temporary connection.

Amnesia↗
PubMedDate not supplied

[Reproduction of the electrophysiologic correlates of a conditioned defense reflex following electroconvulsive activity].

Acute and chronic experiments on cats have shown the possibility of obtaining in one session conditioned EEG-responses and vegetative changes as well as conditioned motor reactions time-locked to the moment of the unconditioned pain stimulation omitted during testing. Electro-convulsive stimulation directly after elaboration prevents the appearance of conditioned motor reactions, while conditioned EEG and vegetative changes are retained after electric seizures. A conclusion has been drawn that the emotional component of conditioned reactions is not subjected to the amnestic effect of electro-convulsive action.

Amnesia↗
PubMedDate not supplied

[Effect of destruction of the amygdaloid complex on the cardiac and motor components of a conditioned defense reaction].

The effect of bilateral ablation of the amygdala complex basolateral part on heart and motor components of conditioned defensive reaction was studied in chronic experiments on rats. After 10 presentations of the tone during habituation procedure the elaboration of conditioned reaction in operated and control animals was achieved in one session (10 pairings of the tone with electrical pain stimulation in a minute). The analysis of the changes in the heart rate of amygdalectomized rats immediately after the elaboration revealed a shorter time of retention of the heart rate tachycardiac changes elicited by aversive stimulation. In tests one hour and 24 hours after the elaboration, the operated animals showed no conditioned bradycardiac reaction to the tone. This fact suggests a severe impairment of the conditioned emotional reaction of fear. The absence of the emotional component of the conditioned reaction seems to result in the disturbance of reproduction of its motor component.

Amygdala↗
PubMedDate not supplied

[Cardiorhythmograph].

A device containing a digital meter of cardiointervals (with a measuring accuracy of +/- 2 msec) and a digital-to-analog converter (for 10 bits) is proposed. The device ensures the high-quality registration of cardiointervalograms. The parallel binary codes carrying information on the duration of cardiointervals are supplied to the perforator control unit or directly to the computer. To ensure the rational use of the whole width of the recorder tape, the possibility of changing the amplification scale of the output analog signal and the compensation of its noninformative steady component are provided. The circuit of the device includes the counter of the number of analyzed cardiocycles with the output where the logical unit is changed for zero (and vice versa) after every 50 measured intervals. The device is activated either by the built-in integrated-circuit amplifier of biopotentials or by the demodulator of frequency-modulated signals transmitting ECG over the telephone.

Analog-Digital Conversion↗