[Changes in cardiorhythm and its stochastic parameters in first-graders with normal neuropsychological development and in children with speech disorders during performance of intellectual activity].

Influence of positive and negative motivation on the performance efficiency and some stochastic characteristics of RR-interval fluctuations in speech association experiment was studied in two groups of pupils of the first class: normally developing children and children with speech deviations. It was shown that children with normal development achieve their maximal productivity mostly under the influence of their inner motivation without external stimulation, while for achieving the maximal productivity by children with speech deviations the positive external motivation is required. Baseline ECG recordings in two groups of children significantly differed only in the standard error of the RR-intervals that was decreased in the deviant children.

[Peroxide chemiluminescence of the cerebrospinal fluid in spinal cord tumors].

Spontaneous and initiated by hydrogen peroxide chemiluminescence was evaluated before and after freezing of the CSF from 20 patients with various spinal tumors and 10 controls with intervertebral lumbar osteochondrosis. The intensity of the above chemiluminescence was found significantly different in tumors and osteochondrosis. Cryotreatment induced marked changes in CSF chemiluminescence, especially in extramedullary spinal tumors.

[The effect of normal and pathological human functional states on the development of adequate behavior in an experiment].

Behaviours of 40 healthy, 30 neurotic and 35 schizophrenic subjects were compared in the situation of formation of motivation for successful performance of a complicated task. In the case of an easy task, the subjects had to push a button maximally quickly after the second buzz in a double sound stimulus; in the case of the complicated task, after special motivating instruction, the subjects had to show motor response coinciding with the second buzz. The easy task was performed by all participants of the experiment, while the complicated one was performed by healthy subjects and by neurotics after the course of therapy.

[Chemoluminescence of the cerebrospinal fluid in spinal cord tumors].

The article discusses a new method for recognising tumors of the spinal cord--spontaneous and photoinduced chemoluminescence of the cerebrospinal fluid. Twenty-seven patients with tumors of the spinal cord of various localization and histological structure and 15 individuals of the control group were examined. Statistically significant differences in chemoluminescence in extra- and intramedullary tumors and in the control group were revealed.

[Automatic calculation, using a programmed calculator, of basic central hemodynamic parameters determined by impedance plethysmography].

Programmes for the calculation of basic hemodynamic parameters determined by impedance plethysmography, using microcalculator "Electronika MK-61" and its function analogues are presented. Programmed calculations save time and increase the accuracy of calculations especially in large-scale investigations.

[Relation of electrophysiological indices in various degrees of negative disorders in patients with schizophrenia].

Preliminary results of the investigation of "expectation wave" phenomenon in 25 schizophrenic patients aged 17 to 41 years (20 or less years since the onset of the disease) are presented. The control group consisted of 10 healthy persons. The characters of evoked responses in patients and normals were essentially different.

[Chemiluminescence of erythrocytes of various age groups in patients with diabetes mellitus].

Hydrogen peroxide-induced chemiluminescence of red cells of various age groups in diabetics was under study. A clinical, laboratory, and instrumental examination of 15 patients with diabetes mellitus was carried out. Red cell fraction chemiluminescence was examined in quantum metric equipment with FEU-39A and FEU-140 radiation detectors sensitive to the visible and UV regions.

[Characteristics of slow electrical potentials in healthy subjects and in patients with various forms of neuroses].

The shapes of the slow brain potentials--conditioned negative wave (CNW) and postimperative negative wave (PNW)--were compared in normal and neurotic subjects. Instruction-directed performance was used to investigate the physiological mechanisms of neuroses and to develop the diagnostic psychophysiologic tests with simultaneous recording of the slow potentials. These were evaluated by calculation of asymmetry and power amplification coefficients for CNW and PNW while more and more complicated instructions were given.

[Effect of amygdalectomy on evoked potentials of the cat sensomotor cortex].

It has been shown that EPs in the sensorimotor cortex of amygdalectomized cats appear in response to almost all burst of tone frequencies ranging from 0.2 to 10.0 khz.