[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.

[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.

[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.