[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.