[Evoked electrical activity. The methodological problems and outlook].

Basic methodological problems of recording the evoked electrical activity (EEA) are analysed in terms of its genesis. Further progress with non-invasive methods seems to be limited. The proposed technique provides an a priori "space-time" information due to measurement of several classes of the EEA and simultaneous stimulation of two subsystems of the CNS.

[The evaluation of the effect of variable latency periods on the averaged evoked potential].

The data on averaged EPs were used for simulation of stationary responses to sensory stimuli. The EP variability was observed when the range of the latency shift exceeded 90 msec. The N1, P2 and N2 components of the averaged long-latency auditory EPs were chosen for estimation of the latent variation range in normal subjects using encephaloscopy (RES) technique.

[Comparative study of the laws governing cutaneous blood flow in the thermoneutral zone].

A simplified model of the rabbit thermoregulatory system in the thermoneutral zone revealed three principles of the skin blood flow control. The temperature fluctuations in the thermoneutral zone could only be obtained in case of the on-off response of the control.

[Certain quantitative patterns in the control of cutaneous blood flow during thermoregulatory reactions].

The total blood flow of rabbit's ear was inversely proportional to ambient temperature when the hypothalamic temperature was by 1 +/- 1.5 degrees C higher than normal due to ambient temperature raise from 15 degrees to 35 degrees C. The data obtained corroborate the viewpoint that the blood flow regulation not only controls heat loss by the rabbit ear, but also stabilizes the temperature of venous blood flow in the ear, when the ambient temperature varies in wide range.

[Several statistical patterns in the control of vascular thermoregulatory reactions].

In intact rabbits, in near to natural conditions with ambient temperature changing from 15 to 40 degrees C, switching on (off) of the thermoregulatory vascular response in the ear occurs at the moments when the suspended temperature of the hypothalamus, the temperature of the back skin, and speed of changes in the skin temperature attain (drop to) some extreme value. Quantitative estimates of the weight for this summation, were obtained.

[Use of a mathematical model to assess cutaneous blood flow and heat loss during a thermoregulatory reaction].

The general blood flow and heat loss were determined in the rabbit ear with the aid of a mathematical model and on the basis of measurements of ambient, hypothalamic, and the ear temperatures, while the ambient temperature changed from--10 degrees C to + 40 degrees C. A static dependence of ear's heat loss on the blood flow intensity at different ambient temperatures, was quantitatively determined.