[THE EFFECT OF MOTION SICKNESS ON THE SLEEP-WAKE CYCLE IN RATS EXPOSED TO PRENATAL HYPOXIA].

This study is a continuation of our research of phenomenology and mechanisms of motion sickness (MS) and the relation of this phenomenon to features of sleep-wake cycle (SWC) changes. It presents data about the effect of MS on SWC in 30-day-old intact rats and rats exposed previously to prenatal hypoxia on days 13 and 19 of gestation. In all groups of animals MS was shown to reduce significantly the waking time and to increase the time of paradoxical sleep (PS).

[BEHAVIORAL AND FUNCTIONAL VESTIBULAR DISTURBANCES AFTER SPACE FLIGHT. 2. FISHES, AMPHIBIANS AND BIRDS].

The review contains data on functional shifts in fishes, amphibians and birds caused by changes in the otolith system operation after stay under weightlessness conditions. These data are of theoretical and practical significance and are important to resolve some fundamental problems of vestibulogy. The analysis of the results of space experiments has shown that weightlessness conditions do not exert a substantial impact on formation and functional state of the otolith system in embryonic fishes, amphibians and birds developed during space flight.

[BEHAVIOURAL AND FUNCTIONAL VESTIBULAR DISTURBANCES AFTER SPACE FLIGHT. 1. MAMMALS].

The review contains data on functional changes in mammals caused by changes in the operation of vestibular system after space flight. These data show that the vestibular system of mammals responds to weightlessness challenge differently at various ontogenetic stages. Orbital space flight conditions have a weak effect on the developing vestibular system during embryonic period.

[Lateralization of behavioral reactions and otolith asymmetry].

Lateralized behavior is widely spread among vertebrate animals and is determined first of ally by structural-functional brain asymmetry as well as by the presence of somatic and visceral asymmetry. Some kinds of asymmetric reactions are suggested to be due to the presence of asymmetry at the level of sense organs, in particular, of otolith organs. This review presents data on value and character of otolith asymmetry (OA) in animals of various species and classes, on action upon it of weightlessness and hypergravity; the problem of effect of OA on vestibular and auditory functions is considered.

[Motion sickness in lower vertebrates: studies under conditions of weightlessness and under land conditions].

The review presents literature data and results of the author's studies with the goal to find out whether lower animals are susceptible to motion sickness. In our studies, fish and amphibians were tested for 2 h and more by using a rotating device (f = 0.24Nz, a(centrifugal) = 0.