Accepted in revised form 20 December 2001; received 10 October 2001.
Under conditions of polygraphic recording of the parameters of the sleep-wakefulness cycle (SWC) deprivation of paradoxical sleep (PSD) was made in cats by means of nonemotional awakening, in one case after the transition of deep slow-wave sleep (DSWS) to paradoxical sleep (PS) and appearance of rapid eye movements (REMs) (REM-deprivation), while in the other - after appearance of single ponto-geniculo-occipital (PGO) spikes during DSWS (PGO-deprivation). At REM-deprivation the accumulation of specific inner need for PS appeared to occur more intensively than at PGO-deprivation. This is expressed, first, in the PS onset being more frequent at REM-deprivation than at PGO-deprivation, and secondly, there is far greater rebound of the deprived phase in the postdeprivation SWC with the first version of deprivation than with the other. The both facts are explained by that that at PGO-deprivation, in contrast from the REM-deprivation, PS deprivation is paralleled also by a partial DSWS deprivation.
Key Words: The sleep-wakefulness cycle, deep slow-wave sleep, paradoxical sleep, PGO-deprivation, REM-deprivation.
Correspondence: Maisuradze Lia,
Department of Neurobiology of Sleep-Wakefulness Cycle,
I.S. Beritashvili Institute of Physiology, Georgian Academy of Sciences,
14, L. Gotua str., Tbilisi, 380060, Georgia.
E-mail: nswc@neurobiology.ge