The effects of various parameters of electric footshock on the sleep stage distribution of hooded rats were investigated in three experiments. Shock severity, rather than predictability or controllability, affected sleep stage distribution. Continued suppression of REM sleep occurred with the administration of 150, but not with the administration of 15 shocks per day. The predictability of shock onset and the controllability of shock offset, had no effect whatsoever on sleep stage distribution. S. Afr. J. Psychol. 1984, 14: 124-130 Die effek van spanning op die slaappatroon van laboratoriurnrotte is in drie eksperimente ondersoek deur middel van verskillende soorte elektriese skok, Die intensiteit, eerder as die voorspelbaarheid of kontrole oor die skok, het die verspreiding van slaapstadiums be'invloed. Onderdrukking van REM-slaap het met die toediening van 150 skokke per dag gepaard gegaan, maar nie met die toediening van 15 skokke per dag nie. Die voorspelbaarheid van die aanvang en kontrole oor die beeindiging van die skok, het geen effek op die verspreiding van die verskillende stadiums van slaap gehad nie.
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