Ferrara M, De Gennaro L, Casagrande M, Bertini M
Department of Psychology, University of Rome La Sapienza, Italy.
Psychophysiology. 2000 Jul;37(4):440-6.
We evaluated the effects of selective slow-wave sleep (SWS) deprivation and time-of-night factors on cognitive performance upon awakening. Ten normal men slept for 6 consecutive nights in the laboratory: 1 adaptation, 2 baseline, 2 selective SWS deprivation, and 1 recovery night. Cognitive performance was assessed by means of a Descending Subtraction Task after 2, 5, and 7.5 h of sleep. There was an almost complete selective SWS suppression during both deprivation nights, and a significant SWS rebound during the recovery sleep. Regarding cognitive performance, a progressive linear decrease of sleep inertia upon successive awakenings was found during all experimental nights except for the recovery night. In addition, a significant decrease of sleep inertia was observed upon the morning awakening of the second deprivation night for the measure of performance speed, and a significant increase of sleep inertia upon the morning awakening of the recovery night for the measure of performance accuracy. The results show that cognitive performance upon awakening is adversely affected by sleep depth and that, during the sleep-wake transition, cognitive performance accuracy is more impaired than performance speed.
我们评估了选择性慢波睡眠（SWS）剥夺和夜间时间因素对觉醒时认知表现的影响。10名正常男性在实验室连续睡6晚：1晚适应期，2晚基线期，2晚选择性SWS剥夺期，以及1晚恢复期。在睡眠2、5和7.5小时后，通过递减减法任务评估认知表现。在两个剥夺期夜晚，几乎完全抑制了SWS，在恢复睡眠期间出现了显著的SWS反弹。关于认知表现，在除恢复期夜晚之外的所有实验夜晚，连续觉醒时睡眠惰性呈渐进性线性下降。此外，在第二个剥夺期夜晚早晨觉醒时，表现速度指标的睡眠惰性显著下降，而在恢复期夜晚早晨觉醒时，表现准确性指标的睡眠惰性显著增加。结果表明，觉醒时的认知表现受到睡眠深度的不利影响，并且在睡眠 - 觉醒转换期间，认知表现准确性比表现速度受损更严重。
