Blagrove Mark, Blakemore Sarah-Jayne, Thayer Ben R J
Department of Psychology, University of Wales Swansea, SA2 8PP, UK.
Conscious Cogn. 2006 Jun;15(2):285-94. doi: 10.1016/j.concog.2005.06.007. Epub 2005 Sep 12.
Self-produced tactile stimulation usually feels less tickly--is perceptually attenuated--relative to the same stimulation produced externally. This is not true, however, for individuals with schizophrenia. Here, we investigate whether the lack of attenuation to self-produced stimuli seen in schizophrenia also occurs for normal participants following REM dreams. Fourteen participants were stimulated on their left palm with a tactile stimulation device which allowed the same stimulus to be generated by the participant or by the experimenter. The level of self-tickling attenuation did not differ between REM and non-REM sleep awakening conditions, where presence or absence of an accompanying dream was not controlled for. However, for the female participants, when awakening occurred from an REM sleep dream, self-stimulation ratings were higher than for external stimulation, whereas ratings after NREM sleep unaccompanied by a dream were lower for self-stimulation than for external stimulation. These results indicate deficits in self-monitoring and a confusion between self- and externally generated stimulation accompany REM dream formation.
与外部产生的相同刺激相比，自我产生的触觉刺激通常感觉不那么痒——在感知上有所减弱。然而，对于精神分裂症患者来说并非如此。在这里，我们研究了精神分裂症患者中出现的对自我产生的刺激缺乏减弱现象，在快速眼动（REM）梦境后的正常参与者中是否也会出现。14名参与者的左手掌被一个触觉刺激装置刺激，该装置允许参与者或实验者产生相同的刺激。在快速眼动睡眠和非快速眼动睡眠觉醒条件下，自我挠痒减弱的程度没有差异，且未对是否伴有梦境进行控制。然而，对于女性参与者来说，当从快速眼动睡眠梦境中醒来时，自我刺激评分高于外部刺激评分，而在无梦境的非快速眼动睡眠后，自我刺激评分低于外部刺激评分。这些结果表明，在快速眼动梦境形成过程中，存在自我监测缺陷以及自我产生的刺激和外部产生的刺激之间的混淆。
