Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center (CRNL), INSERM, CNRS, Lyon F-69500, France.
Cereb Cortex. 2014 May;24(5):1206-15. doi: 10.1093/cercor/bhs388. Epub 2013 Jan 2.
The neurophysiological correlates of dreaming remain unclear. According to the "arousal-retrieval" model, dream encoding depends on intrasleep wakefulness. Consistent with this model, subjects with high and low dream recall frequency (DRF) report differences in intrasleep awakenings. This suggests a possible neurophysiological trait difference between the 2 groups. To test this hypothesis, we compared the brain reactivity (evoked potentials) of subjects with high (HR, N = 18) and low (LR, N = 18) DRF during wakefulness and sleep. During data acquisition, the subjects were presented with sounds to be ignored (first names randomly presented among pure tones) while they were watching a silent movie or sleeping. Brain responses to first names dramatically differed between the 2 groups during both sleep and wakefulness. During wakefulness, the attention-orienting brain response (P3a) and a late parietal response were larger in HR than in LR. During sleep, we also observed between-group differences at the latency of the P3a during N2 and at later latencies during all sleep stages. Our results demonstrate differences in the brain reactivity of HR and LR during both sleep and wakefulness. These results suggest that the ability to recall dreaming is associated with a particular cerebral functional organization, regardless of the state of vigilance.
做梦的神经生理学相关性仍不清楚。根据“唤醒-检索”模型，梦境的编码取决于睡眠中的觉醒。与该模型一致的是，高梦回忆频率（DRF）和低梦回忆频率（DRF）的受试者报告在睡眠中觉醒时有差异。这表明这两组受试者之间可能存在神经生理学特征差异。为了验证这一假设，我们比较了高（HR，N=18）和低（LR，N=18）DRF 受试者在清醒和睡眠期间的大脑反应（诱发电位）。在数据采集过程中，受试者观看无声电影或睡眠时，会忽略呈现的声音（随机呈现纯音中的名字）。在清醒和睡眠期间，两组受试者对名字的大脑反应差异很大。在清醒状态下，HR 的注意力导向大脑反应（P3a）和后期顶叶反应大于 LR。在睡眠期间，我们还观察到 N2 期间 P3a 的潜伏期和所有睡眠阶段的后期潜伏期，两组之间存在差异。我们的结果表明，HR 和 LR 在清醒和睡眠期间的大脑反应存在差异。这些结果表明，回忆做梦的能力与特定的大脑功能组织有关，而与警觉状态无关。
