Cerebral Cortex Advance Access originally published online on October 1, 2008
Cerebral Cortex 2009 19(5):1158-1166; doi:10.1093/cercor/bhn155
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REM Sleep, Prefrontal Theta, and the Consolidation of Human Emotional Memory
1 Sleep and Neuroimaging Laboratory Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94702, USA, 2 Section of Psychiatry and Behavioral Science, Tokyo Medical and Dental University Graduate School, 1-5-45 Yushima, Bunkyo, Tokyo, Japan, 3 Department of Psychology, Center for Brain Science, Howard Hughes Medical Institute, Harvard University, Davis, CA 95618, USA, 4 Departments of Psychiatry and Radiology, Anthinoula A. Martinos Center, Massachusetts General Hospital, Boston, MA 02114, USA
Address correspondence to Matthew P. Walker, PhD, Department of Psychology, Tolman Hall 3331, University of California, Berkeley, CA 94720-1650, USA. Email: mpwalker{at}berkeley.edu.
Both emotion and sleep are independently known to modulate declarative memory. Memory can be facilitated by emotion, leading to enhanced consolidation across increasing time delays. Sleep also facilitates offline memory processing, resulting in superior recall the next day. Here we explore whether rapid eye movement (REM) sleep, and aspects of its unique neurophysiology, underlie these convergent influences on memory. Using a nap paradigm, we measured the consolidation of neutral and negative emotional memories, and the association with REM-sleep electrophysiology. Subjects that napped showed a consolidation benefit for emotional but not neutral memories. The No-Nap control group showed no evidence of a consolidation benefit for either memory type. Within the Nap group, the extent of emotional memory facilitation was significantly correlated with the amount of REM sleep and also with right-dominant prefrontal theta power during REM. Together, these data support the role of REM-sleep neurobiology in the consolidation of emotional human memories, findings that have direct translational implications for affective psychiatric and mood disorders.
Key Words: consolidation emotion memory REM prefrontal theta
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