Hierarchical nesting of slow oscillations, spindles and ripples in the human hippocampus during sleep

Bernhard P Staresina, Til Ole Bergmann, Mathilde Bonnefond, Roemer van der Meij, Ole Jensen, Lorena Deuker, Christian E Elger, Nikolai Axmacher, Juergen Fell

Research output: Contribution to journalArticlepeer-review

276 Citations (Scopus)


During systems-level consolidation, mnemonic representations initially reliant on the hippocampus are thought to migrate to neocortical sites for more permanent storage, with an eminent role of sleep for facilitating this information transfer. Mechanistically, consolidation processes have been hypothesized to rely on systematic interactions between the three cardinal neuronal oscillations characterizing non-rapid eye movement (NREM) sleep. Under global control of de- and hyperpolarizing slow oscillations (SOs), sleep spindles may cluster hippocampal ripples for a precisely timed transfer of local information to the neocortex. We used direct intracranial electroencephalogram recordings from human epilepsy patients during natural sleep to test the assumption that SOs, spindles and ripples are functionally coupled in the hippocampus. Employing cross-frequency phase-amplitude coupling analyses, we found that spindles were modulated by the up-state of SOs. Notably, spindles were found to in turn cluster ripples in their troughs, providing fine-tuned temporal frames for the hypothesized transfer of hippocampal memory traces.

Original languageEnglish
Pages (from-to)1679-1686
Number of pages8
JournalNature Neuroscience
Issue number11
Publication statusPublished - 21 Nov 2015


  • Consolidation
  • Psychology


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