Evidence map›Paper›PMID 27748240›Full record

ArticleSleep2016

Different Simultaneous Sleep States in the Hippocampus and Neocortex.

Joshua J Emrick, Brooks A Gross, Brett T Riley, Gina R Poe

Abstract read
In one paragraph

Article in Sleep, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers.

0numbers the graph read from it
0cells of the map it votes in
24citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

24 citing papers in PubMed.

  1. Article
  2. Article
  3. Review
  4. Article
  5. CB-1 receptor agonist drastically changes oscillatory activity, defining active sleep.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Review
  13. Article
  14. Regional variability in intracerebral properties of NREM to REM sleep transitions in humans.Proceedings of the National Academy of Sciences of the United States of America · 2023
    Article
  15. Recurrent Hippocampo-neocortical sleep-state divergence in humans.Proceedings of the National Academy of Sciences of the United States of America · 2022
    Article
  16. The why and how of sleep-dependent synaptic down-selection.Seminars in cell & developmental biology · 2022
    Article
  17. Article
  18. What Is REM Sleep?Current biology : CB · 2020
    Review
  19. Oscillating circuitries in the sleeping brain.Nature reviews. Neuroscience · 2019
    Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Joshua J EmrickUniversity of California, San Francisco, CA.
Brooks A GrossUniversity of California, Los Angeles, CA.
Brett T RileyColumbia Basin College, Pasco, WA.
Gina R PoeUniversity of California, Los Angeles, CA.

Funding

REM SLEEP AND MEMORYR01MH060670 · NIMH · WASHINGTON STATE UNIVERSITY · PI POE, GINA R · 2000 to 2023
$6.4M
NIMH NIH HHS R01 MH060670
6 · The paper itself

Abstract

STUDY

objectivesInvestigators assign sleep-waking states using brain activity collected from a single site, with the assumption that states occur at the same time throughout the brain. We sought to determine if sleep-waking states differ between two separate structures: the hippocampus and neocortex.

methodsWe measured electrical signals (electroencephalograms and electromyograms) during sleep from the hippocampus and neocortex of five freely behaving adult male rats. We assigned sleep-waking states in 10-sec epochs based on standard scoring criteria across a 4-h recording, then analyzed and compared states and signals from simultaneous epochs between sites.

resultsWe found that the total amount of each state, assigned independently using the hippocampal and neocortical signals, was similar between the hippocampus and neocortex. However, states at simultaneous epochs were different as often as they were the same (P = 0.82). Furthermore, we found that the progression of states often flowed through asynchronous state-pairs led by the hippocampus. For example, the hippocampus progressed from transition-to-rapid eye movement sleep to rapid eye movement sleep before the neocortex more often than in synchrony with the neocortex (38.7 ± 16.2% versus 15.8 ± 5.6% mean ± standard error of the mean).

conclusionsWe demonstrate that hippocampal and neocortical sleep-waking states often differ in the same epoch. Consequently, electrode location affects estimates of sleep architecture, state transition timing, and perhaps even percentage of time in sleep states. Therefore, under normal conditions, models assuming brain state homogeneity should not be applied to the sleeping or waking brain.

Indexed as

AnimalsElectroencephalographyHippocampusMaleNeocortexRatsSleep, REMSleep StagesWakefulnessdissociated statesEEGhippocampushomeostasislocal sleepneocortexREMsleepslow wave sleeptransition-to-REM

Identifiers

PMID27748240
PMCPMC5103808

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.