Hippocampal sharp waves: Their origin and significance
Abstract
This study investigated the spatial distribution and cellular-synaptic generation of hippocampal sharp waves (SPW) in the dorsal hippocampus of the awake rat. Depth analyses of SPWs were performed by stepping the recording electrode in 82.5 microns increments. SPWs were present during slow wave sleep, awake immobility, drinking, grooming and eating (0.01-2/s). The largest negative SPWs were recorded from the middle part of the stratum radiatum of CA1, the stratum lucidum of CA3, the inner molecular layer of the dentate gyrus and from layer I of the subiculum, in that order. The polarity of the SPWs was positive in layers II-IV of the subiculum, in stratum oriens and stratum pyramidale of CA1 and CA3, and in the hilus of the dentate gyrus. The electrical gradients across the null zones of the field SPWs were as large as 8-14 mV/mm. SPWs were associated with population bursts of pyramidal cells and increased discharges of interneurons and granule cells. During the SPW the excitability of granule cells and pyramidal cells to afferent volleys increased considerably. Picrotoxin and atropine and aspiration lesion of the fimbria-fornix increased either the amplitude or the frequency of SPWs. Diazepam and Nembutal could completely abolish SPWs. It is suggested that: hippocampal SPWs are triggered by a population burst of CA3 pyramidal cells as a result of temporary disinhibition from afferent control; and field SPWs represent summed extracellular PSPs of CA1 and subicular pyramidal c…
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Wake reactivations occur conjointly with SW-Rs that are observed at somewhat lower rates during wakefulness than during SWS.
“They also occur conjointly with SW-Rs that are observed at somewhat lower rates during wakefulness than during SWS (159,191,870).”
From About Sleep's Role in Memory (2013) · cites this paper as [159]
SW-Rs may conversely promote LTP and spike time-dependent plasticity in hippocampal circuits.
“SW-Rs may conversely promote LTP and spike timedependent plasticity in hippocampal circuits (97,159,241,640,777).”
From About Sleep's Role in Memory (2013) · cites this paper as [159]
SW-Rs occur mainly during SWS but also during nonexploratory wakefulness.
“SW-Rs occur mainly during SWS but also during nonexploratory wakefulness (e.g., drinking, grooming, and quiet wakefulness).”
From About Sleep's Role in Memory (2013) · cites this paper as [159]
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- Authors
- Buzsáki, G.
- Affiliations
- University of Pecs (HU)
- Corresponding author
- Buzsáki, György
- ORCID
- Buzsáki, György
- Venue
- Brain Research
- Publisher
- Elsevier BV
- Published
- 1986-11
- Volume
- 398
- Issue
- 2
- Pages
- 242-252
- ISSN
- 0006-8993 (ISSN-L)
- OpenAlex
- W2041800086
- Cited by
- 925
- References
- 0
- Citations by year
- 2026: 13 · 2025: 38 · 2024: 44 · 2023: 43 · 2022: 26 · 2021: 31 · 2020: 33 · 2019: 38 · 2018: 34 · 2017: 29 · 2016: 27 · 2015: 33 · 2014: 46 · 2013: 42 · 2012: 35
- FWCI
- 6.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- dorsal hippocampus, CA3 pyramidal cells, CA1 pyramidal neurons, dentate gyrus granule cells, subiculum, slow-wave sleep, disinhibition, fimbria-fornix, picrotoxin, diazepam, pentobarbital, long-term potentiation, Schaffer collaterals, extracellular potentials
- MeSH terms
- Animals, Atropine, Behavior, Animal, Diazepam, Electrophysiology, Hippocampus, Male, Neural Pathways, Synaptic Transmission, Picrotoxin, Sleep Stages, Synapses, Rats
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