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Gamma (40-100 Hz) oscillation in the hippocampus of the behaving rat
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The cellular generation and spatial distribution of gamma frequency (40-100 Hz) activity was examined in the hippocampus of the awake rat. Field potentials and unit activity were recorded by multiple site silicon probes (5- and 16-site shanks) and wire electrode arrays. Gamma waves were highly coherent along the long axis of the dentate hilus, but average coherence decreased rapidly in the CA3 and CA1 directions. Analysis of short epochs revealed large fluctuations in coherence values between the dentate and CA1 gamma waves. Current source density analysis revealed large sinks and sources in the dentate gyrus with spatial distribution similar to the dipoles evoked by stimulation of the perforant path. The frequency changes of gamma and theta waves positively correlated (40-100 Hz and 5-10 Hz, respectively). Putative interneurons in the dentate gyrus discharged at gamma frequency and were phase-locked to the ascending part of the gamma waves recorded from the hilus. Following bilateral lesion of the entorhinal cortex the power and frequency of hilar gamma activity significantly decreased or disappeared. Instead, a large amplitude but slower gamma pattern (25-50 Hz) emerged in the CA3-CA1 network. We suggest that gamma oscillation emerges from an interaction between intrinsic oscillatory properties of interneurons and the network properties of the dentate gyrus. We also hypothesize that under physiological conditions the hilar gamma oscillation may be entrained by the entorhinal rhythm and that gamma oscillation in the CA3-CA1 circuitry is suppressed by either the hilar region or the entorhinal cortex.
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“The amplitude envelope of the gamma oscillation was phase-locked to the theta rhythm (Figures 3A,B and 4C), as it is in the biological CA1, representing cross-frequency coupling (Soltesz and Deschênes, 1993; Bragin et al., 1995; Buzsáki et al., 2003; Jensen and Colgin, 2007; Belluscio et al., 2012).”
From Interneuronal mechanisms of hippocampal theta oscillations in a full-scale model of the rodent CA1 circuit (2016) · cites this paper as Bragin et al., 1995
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Metadata
- Authors
- Bragin, A., Jando, G., Nadasdy, Z., Hetke, J., Wise, K., & Buzsaki, G.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- ORCID
- Bragin, A
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 1995-01-01
- Volume
- 15
- Issue
- 1
- Pages
- 47-60
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6578273
- OpenAlex
- W1653233231
- Cited by
- 1,527
- References
- 34
- Citations by year
- 2026: 14 · 2025: 33 · 2024: 28 · 2023: 43 · 2022: 66 · 2021: 51 · 2020: 58 · 2019: 72 · 2018: 63 · 2017: 52 · 2016: 76 · 2015: 57 · 2014: 73 · 2013: 70 · 2012: 71
- FWCI
- 18.49
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- gamma oscillations, hippocampus, dentate gyrus, entorhinal cortex, interneurons, phase locking, current source density, perforant path, theta-gamma coupling, neural coherence
- MeSH terms
- Animals, Behavior, Animal, Electroencephalography, Electrophysiology, Female, Hippocampus, Male, Neurons, Oscillometry, Theta Rhythm, Rats, Sprague-Dawley, Entorhinal Cortex, Rats
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