Neural Correlates of High-Gamma Oscillations (60–200 Hz) in Macaque Local Field Potentials and Their Potential Implications in Electrocorticography
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Recent studies using electrocorticographic (ECoG) recordings in humans have shown that functional activation of cortex is associated with an increase in power in the high-gamma frequency range (∼60–200 Hz). Here we investigate the neural correlates of this high-gamma activity in local field potential (LFP). Single units and LFP were recorded with microelectrodes from the hand region of macaque secondary somatosensory cortex while vibrotactile stimuli of varying intensities were presented to the hand. We found that high-gamma power in the LFP was strongly correlated with the average firing rate recorded by the microelectrodes, both temporally and on a trial-by-trial basis. In comparison, the correlation between firing rate and low-gamma power (40–80 Hz) was much smaller. To explore the potential effects of neuronal firing on ECoG, we developed a model to estimate ECoG power generated by different firing patterns of the underlying cortical population and studied how ECoG power varies with changes in firing rate versus the degree of synchronous firing between neurons in the population. Both an increase in firing rate and neuronal synchrony increased high-gamma power in the simulated ECoG data. However, ECoG high-gamma activity was much more sensitive to increases in neuronal synchrony than firing rate.
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The high-γ band of the local field potential (70-150 Hz) correlates with neuronal firing rates underneath each ECoG electrode and captures cortical representations of acoustic and articulatory features relevant to speech.
“The high-γ band of the local field potential (70–150 Hz) correlates with neuronal firing rates underneath each ECoG electrode86,87 and captures cortical representations of acoustic and articulatory features relevant to speech17,88,89 (Fig. 1; Crone et al. 1998, 2001).”
From The speech neuroprosthesis (2024) · cites this paper as [87]
The Discussion reports that LFP high-gamma power is tightly correlated with firing rate near a microelectrode. It distinguishes this measured result from its ECoG model, in which high-gamma power is more sensitive to firing synchrony than to firing rate; it does not establish the claimed correlation underneath each ECoG electrode. The speech-feature clause has separate citations and is not attributed to this source. (LLM, conf=0.87)
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- Authors
- Ray, S., Crone, N. E., Niebur, E., Franaszczuk, P. J., & Hsiao, S. S.
- Affiliations
- Howard Hughes Medical Institute (US)
- Harvard University (US)
- Johns Hopkins University (US)
- Corresponding author
- Ray, Supratim
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2008-11-05
- Volume
- 28
- Issue
- 45
- Pages
- 11526-11536
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC2715840
- OpenAlex
- W2114291169
- Cited by
- 722
- References
- 62
- Citations by year
- 2026: 42 · 2025: 69 · 2024: 49 · 2023: 51 · 2022: 39 · 2021: 63 · 2020: 53 · 2019: 64 · 2018: 36 · 2017: 42 · 2016: 35 · 2015: 32 · 2014: 31 · 2013: 28 · 2012: 21
- FWCI
- 11.22
- 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)
- Funders
- National Institutes of Health (5r01ey016281-08)
- National Eye Institute (R01-EY016281, 5R01-EY-016281-02)
- National Institute of Neurological Disorders and Stroke (R01NS034086, R01NS018787, NS-4318801A1, R01NS043188, R01NS040596)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
- Keywords
- high-gamma oscillations, local field potentials, electrocorticography, neuronal firing rate, neuronal synchronization, secondary somatosensory cortex, vibrotactile stimuli, macaque cortex, low gamma oscillations
- MeSH terms
- Action Potentials, Animals, Behavior, Animal, Brain Mapping, Electric Stimulation, Electroencephalography, Evoked Potentials, Female, Macaca mulatta, Male, Models, Biological, Neurons, Physical Stimulation, Psychophysics, Somatosensory Cortex, Spectrum Analysis, Touch, Nonlinear Dynamics
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