An acetylcholine-activated microcircuit drives temporal dynamics of cortical activity
Open accessAbstract
Cholinergic modulation of cortex powerfully influences information processing and brain states, causing robust desynchronization of local field potentials and strong decorrelation of responses between neurons. We found that intracortical cholinergic inputs to mouse visual cortex specifically and differentially drive a defined cortical microcircuit: they facilitate somatostatin-expressing (SOM) inhibitory neurons that in turn inhibit parvalbumin-expressing inhibitory neurons and pyramidal neurons. Selective optogenetic inhibition of SOM responses blocked desynchronization and decorrelation, demonstrating that direct cholinergic activation of SOM neurons is necessary for this phenomenon. Optogenetic inhibition of vasoactive intestinal peptide-expressing neurons did not block desynchronization, despite these neurons being activated at high levels of cholinergic drive. Direct optogenetic SOM activation, independent of cholinergic modulation, was sufficient to induce desynchronization. Together, these findings demonstrate a mechanistic basis for temporal structure in cortical populations and the crucial role of neuromodulatory drive in specific inhibitory-excitatory circuits in actively shaping the dynamics of neuronal activity.
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Neuromodulatory inputs, such as acetylcholine, alter the correlation statistics of synaptic activity in the cortex.
“Neuromodulatory inputs, such as acetylcholine (ACh), also alter the correlation statistics of synaptic activity in the cortex73,75.”
From Mechanisms underlying gain modulation in the cortex (2020) · cites this paper as [75]
Cholinergic input to cortex increases SST+ interneuron activity, thus increasing inhibition of PV+ cells and pyramidal neurons and desynchronizing cortical networks and synaptic inputs to individual neurons.
“Cholinergic input to the cortex increases SST+ interneuron activity, thus increasing inhibition of PV+ cells and pyramidal neurons and desynchronizing cortical networks75 and synaptic inputs to individual neurons.”
From Mechanisms underlying gain modulation in the cortex (2020) · cites this paper as [75]
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- Authors
- Chen, N., Sugihara, H., & Sur, M.
- Affiliations
- Massachusetts Institute of Technology (US)
- Corresponding author
- Sur, Mriganka
- Venue
- Nature Neuroscience
- Published
- 2015-04-27
- Volume
- 18
- Issue
- 6
- Pages
- 892-902
- ISSN
- 1097-6256 (ISSN-L)
- 1546-1726
- PMC
- PMC4446146
- OpenAlex
- W1980563724
- Cited by
- 210
- References
- 67
- Citations by year
- 2026: 14 · 2025: 16 · 2024: 23 · 2023: 15 · 2022: 21 · 2021: 15 · 2020: 17 · 2019: 22 · 2018: 21 · 2017: 23 · 2016: 20 · 2015: 3
- FWCI
- 13.42
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Nature Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
- PMC
- Funders
- National Eye Institute (R01EY018648, R01EY007023)
- National Institute of Neurological Disorders and Stroke (U01NS090473)
- 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 › Visual perception and processing mechanisms
- Keywords
- acetylcholine, cholinergic modulation, somatostatin interneurons, parvalbumin interneurons, cortical microcircuits, neuromodulation, vasoactive intestinal peptide neurons, optogenetic inhibition, mouse visual cortex
- MeSH terms
- Acetylcholine, Animals, Cerebral Cortex, Cortical Synchronization, Interneurons, Mice, Inbred C57BL, Nerve Net, Neurons, Parasympathetic Nervous System, Parvalbumins, Photic Stimulation, Somatostatin, Vasoactive Intestinal Peptide, Visual Pathways, Pyramidal Cells, Excitatory Postsynaptic Potentials, Mice, Optogenetics
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