Cited by 148Neural dynamics and brain functionNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

The microcircuit concept applied to cortical evolution: from three-layer to six-layer cortex

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Shepherd, Gordon M.·2011·Frontiers in Neuroanatomy

Abstract

Understanding the principles of organization of the cerebral cortex requires insight into its evolutionary history. This has traditionally been the province of anatomists, but evidence regarding the microcircuit organization of different cortical areas is providing new approaches to this problem. Here we use the microcircuit concept to focus first on the principles of microcircuit organization of three-layer cortex in the olfactory cortex, hippocampus, and turtle general cortex, and compare it with six-layer neocortex. From this perspective it is possible to identify basic circuit elements for recurrent excitation and lateral inhibition that are common across all the cortical regions. Special properties of the apical dendrites of pyramidal cells are reviewed that reflect the specific adaptations that characterize the functional operations in the different regions. These principles of microcircuit function provide a new approach to understanding the expanded functional capabilities elaborated by the evolution of the neocortex.

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  • The nonlinear and dynamical properties of cortical pyramidal neurons, especially their multiple dendritic zones targeted by different kinds of projections, may allow the pyramidal neuron to make comparisons of top-down and bottom-up inputs.

    “For example, the nonlinear and dynamical properties of cortical pyramidal neurons—the principal excitatory neuron type in cortex (Shepherd, 2014)—are of particular interest here, especially because these neurons have multiple dendritic zones that are targeted by different kinds of projections, which may allow the pyramidal neuron to make comparisons of top-down and bottom-up inputs23.”

    From Toward an integration of deep learning and neuroscience (2016) · cites this paper as Shepherd, 2014

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Research works printed but not linked: 8

  1. Andersen P. (1960). Interhippocampal impulses. II. Apical dendritic activation of CAI neurons. Acta Physiol. Scand. 48, 178– 208 10.1111/j.1748-1716.1960.tb01856.x 13793336 · DOI
  2. Rall W. Segev I. (1987). “Functional possibilities for synapses on dendrites and on dendritic spines,” in Synaptic Function, eds Edelman G. M. Gall W. Cowan W. M. (New York: John Wiley and Sojs), 605– 636
  3. Rumelhart D. E. McClelland J. L. (eds). (1986). Parallel Distributed Processsing. Explorations in the Microstructure of Cognition. Cambridge, MA: MIT Press 25087578
  4. Shepherd G. M. (1994). Neurobiology, 3rd Edn. New York: Oxford University Press
  5. Shepherd G. M. Grillner S. (eds). (2010). Handbook of Brain Microcircuits. New York: Oxford University Press
  6. Svoboda K. Hooks B. M. Shepherd G. M. G. (2010). “Barrel cortex,” in Handbook of Brain Microcircuits, eds Shepherd G. M. Grillner S. (New York: Oxford University Press), 31– 38
  7. Wang X.-J. (2010). “Prefrontal cortex,” in Handbook of Brain Microcircuits, eds Shepherd G. M. Grillner S. (New York: Oxford University Press), 46– 56
  8. Wilson D. A. Barkai E. (2010). “Olfactory cortex,” in Handbook of Brain Microcircuits, eds Shepherd G. M. Grillner S. (New York: Oxford University Press), 263– 276

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Authors
Shepherd, G. M.
Affiliations
Yale University (US)
Corresponding author
Shepherd, Gordon M.
Venue
Frontiers in Neuroanatomy
Published
2011
Volume
5
Pages
30-30
ISSN
1662-5129 (ISSN-L)
OpenAlex
W2015770802
Cited by
148
References
100
Citations by year
2026: 5 · 2025: 4 · 2024: 6 · 2023: 20 · 2022: 4 · 2021: 10 · 2020: 37 · 2019: 7 · 2018: 6 · 2017: 12 · 2016: 10 · 2015: 14 · 2014: 6 · 2013: 3 · 2012: 4
FWCI
2.11
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Neuroanatomy (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
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 › Memory and Neural Mechanisms
Keywords
cortical evolution, neocortex, olfactory cortex, hippocampus, recurrent excitation, lateral inhibition, apical dendrites, pyramidal neurons, circuit elements

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