Cited by 84Visual perception and processing mechanismsNeuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanisms

Segregation of feedforward and feedback projections in mouse visual cortex

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Berezovskii, Vladimir K., Nassi, Jonathan J., Born, Richard T.·2011·Journal of Comparative Neurology

Abstract

Hierarchical organization is a common feature of mammalian neocortex. Neurons that send their axons from lower to higher areas of the hierarchy are referred to as “feedforward” (FF) neurons, whereas those projecting in the opposite direction are called “feedback” (FB) neurons. Anatomical, functional, and theoretical studies suggest that these different classes of projections play fundamentally different roles in perception. In primates, laminar differences in projection patterns often distinguish the two projection streams. In rodents, however, these differences are less clear, despite an established hierarchy of visual areas. Thus the rodent provides a strong test of the hypothesis that FF and FB neurons form distinct populations. We tested this hypothesis by injecting retrograde tracers into two different hierarchical levels of mouse visual cortex (area 17 and anterolateral area [AL]) and then determining the relative proportions of double‐labeled FF and FB neurons in an area intermediate to them (lateromedial area [LM]). Despite finding singly labeled neurons densely intermingled with no laminar segregation, we found few double‐labeled neurons (≈5% of each singly labeled population). We also examined the development of FF and FB connections. FF connections were present at the earliest timepoint we examined (postnatal day 2, P2), while FB connections were not detectable until P11. Our findings indicate that, even in cortices without laminar segregation of FF and FB neurons, the two projection systems are largely distinct at the neuronal level and also differ with respect to the timing of their axonal outgrowth. J. Comp. Neurol. 519:3672–3683, 2011. © 2011 Wiley‐Liss, Inc.

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Authors
Berezovskii, V. K., Nassi, J. J., & Born, R. T.
Affiliations
Harvard University (US)
Corresponding author
Born, Richard T.
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
2011-10-17
Volume
519
Issue
18
Pages
3672-3683
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W2150908684
Cited by
84
References
59
Citations by year
2026: 3 · 2025: 7 · 2024: 7 · 2023: 7 · 2022: 7 · 2021: 7 · 2020: 5 · 2019: 7 · 2018: 5 · 2017: 5 · 2016: 8 · 2015: 3 · 2014: 3 · 2013: 4 · 2012: 3
FWCI
2.11
Type
journal article
Language
en
Open access
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Eye Institute (R01EY011379, EY12196, P30EY012196)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
feedback projections, mouse visual cortex, cortical hierarchy, retrograde tracing, area 17, axon growth, postnatal development, corticocortical connections
MeSH terms
Animals, Axons, Brain Mapping, Mice, Inbred C57BL, Neural Inhibition, Visual Cortex, Visual Pathways, Mice, Neuroanatomical Tract-Tracing Techniques

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