Orientation Preference Maps in Microcebus murinus Reveal Size-Invariant Design Principles in Primate Visual Cortex.
Microcebus Murinus
mouse lemur
orientation preference maps
pinwheels
visual cortex
Journal
Current biology : CB
ISSN: 1879-0445
Titre abrégé: Curr Biol
Pays: England
ID NLM: 9107782
Informations de publication
Date de publication:
22 02 2021
22 02 2021
Historique:
received:
19
07
2020
revised:
08
10
2020
accepted:
11
11
2020
pubmed:
5
12
2020
medline:
27
1
2022
entrez:
4
12
2020
Statut:
ppublish
Résumé
Orientation preference maps (OPMs) are a prominent feature of primary visual cortex (V1) organization in many primates and carnivores. In rodents, neurons are not organized in OPMs but are instead interspersed in a "salt and pepper" fashion, although clusters of orientation-selective neurons have been reported. Does this fundamental difference reflect the existence of a lower size limit for orientation columns (OCs) below which they cannot be scaled down with decreasing V1 size? To address this question, we examined V1 of one of the smallest living primates, the 60-g prosimian mouse lemur (Microcebus murinus). Using chronic intrinsic signal imaging, we found that mouse lemur V1 contains robust OCs, which are arranged in a pinwheel-like fashion. OC size in mouse lemurs was found to be only marginally smaller compared to the macaque, suggesting that these circuit elements are nearly incompressible. The spatial arrangement of pinwheels is well described by a common mathematical design of primate V1 circuit organization. In order to accommodate OPMs, we found that the mouse lemur V1 covers one-fifth of the cortical surface, which is one of the largest V1-to-cortex ratios found in primates. These results indicate that the primate-type visual cortical circuit organization is constrained by a size limitation and raises the possibility that its emergence might have evolved by disruptive innovation rather than gradual change.
Identifiants
pubmed: 33275889
pii: S0960-9822(20)31738-3
doi: 10.1016/j.cub.2020.11.027
pmc: PMC9026768
mid: NIHMS1795838
pii:
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
733-741.e7Subventions
Organisme : NEI NIH HHS
ID : P30 EY014800
Pays : United States
Organisme : NEI NIH HHS
ID : R01 EY019743
Pays : United States
Organisme : NEI NIH HHS
ID : R01 EY026812
Pays : United States
Organisme : NEI NIH HHS
ID : R01 EY031959
Pays : United States
Commentaires et corrections
Type : CommentIn
Informations de copyright
Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of Interests The authors declare no competing interests.
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