A cortex-like canonical circuit in the avian forebrain

Stacho, Martin; Herold, Christina; Rook, Noemi; Wagner, Hermann; Axer, Markus; Amunts, Katrin; Güntürkün, Onur

doi:10.1126/science.abc5534

Cited by 162 publications

(186 citation statements)

References 72 publications

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“…Recent descriptions of the anatomical organization of the visual and auditory areas of DVR have shown that both these regions share a common laminar/columnar cytoarchitecture, comparable in their organization to the one entailed in mammalian sensory cortices. Whether nucleus basorostralis pallii and the internal portion of its overlying mesopallial zone, along with a columnar organization of the cells in this region (Dubbeldam & Visser, 1987;Stacho et al, 2020). The detailed description obtained by us using up-to-date neural tracing methods confirmed and extended these previous results and established the extent to which a "canonical" pallial circuitry can be found in all sensory areas of the avian DVR.…”

Section: Discussionsupporting

confidence: 76%

“…Specifically, both these regions appear organized as complexes of laminarly arranged cell groups highly interconnected in a "laminar/columnar" fashion, in such a way that cells located in homotopic positions in each of the forming layers (senso-recipient nidopallium, intermediate nidopallium, and ventral mesopallium) are reciprocally linked by a local loop of axonal processes running across these layers (Ahumada-Galleguillos et al, 2015;Fern andez, Ahumada-Galleguillos, et al, 2020;Wang et al, 2010). Interestingly, such laminar/columnar arrangement bears a striking resemblance to that of the mammalian sensory cortices at laminar, cellular and intrinsic circuitry levels (Dugas-Ford et al, 2012;Faunes et al, 2015;Jarvis et al, 2013;Karten, 2015;Stacho et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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A canonical interlaminar circuit in the sensory dorsal ventricular ridge of birds: The anatomical organization of the trigeminal pallium

Fernández

Reyes-Pinto

Norambuena

et al. 2021

J of Comparative Neurology

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The dorsal ventricular ridge (DVR), which is the largest component of the avian pallium, contains discrete partitions receiving tectovisual, auditory, and trigeminal ascending projections. Recent studies have shown that the auditory and the tectovisual regions can be regarded as complexes composed of three highly interconnected layers: an internal senso-recipient one, an intermediate afferent/efferent one, and a more external re-entrant one. Cells located in homotopic positions in each of these layers are reciprocally linked by an interlaminar loop of axonal processes, forming columnar-like local circuits. Whether this type of organization also extends to the trigemino-recipient DVR is, at present, not known. This question is of interest, since afferents forming this sensory pathway, exceptional among amniotes, are not thalamic but rhombencephalic in origin. We investigated this question by placing minute injections of neural tracers into selected locations of vital slices of the chicken telencephalon. We found that neurons of the trigemino-recipient nucleus basorostralis pallii (Bas) establish reciprocal, columnar and homotopical projections with cells located in the overlying ventral mesopallium (MV). "Column-forming" axons originated in B and MV terminate also in the intermediate strip, the fronto-trigeminal nidopallium (NFT), in a restricted manner. We also found that the NFT and an internal partition of B originate substantial, coarse-topographic projections to the underlying portion of the lateral striatum. We conclude that all sensory areas of the DVR are organized according to a common neuroarchitectonic motif, which bears a striking resemblance to that of the radial/laminar intrinsic circuits of the sensory cortices of mammals.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

A canonical interlaminar circuit in the sensory dorsal ventricular ridge of birds: The anatomical organization of the trigeminal pallium

Fernández

Reyes-Pinto

Norambuena

et al. 2021

J of Comparative Neurology

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“…From a neurobiological perspective, most studies on number cognition focused on primates' cortical areas and on the nidopallium caudolaterale (NCL) of corvids, which is supposed to be equivalent to the primates' prefrontal cortex (Mogensen and Divac, 1982;Divac et al, 1985;Güntürkün, 2005;Nieder, 2018;Stacho et al, 2020). In comparison, few studies investigated the contribution of subcortical (sub-pallial) regions.…”

Section: Numerosities and Other Kind Of Magnitudes In The Brainsmentioning

confidence: 99%

Numerosities and Other Magnitudes in the Brains: A Comparative View

2021

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The ability to represent, discriminate, and perform arithmetic operations on discrete quantities (numerosities) has been documented in a variety of species of different taxonomic groups, both vertebrates and invertebrates. We do not know, however, to what extent similarity in behavioral data corresponds to basic similarity in underlying neural mechanisms. Here, we review evidence for magnitude representation, both discrete (countable) and continuous, following the sensory input path from primary sensory systems to associative pallial territories in the vertebrate brains. We also speculate on possible underlying mechanisms in invertebrate brains and on the role played by modeling with artificial neural networks. This may provide a general overview on the nervous system involvement in approximating quantity in different animal species, and a general theoretical framework to future comparative studies on the neurobiology of number cognition.

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“…Clarifying the degree to which these patterns extend across vertebrates requires examining other episodes of encephalization. Crown birds offer an excellent comparative system to mammals, even primates, because they share neuroanatomical features that evolved independently, including a relatively large brain size ( Jerison, 1973 ; Nieuwenhuys et al, 1998 ; Northcutt, 2002 ; Butler and Hodos, 2005 ; Iwaniuk et al, 2005 ; Gill, 2006 ), globular brains with expanded cerebra, specialized cytoarchitecture and neuron types ( Reiner et al, 2004 ; Dugas-Ford et al, 2012 ; Shanahan et al, 2013 ; Pfenning et al, 2014 ; Karten, 2015 ; Stacho et al, 2020 ), and the capacity to perform higher cognitive behaviors ( Lefebvre et al, 2002 ; Weir et al, 2002 ; Emery, 2006 ; Auersperg et al, 2012 ; Kabadayi et al, 2016 ; Bayern et al, 2018 ; Boeckle et al, 2020 ). In addition, they feature remarkable variation in brain morphology that is conducive to macroevolutionary studies ( Iwaniuk and Hurd, 2005 ; Figure 1 ).…”

Section: Introductionmentioning

confidence: 99%

Novel neuroanatomical integration and scaling define avian brain shape evolution and development

Watanabe

Balanoff

Gignac

et al. 2021

eLife

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How do large and unique brains evolve? Historically, comparative neuroanatomical studies have attributed the evolutionary genesis of highly encephalized brains to deviations along, as well as from, conserved scaling relationships among brain regions. However, the relative contributions of these concerted (integrated) and mosaic (modular) processes as drivers of brain evolution remain unclear, especially in non-mammalian groups. While proportional brain sizes have been the predominant metric used to characterize brain morphology to date, we perform a high-density geometric morphometric analysis on the encephalized brains of crown birds (Neornithes or Aves) compared to their stem taxa—the non-avialan coelurosaurian dinosaurs and Archaeopteryx. When analyzed together with developmental neuroanatomical data of model archosaurs (Gallus, Alligator), crown birds exhibit a distinct allometric relationship that dictates their brain evolution and development. Furthermore, analyses by neuroanatomical regions reveal that the acquisition of this derived shape-to-size scaling relationship occurred in a mosaic pattern, where the avian-grade optic lobe and cerebellum evolved first among non-avialan dinosaurs, followed by major changes to the evolutionary and developmental dynamics of cerebrum shape after the origin of Avialae. Notably, the brain of crown birds is a more integrated structure than non-avialan archosaurs, implying that diversification of brain morphologies within Neornithes proceeded in a more coordinated manner, perhaps due to spatial constraints and abbreviated growth period. Collectively, these patterns demonstrate a plurality in evolutionary processes that generate encephalized brains in archosaurs and across vertebrates.

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A cortex-like canonical circuit in the avian forebrain

Abstract: Although the avian pallium seems to lack an organization akin to that of the cerebral cortex, birds exhibit extraordinary cognitive skills that are comparable to those of mammals. We analyzed the fiber architecture of the avian pallium with three-dimensional polari… Show more

Cited by 162 publications

References 72 publications

A canonical interlaminar circuit in the sensory dorsal ventricular ridge of birds: The anatomical organization of the trigeminal pallium

A canonical interlaminar circuit in the sensory dorsal ventricular ridge of birds: The anatomical organization of the trigeminal pallium

Numerosities and Other Magnitudes in the Brains: A Comparative View

Novel neuroanatomical integration and scaling define avian brain shape evolution and development

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