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Start Over Author "Nikola, T." Journal journal of comparative neurology
3 results on '"Nikola, T."'

2. Anatomy of hierarchy: Feedforward and feedback pathways in macaque visual cortex

Author

Shimon Ullman, Nikola T. Markov, Kenneth Knoblauch, Pascal Chameau, Cyril Huissoud, Henry Kennedy, Pierre Misery, Pascal Barone, Pascale Giroud, René Quilodran, Colette Dehay, Camille Lamy, Arnaud Falchier, Julien Vezoli, Institut cellule souche et cerveau (U846 Inserm - UCBL1), Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de la Santé et de la Recherche Médicale (INSERM), Swammerdam Institute for Life Sciences, Section Neurobiology, Oficina de Educación Médica, Facultad de Medicina Universidad de Valparaiso, Weizmann Institute of Science [Rehovot, Israël], Centre de recherche cerveau et cognition (CERCO), Institut des sciences du cerveau de Toulouse. (ISCT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Cellular and Computational Neuroscience (SILS, FNWI)

Subjects
Male, Visual system, Cell morphology, Macaque, Feedback, Sensory, biology.animal, Cortex (anatomy), neocortex, medicine, Animals, Visual Pathways, Research Articles, ComputingMilieux_MISCELLANEOUS, Visual Cortex, Neurons, cell morphology, Neocortex, biology, [SCCO.NEUR]Cognitive science/Neuroscience, General Neuroscience, Neuroanatomical Tract-Tracing Techniques, Anatomy, Macaca mulatta, Retrograde tracing, Macaca fascicularis, medicine.anatomical_structure, Visual cortex, Female, monkey, retrograde tracing, Neuroscience
Abstract

The laminar location of the cell bodies and terminals of interareal connections determines the hierarchical structural organization of the cortex and has been intensively studied. However, we still have only a rudimentary understanding of the connectional principles of feedforward (FF) and feedback (FB) pathways. Quantitative analysis of retrograde tracers was used to extend the notion that the laminar distribution of neurons interconnecting visual areas provides an index of hierarchical distance (percentage of supragranular labeled neurons [SLN]). We show that: 1) SLN values constrain models of cortical hierarchy, revealing previously unsuspected areal relations; 2) SLN reflects the operation of a combinatorial distance rule acting differentially on sets of connections between areas; 3) Supragranular layers contain highly segregated bottom-up and top-down streams, both of which exhibit point-to-point connectivity. This contrasts with the infragranular layers, which contain diffuse bottom-up and top-down streams; 4) Cell filling of the parent neurons of FF and FB pathways provides further evidence of compartmentalization; 5) FF pathways have higher weights, cross fewer hierarchical levels, and are less numerous than FB pathways. Taken together, the present results suggest that cortical hierarchies are built from supra- and infragranular counterstreams. This compartmentalized dual counterstream organization allows point-to-point connectivity in both bottom-up and top-down directions.

Published
2013

3. Anatomy of hierarchy: Feedforward and feedback pathways in macaque visual cortex

Author

Markov, Nikola T., primary, Vezoli, Julien, additional, Chameau, Pascal, additional, Falchier, Arnaud, additional, Quilodran, René, additional, Huissoud, Cyril, additional, Lamy, Camille, additional, Misery, Pierre, additional, Giroud, Pascale, additional, Ullman, Shimon, additional, Barone, Pascal, additional, Dehay, Colette, additional, Knoblauch, Kenneth, additional, and Kennedy, Henry, additional

Published
2013
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