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Cereb Cortex. 2019 Aug 26. pii: bhz175. doi: 10.1093/cercor/bhz175. [Epub ahead of print]

Unique Features of Subcortical Circuits in a Macaque Model of Congenital Blindness.

Author information

1
Univ Lyon, Université Claude Bernard Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500 Bron, France.
2
Université De Toulouse Paul Sabatier, 31062 Toulouse, France.
3
Centre De Recherche Cerveau & Cognition, CNRS, UMR 5549, 31059 Toulouse, France.
4
Princeton Neuroscience Institute and Department of Psychology, Princeton University, Princeton, 08544, USA.
5
Swammerdam Institute for Life Sciences, Center for Neuroscience, University of Amsterdam, 1090 GE, Amsterdam, The Netherlands.
6
Department of Neurobiology and Behavior, University of California, Irvine, CA 92717, USA.
7
Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Key Laboratory of Primate Neurobiology, Shanghai 200031, China.

Abstract

There is an extensive modification of the functional organization of the brain in the congenital blind human, although there is little understanding of the structural underpinnings of these changes. The visual system of macaque has been extensively characterized both anatomically and functionally. We have taken advantage of this to examine the influence of congenital blindness in a macaque model of developmental anophthalmia. Developmental anophthalmia in macaque effectively removes the normal influence of the thalamus on cortical development leading to an induced "hybrid cortex (HC)" combining features of primary visual and extrastriate cortex. Here we show that retrograde tracers injected in early visual areas, including HC, reveal a drastic reduction of cortical projections of the reduced lateral geniculate nucleus. In addition, there is an important expansion of projections from the pulvinar complex to the HC, compared to the controls. These findings show that the functional consequences of congenital blindness need to be considered in terms of both modifications of the interareal cortical network and the ascending visual pathways.

KEYWORDS:

connectivity; deafferentation; hybrid cortex; primate; pulvinar

PMID:
31504286
DOI:
10.1093/cercor/bhz175

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