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  • 1
    Publication Date: 2016-04-28
    Description: The primary visual cortex contains a detailed map of the visual scene, which is represented according to multiple stimulus dimensions including spatial location, ocular dominance and stimulus orientation. The maps for spatial location and ocular dominance arise from the spatial arrangement of thalamic afferent axons in the cortex. However, the origins of the other maps remain unclear. Here we show that the cortical maps for orientation, direction and retinal disparity in the cat (Felis catus) are all strongly related to the organization of the map for spatial location of light (ON) and dark (OFF) stimuli, an organization that we show is OFF-dominated, OFF-centric and runs orthogonal to ocular dominance columns. Because this ON-OFF organization originates from the clustering of ON and OFF thalamic afferents in the visual cortex, we conclude that all main features of visual cortical topography, including orientation, direction and retinal disparity, follow a common organizing principle that arranges thalamic axons with similar retinotopy and ON-OFF polarity in neighbouring cortical regions.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860131/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860131/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kremkow, Jens -- Jin, Jianzhong -- Wang, Yushi -- Alonso, Jose M -- EY005253/EY/NEI NIH HHS/ -- R01 EY005253/EY/NEI NIH HHS/ -- R01 EY020679/EY/NEI NIH HHS/ -- England -- Nature. 2016 May 5;533(7601):52-7. doi: 10.1038/nature17936. Epub 2016 Apr 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Center for Vision Research, State University of New York, College of Optometry, 33 West 42nd Street, New York, New York 10036, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27120164" target="_blank"〉PubMed〈/a〉
    Keywords: Afferent Pathways/radiation effects ; Animals ; Axons/physiology ; *Brain Mapping ; Cats ; Darkness ; Dominance, Ocular/physiology ; Light ; Macaca mulatta ; Male ; Models, Neurological ; Orientation/physiology/radiation effects ; Photic Stimulation ; Retina/physiology/radiation effects ; Space Perception/*physiology/radiation effects ; Thalamus/physiology/radiation effects ; Visual Cortex/*physiology/radiation effects ; Visual Fields/*physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2014-02-26
    Description: Astronomers and physicists noticed centuries ago that visual spatial resolution is higher for dark than light stimuli, but the neuronal mechanisms for this perceptual asymmetry remain unknown. Here we demonstrate that the asymmetry is caused by a neuronal nonlinearity in the early visual pathway. We show that neurons driven by...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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