Columnar processing of border ownership in primate visual cortex

To understand a visual scene, the brain segregates figures from background by assigning borders to foreground objects. Neurons in primate visual cortex encode which object owns a border (border ownership), but the underlying circuitry is not understood. Here, we used multielectrode probes to record...

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Autores principales:	Tom P Franken, John H Reynolds
Formato:	article
Lenguaje:	EN
Publicado:	eLife Sciences Publications Ltd 2021
Materias:	figure-ground segregation visual scene segmentation single unit artificial dura orientation tuning multiunit Medicine R Science Q Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/a3c10bdbb4d34bb4aedbd0cdfb02493c
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spelling	oai:doaj.org-article:a3c10bdbb4d34bb4aedbd0cdfb02493c2021-12-03T16:05:48ZColumnar processing of border ownership in primate visual cortex10.7554/eLife.725732050-084Xe72573https://doaj.org/article/a3c10bdbb4d34bb4aedbd0cdfb02493c2021-11-01T00:00:00Zhttps://elifesciences.org/articles/72573https://doaj.org/toc/2050-084XTo understand a visual scene, the brain segregates figures from background by assigning borders to foreground objects. Neurons in primate visual cortex encode which object owns a border (border ownership), but the underlying circuitry is not understood. Here, we used multielectrode probes to record from border ownership-selective units in different layers in macaque visual area V4 to study the laminar organization and timing of border ownership selectivity. We find that border ownership selectivity occurs first in deep layer units, in contrast to spike latency for small stimuli in the classical receptive field. Units on the same penetration typically share the preferred side of border ownership, also across layers, similar to orientation preference. Units are often border ownership-selective for a range of border orientations, where the preferred sides of border ownership are systematically organized in visual space. Together our data reveal a columnar organization of border ownership in V4 where the earliest border ownership signals are not simply inherited from upstream areas, but computed by neurons in deep layers, and may thus be part of signals fed back to upstream cortical areas or the oculomotor system early after stimulus onset. The finding that preferred border ownership is clustered and can cover a wide range of spatially contiguous locations suggests that the asymmetric context integrated by these neurons is provided in a systematically clustered manner, possibly through corticocortical feedback and horizontal connections.Tom P FrankenJohn H ReynoldseLife Sciences Publications Ltdarticlefigure-ground segregationvisual scene segmentationsingle unitartificial duraorientation tuningmultiunitMedicineRScienceQBiology (General)QH301-705.5ENeLife, Vol 10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	figure-ground segregation visual scene segmentation single unit artificial dura orientation tuning multiunit Medicine R Science Q Biology (General) QH301-705.5
spellingShingle	figure-ground segregation visual scene segmentation single unit artificial dura orientation tuning multiunit Medicine R Science Q Biology (General) QH301-705.5 Tom P Franken John H Reynolds Columnar processing of border ownership in primate visual cortex
description	To understand a visual scene, the brain segregates figures from background by assigning borders to foreground objects. Neurons in primate visual cortex encode which object owns a border (border ownership), but the underlying circuitry is not understood. Here, we used multielectrode probes to record from border ownership-selective units in different layers in macaque visual area V4 to study the laminar organization and timing of border ownership selectivity. We find that border ownership selectivity occurs first in deep layer units, in contrast to spike latency for small stimuli in the classical receptive field. Units on the same penetration typically share the preferred side of border ownership, also across layers, similar to orientation preference. Units are often border ownership-selective for a range of border orientations, where the preferred sides of border ownership are systematically organized in visual space. Together our data reveal a columnar organization of border ownership in V4 where the earliest border ownership signals are not simply inherited from upstream areas, but computed by neurons in deep layers, and may thus be part of signals fed back to upstream cortical areas or the oculomotor system early after stimulus onset. The finding that preferred border ownership is clustered and can cover a wide range of spatially contiguous locations suggests that the asymmetric context integrated by these neurons is provided in a systematically clustered manner, possibly through corticocortical feedback and horizontal connections.
format	article
author	Tom P Franken John H Reynolds
author_facet	Tom P Franken John H Reynolds
author_sort	Tom P Franken
title	Columnar processing of border ownership in primate visual cortex
title_short	Columnar processing of border ownership in primate visual cortex
title_full	Columnar processing of border ownership in primate visual cortex
title_fullStr	Columnar processing of border ownership in primate visual cortex
title_full_unstemmed	Columnar processing of border ownership in primate visual cortex
title_sort	columnar processing of border ownership in primate visual cortex
publisher	eLife Sciences Publications Ltd
publishDate	2021
url	https://doaj.org/article/a3c10bdbb4d34bb4aedbd0cdfb02493c
work_keys_str_mv	AT tompfranken columnarprocessingofborderownershipinprimatevisualcortex AT johnhreynolds columnarprocessingofborderownershipinprimatevisualcortex
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Columnar processing of border ownership in primate visual cortex

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