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Synaptic organization of visual space in primary visual cortex

How a sensory stimulus is processed and perceived depends on the surrounding sensory scene. In the visual cortex, contextual signals can be conveyed by an extensive network of intra- and inter-areal excitatory connections that link neurons representing stimulus features separated in visual space1–4....

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Autores principales: Iacaruso, M. Florencia, Gasler, Ioana T., Hofer, Sonja B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5533220/
https://www.ncbi.nlm.nih.gov/pubmed/28700575
http://dx.doi.org/10.1038/nature23019
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author Iacaruso, M. Florencia
Gasler, Ioana T.
Hofer, Sonja B.
author_facet Iacaruso, M. Florencia
Gasler, Ioana T.
Hofer, Sonja B.
author_sort Iacaruso, M. Florencia
collection PubMed
description How a sensory stimulus is processed and perceived depends on the surrounding sensory scene. In the visual cortex, contextual signals can be conveyed by an extensive network of intra- and inter-areal excitatory connections that link neurons representing stimulus features separated in visual space1–4. However, the connectional logic of visual contextual inputs remains unknown; it is not clear what information individual neurons receive from different parts of the visual field, nor how this input relates to the visual features a neuron encodes, defined by its spatial receptive field. We determined the organisation of excitatory synaptic inputs responding to different locations in the visual scene by mapping spatial receptive fields in dendritic spines of mouse visual cortex neurons using two-photon calcium imaging. We found that neurons received functionally diverse inputs from extended regions of visual space. Inputs representing similar visual features from the same location in visual space were more likely to cluster on neighbouring spines. Inputs from visual field regions beyond the postsynaptic neuron’s receptive field often synapsed on higher-order dendritic branches. These putative long-range inputs were more frequent and more likely to share the preference for oriented edges with the postsynaptic neuron when the input’s receptive field was spatially displaced along the axis of the postsynaptic neuron’s receptive field orientation. Therefore, the connectivity between neurons with displaced receptive fields obeys a specific rule, whereby they connect preferentially when their receptive fields are co-oriented and co-axially aligned. This organization of synaptic connectivity is ideally suited for amplification of elongated edges, which are enriched in the visual environment, and thus provides a potential substrate for contour integration and object grouping.
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spelling pubmed-55332202018-01-12 Synaptic organization of visual space in primary visual cortex Iacaruso, M. Florencia Gasler, Ioana T. Hofer, Sonja B. Nature Article How a sensory stimulus is processed and perceived depends on the surrounding sensory scene. In the visual cortex, contextual signals can be conveyed by an extensive network of intra- and inter-areal excitatory connections that link neurons representing stimulus features separated in visual space1–4. However, the connectional logic of visual contextual inputs remains unknown; it is not clear what information individual neurons receive from different parts of the visual field, nor how this input relates to the visual features a neuron encodes, defined by its spatial receptive field. We determined the organisation of excitatory synaptic inputs responding to different locations in the visual scene by mapping spatial receptive fields in dendritic spines of mouse visual cortex neurons using two-photon calcium imaging. We found that neurons received functionally diverse inputs from extended regions of visual space. Inputs representing similar visual features from the same location in visual space were more likely to cluster on neighbouring spines. Inputs from visual field regions beyond the postsynaptic neuron’s receptive field often synapsed on higher-order dendritic branches. These putative long-range inputs were more frequent and more likely to share the preference for oriented edges with the postsynaptic neuron when the input’s receptive field was spatially displaced along the axis of the postsynaptic neuron’s receptive field orientation. Therefore, the connectivity between neurons with displaced receptive fields obeys a specific rule, whereby they connect preferentially when their receptive fields are co-oriented and co-axially aligned. This organization of synaptic connectivity is ideally suited for amplification of elongated edges, which are enriched in the visual environment, and thus provides a potential substrate for contour integration and object grouping. 2017-07-12 2017-07-27 /pmc/articles/PMC5533220/ /pubmed/28700575 http://dx.doi.org/10.1038/nature23019 Text en Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms
spellingShingle Article
Iacaruso, M. Florencia
Gasler, Ioana T.
Hofer, Sonja B.
Synaptic organization of visual space in primary visual cortex
title Synaptic organization of visual space in primary visual cortex
title_full Synaptic organization of visual space in primary visual cortex
title_fullStr Synaptic organization of visual space in primary visual cortex
title_full_unstemmed Synaptic organization of visual space in primary visual cortex
title_short Synaptic organization of visual space in primary visual cortex
title_sort synaptic organization of visual space in primary visual cortex
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5533220/
https://www.ncbi.nlm.nih.gov/pubmed/28700575
http://dx.doi.org/10.1038/nature23019
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