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Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli

SIMPLE SUMMARY: Surround modulation is a basic visual attribute of sensory neurons in many species and has been extensively characterized in mammal primary visual cortex, lateral geniculate nucleus, and superior colliculus. Little attention has been paid to birds, which have a highly developed visua...

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Autores principales: Niu, Xiaoke, Huang, Shuman, Zhu, Minjie, Wang, Zhizhong, Shi, Li
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8868286/
https://www.ncbi.nlm.nih.gov/pubmed/35203185
http://dx.doi.org/10.3390/ani12040475
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author Niu, Xiaoke
Huang, Shuman
Zhu, Minjie
Wang, Zhizhong
Shi, Li
author_facet Niu, Xiaoke
Huang, Shuman
Zhu, Minjie
Wang, Zhizhong
Shi, Li
author_sort Niu, Xiaoke
collection PubMed
description SIMPLE SUMMARY: Surround modulation is a basic visual attribute of sensory neurons in many species and has been extensively characterized in mammal primary visual cortex, lateral geniculate nucleus, and superior colliculus. Little attention has been paid to birds, which have a highly developed visual system. We undertook a systematic analysis on surround modulation properties of tectal neurons in pigeons (Columba livia). This study complements existing studies on surrounding modulation properties in non-mammalian species and deepens the understanding of mechanisms of figure–background segmentation performed by avians. ABSTRACT: Surround modulation has been abundantly studied in several mammalian brain areas, including the primary visual cortex, lateral geniculate nucleus, and superior colliculus (SC), but systematic analysis is lacking in the avian optic tectum (OT, homologous to mammal SC). Here, multi-units were recorded from pigeon (Columba livia) OT, and responses to different sizes of moving, flashed squares, and bars were compared. The statistical results showed that most tectal neurons presented suppressed responses to larger stimuli in both moving and flashed paradigms, and suppression induced by flashed squares was comparable with moving ones when the stimuli center crossed the near classical receptive field (CRF) center, which corresponded to the full surrounding condition. Correspondingly, the suppression grew weaker when the stimuli center moved across the CRF border, equivalent to partially surrounding conditions. Similarly, suppression induced by full surrounding flashed squares was more intense than by partially surrounding flashed bars. These results suggest that inhibitions performed on tectal neurons appear to be full surrounding rather than locally lateral. This study enriches the understanding of surround modulation properties of avian tectum neurons and provides possible hypotheses about the arrangement of inhibitions from other nuclei, both of which are important for clarifying the mechanism of target detection against clutter background performed by avians.
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spelling pubmed-88682862022-02-25 Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli Niu, Xiaoke Huang, Shuman Zhu, Minjie Wang, Zhizhong Shi, Li Animals (Basel) Article SIMPLE SUMMARY: Surround modulation is a basic visual attribute of sensory neurons in many species and has been extensively characterized in mammal primary visual cortex, lateral geniculate nucleus, and superior colliculus. Little attention has been paid to birds, which have a highly developed visual system. We undertook a systematic analysis on surround modulation properties of tectal neurons in pigeons (Columba livia). This study complements existing studies on surrounding modulation properties in non-mammalian species and deepens the understanding of mechanisms of figure–background segmentation performed by avians. ABSTRACT: Surround modulation has been abundantly studied in several mammalian brain areas, including the primary visual cortex, lateral geniculate nucleus, and superior colliculus (SC), but systematic analysis is lacking in the avian optic tectum (OT, homologous to mammal SC). Here, multi-units were recorded from pigeon (Columba livia) OT, and responses to different sizes of moving, flashed squares, and bars were compared. The statistical results showed that most tectal neurons presented suppressed responses to larger stimuli in both moving and flashed paradigms, and suppression induced by flashed squares was comparable with moving ones when the stimuli center crossed the near classical receptive field (CRF) center, which corresponded to the full surrounding condition. Correspondingly, the suppression grew weaker when the stimuli center moved across the CRF border, equivalent to partially surrounding conditions. Similarly, suppression induced by full surrounding flashed squares was more intense than by partially surrounding flashed bars. These results suggest that inhibitions performed on tectal neurons appear to be full surrounding rather than locally lateral. This study enriches the understanding of surround modulation properties of avian tectum neurons and provides possible hypotheses about the arrangement of inhibitions from other nuclei, both of which are important for clarifying the mechanism of target detection against clutter background performed by avians. MDPI 2022-02-15 /pmc/articles/PMC8868286/ /pubmed/35203185 http://dx.doi.org/10.3390/ani12040475 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Niu, Xiaoke
Huang, Shuman
Zhu, Minjie
Wang, Zhizhong
Shi, Li
Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title_full Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title_fullStr Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title_full_unstemmed Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title_short Surround Modulation Properties of Tectal Neurons in Pigeons Characterized by Moving and Flashed Stimuli
title_sort surround modulation properties of tectal neurons in pigeons characterized by moving and flashed stimuli
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8868286/
https://www.ncbi.nlm.nih.gov/pubmed/35203185
http://dx.doi.org/10.3390/ani12040475
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