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Breaking cover: neural responses to slow and fast camouflage-breaking motion

Primates need to detect and recognize camouflaged animals in natural environments. Camouflage-breaking movements are often the only visual cue available to accomplish this. Specifically, sudden movements are often detected before full recognition of the camouflaged animal is made, suggesting that in...

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Autores principales: Yin, Jiapeng, Gong, Hongliang, An, Xu, Chen, Zheyuan, Lu, Yiliang, Andolina, Ian M., McLoughlin, Niall, Wang, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4632627/
https://www.ncbi.nlm.nih.gov/pubmed/26269500
http://dx.doi.org/10.1098/rspb.2015.1182
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author Yin, Jiapeng
Gong, Hongliang
An, Xu
Chen, Zheyuan
Lu, Yiliang
Andolina, Ian M.
McLoughlin, Niall
Wang, Wei
author_facet Yin, Jiapeng
Gong, Hongliang
An, Xu
Chen, Zheyuan
Lu, Yiliang
Andolina, Ian M.
McLoughlin, Niall
Wang, Wei
author_sort Yin, Jiapeng
collection PubMed
description Primates need to detect and recognize camouflaged animals in natural environments. Camouflage-breaking movements are often the only visual cue available to accomplish this. Specifically, sudden movements are often detected before full recognition of the camouflaged animal is made, suggesting that initial processing of motion precedes the recognition of motion-defined contours or shapes. What are the neuronal mechanisms underlying this initial processing of camouflaged motion in the primate visual brain? We investigated this question using intrinsic-signal optical imaging of macaque V1, V2 and V4, along with computer simulations of the neural population responses. We found that camouflaged motion at low speed was processed as a direction signal by both direction- and orientation-selective neurons, whereas at high-speed camouflaged motion was encoded as a motion-streak signal primarily by orientation-selective neurons. No population responses were found to be invariant to the camouflage contours. These results suggest that the initial processing of camouflaged motion at low and high speeds is encoded as direction and motion-streak signals in primate early visual cortices. These processes are consistent with a spatio-temporal filter mechanism that provides for fast processing of motion signals, prior to full recognition of camouflage-breaking animals.
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spelling pubmed-46326272015-11-24 Breaking cover: neural responses to slow and fast camouflage-breaking motion Yin, Jiapeng Gong, Hongliang An, Xu Chen, Zheyuan Lu, Yiliang Andolina, Ian M. McLoughlin, Niall Wang, Wei Proc Biol Sci Research Articles Primates need to detect and recognize camouflaged animals in natural environments. Camouflage-breaking movements are often the only visual cue available to accomplish this. Specifically, sudden movements are often detected before full recognition of the camouflaged animal is made, suggesting that initial processing of motion precedes the recognition of motion-defined contours or shapes. What are the neuronal mechanisms underlying this initial processing of camouflaged motion in the primate visual brain? We investigated this question using intrinsic-signal optical imaging of macaque V1, V2 and V4, along with computer simulations of the neural population responses. We found that camouflaged motion at low speed was processed as a direction signal by both direction- and orientation-selective neurons, whereas at high-speed camouflaged motion was encoded as a motion-streak signal primarily by orientation-selective neurons. No population responses were found to be invariant to the camouflage contours. These results suggest that the initial processing of camouflaged motion at low and high speeds is encoded as direction and motion-streak signals in primate early visual cortices. These processes are consistent with a spatio-temporal filter mechanism that provides for fast processing of motion signals, prior to full recognition of camouflage-breaking animals. The Royal Society 2015-08-22 /pmc/articles/PMC4632627/ /pubmed/26269500 http://dx.doi.org/10.1098/rspb.2015.1182 Text en © 2015 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Research Articles
Yin, Jiapeng
Gong, Hongliang
An, Xu
Chen, Zheyuan
Lu, Yiliang
Andolina, Ian M.
McLoughlin, Niall
Wang, Wei
Breaking cover: neural responses to slow and fast camouflage-breaking motion
title Breaking cover: neural responses to slow and fast camouflage-breaking motion
title_full Breaking cover: neural responses to slow and fast camouflage-breaking motion
title_fullStr Breaking cover: neural responses to slow and fast camouflage-breaking motion
title_full_unstemmed Breaking cover: neural responses to slow and fast camouflage-breaking motion
title_short Breaking cover: neural responses to slow and fast camouflage-breaking motion
title_sort breaking cover: neural responses to slow and fast camouflage-breaking motion
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4632627/
https://www.ncbi.nlm.nih.gov/pubmed/26269500
http://dx.doi.org/10.1098/rspb.2015.1182
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