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The dynamics of pattern matching in camouflaging cuttlefish

Many cephalopods escape detection using camouflage(1). This behaviour relies on a visual assessment of the surroundings, on an interpretation of visual-texture statistics(2–4) and on matching these statistics using millions of skin chromatophores that are controlled by motoneurons located in the bra...

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Autores principales: Woo, Theodosia, Liang, Xitong, Evans, Dominic A., Fernandez, Olivier, Kretschmer, Friedrich, Reiter, Sam, Laurent, Gilles
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10322717/
https://www.ncbi.nlm.nih.gov/pubmed/37380772
http://dx.doi.org/10.1038/s41586-023-06259-2
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author Woo, Theodosia
Liang, Xitong
Evans, Dominic A.
Fernandez, Olivier
Kretschmer, Friedrich
Reiter, Sam
Laurent, Gilles
author_facet Woo, Theodosia
Liang, Xitong
Evans, Dominic A.
Fernandez, Olivier
Kretschmer, Friedrich
Reiter, Sam
Laurent, Gilles
author_sort Woo, Theodosia
collection PubMed
description Many cephalopods escape detection using camouflage(1). This behaviour relies on a visual assessment of the surroundings, on an interpretation of visual-texture statistics(2–4) and on matching these statistics using millions of skin chromatophores that are controlled by motoneurons located in the brain(5–7). Analysis of cuttlefish images proposed that camouflage patterns are low dimensional and categorizable into three pattern classes, built from a small repertoire of components(8–11). Behavioural experiments also indicated that, although camouflage requires vision, its execution does not require feedback(5,12,13), suggesting that motion within skin-pattern space is stereotyped and lacks the possibility of correction. Here, using quantitative methods(14), we studied camouflage in the cuttlefish Sepia officinalis as behavioural motion towards background matching in skin-pattern space. An analysis of hundreds of thousands of images over natural and artificial backgrounds revealed that the space of skin patterns is high-dimensional and that pattern matching is not stereotyped—each search meanders through skin-pattern space, decelerating and accelerating repeatedly before stabilizing. Chromatophores could be grouped into pattern components on the basis of their covariation during camouflaging. These components varied in shapes and sizes, and overlay one another. However, their identities varied even across transitions between identical skin-pattern pairs, indicating flexibility of implementation and absence of stereotypy. Components could also be differentiated by their sensitivity to spatial frequency. Finally, we compared camouflage to blanching, a skin-lightening reaction to threatening stimuli. Pattern motion during blanching was direct and fast, consistent with open-loop motion in low-dimensional pattern space, in contrast to that observed during camouflage.
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spelling pubmed-103227172023-07-07 The dynamics of pattern matching in camouflaging cuttlefish Woo, Theodosia Liang, Xitong Evans, Dominic A. Fernandez, Olivier Kretschmer, Friedrich Reiter, Sam Laurent, Gilles Nature Article Many cephalopods escape detection using camouflage(1). This behaviour relies on a visual assessment of the surroundings, on an interpretation of visual-texture statistics(2–4) and on matching these statistics using millions of skin chromatophores that are controlled by motoneurons located in the brain(5–7). Analysis of cuttlefish images proposed that camouflage patterns are low dimensional and categorizable into three pattern classes, built from a small repertoire of components(8–11). Behavioural experiments also indicated that, although camouflage requires vision, its execution does not require feedback(5,12,13), suggesting that motion within skin-pattern space is stereotyped and lacks the possibility of correction. Here, using quantitative methods(14), we studied camouflage in the cuttlefish Sepia officinalis as behavioural motion towards background matching in skin-pattern space. An analysis of hundreds of thousands of images over natural and artificial backgrounds revealed that the space of skin patterns is high-dimensional and that pattern matching is not stereotyped—each search meanders through skin-pattern space, decelerating and accelerating repeatedly before stabilizing. Chromatophores could be grouped into pattern components on the basis of their covariation during camouflaging. These components varied in shapes and sizes, and overlay one another. However, their identities varied even across transitions between identical skin-pattern pairs, indicating flexibility of implementation and absence of stereotypy. Components could also be differentiated by their sensitivity to spatial frequency. Finally, we compared camouflage to blanching, a skin-lightening reaction to threatening stimuli. Pattern motion during blanching was direct and fast, consistent with open-loop motion in low-dimensional pattern space, in contrast to that observed during camouflage. Nature Publishing Group UK 2023-06-28 2023 /pmc/articles/PMC10322717/ /pubmed/37380772 http://dx.doi.org/10.1038/s41586-023-06259-2 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Woo, Theodosia
Liang, Xitong
Evans, Dominic A.
Fernandez, Olivier
Kretschmer, Friedrich
Reiter, Sam
Laurent, Gilles
The dynamics of pattern matching in camouflaging cuttlefish
title The dynamics of pattern matching in camouflaging cuttlefish
title_full The dynamics of pattern matching in camouflaging cuttlefish
title_fullStr The dynamics of pattern matching in camouflaging cuttlefish
title_full_unstemmed The dynamics of pattern matching in camouflaging cuttlefish
title_short The dynamics of pattern matching in camouflaging cuttlefish
title_sort dynamics of pattern matching in camouflaging cuttlefish
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10322717/
https://www.ncbi.nlm.nih.gov/pubmed/37380772
http://dx.doi.org/10.1038/s41586-023-06259-2
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