{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T11:11:41Z","timestamp":1790507501616,"version":"4.1.0"},"reference-count":34,"publisher":"The Company of Biologists","issue":"11","license":[{"start":{"date-parts":[[2021,6,1]],"date-time":"2021-06-01T00:00:00Z","timestamp":1622505600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"funder":[{"DOI":"10.13039\/501100000268","name":"Biotechnology and Biological Sciences Research Council","doi-asserted-by":"crossref","award":["BB\/L008815\/1"],"award-info":[{"award-number":["BB\/L008815\/1"]}],"id":[{"id":"10.13039\/501100000268","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,6,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>To conceal themselves on the seafloor, European cuttlefish, Sepia officinalis, express a large repertoire of body patterns. Scenes with 3D relief are especially challenging because it is not possible either to directly recover visual depth from the 2D retinal image or for the cuttlefish to alter its body shape to resemble nearby objects. Here, we characterised cuttlefish camouflage responses to 3D relief, and to cast shadows, which are complementary depth cues. Animals were recorded in the presence of cylindrical objects of fixed (15\u2005mm) diameter, but varying in height, greyscale and strength of cast shadows, and to corresponding 2D pictorial images. With the cylinders, the cuttlefish expressed a \u20183D\u2019 body pattern, which is distinct from previously described Uniform, Mottle and Disruptive camouflage patterns. This pattern was insensitive to variation in object height, contrast and cast shadow, except when shadows were most pronounced, in which case the body patterns resembled those used on the 2D backgrounds. This suggests that stationary cast shadows are not used as visual depth cues by cuttlefish, and that rather than directly matching the 2D retinal image, the camouflage response is a two-stage process whereby the animal first classifies the physical environment and then selects an appropriate pattern. Each type of pattern is triggered by specific cues that may compete, allowing the animal to select the most suitable camouflage, so the camouflage response is categorical rather than continuously variable. These findings give unique insight into how an invertebrate senses its visual environment to generate the body pattern response.<\/jats:p>","DOI":"10.1242\/jeb.238717","type":"journal-article","created":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T12:13:25Z","timestamp":1621253605000},"source":"Crossref","is-referenced-by-count":21,"title":["Visual perception and camouflage response to 3D backgrounds and cast shadows in the European cuttlefish, <i>Sepia officinalis<\/i>"],"prefix":"10.1242","volume":"224","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0079-0906","authenticated-orcid":false,"given":"Aliya","family":"El Nagar","sequence":"first","affiliation":[{"name":"School of Biology , University of Leeds, Leeds, LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Osorio","sequence":"additional","affiliation":[{"name":"School of Life Sciences , University of Sussex, Brighton, BN1 9QG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Zylinski","sequence":"additional","affiliation":[{"name":"School of Biology , University of Leeds, Leeds, LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven M.","family":"Sait","sequence":"additional","affiliation":[{"name":"School of Biology , University of Leeds, Leeds, LS2 9JT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2021,6,10]]},"reference":[{"key":"2021061011333259800_JEB238717C1","doi-asserted-by":"publisher","first-page":"333","DOI":"10.1068\/p5233","article-title":"Does the use of natural stimuli facilitate amodal completion in pigeons?","volume":"35","author":"Aust","year":"2006","journal-title":"Perception"},{"key":"2021061011333259800_JEB238717C2","doi-asserted-by":"publisher","first-page":"1139","DOI":"10.1242\/jeb.02741","article-title":"Disruptive coloration in cuttlefish: a visual perception mechanism that regulates ontogenetic adjustment of skin patterning","volume":"210","author":"Barbosa","year":"2007","journal-title":"J. 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