Cuttlefish Are Dazzling, But Do They Dream?


Scientific American May 2019

The marine mollusks display behavior that resembles sleep, including cycles of rapid eye movement 

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” data-newsletterpromo-image=”https://static.scientificamerican.com/sciam/cache/file/458BF87F-514B-44EE-B87F5D531772CF83_source.png” data-newsletterpromo-button-text=”Sign Up” data-newsletterpromo-button-link=”https://www.scientificamerican.com/page/newsletter-sign-up/?origincode=2018_sciam_ArticlePromo_NewsletterSignUp” itemprop=”articleBody”>Cuttlefish are known for their sophisticated camouflage, as well as their kaleidoscopic displays for attracting mates and mesmerizing prey. These close relatives of squid and octopuses achieve such feats via millions of chromatophores—tiny sacs of pigment under the skin attached to muscles that squeeze or relax to push colors to the surface. In a new study, researchers report they have observed resting cuttlefish cyclically changing color and twitching their limbs in phases that resemble rapid eye movement (REM) sleep.



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