Cyclic alternation of quiet and active sleep states in the octopus

Previous observations suggest the existence of ‘Active sleep’ in cephalopods. To investigate in detail the behavioral structure of cephalopod sleep, we video-recorded four adult specimens of Octopus insularis and quantified their distinct states and transitions. Changes in skin color and texture and...

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Bibliographic Details
Published in:	iScience Vol. 24; no. 4; p. 102223
Main Authors:	Medeiros, Sylvia Lima de Souza, Paiva, Mizziara Marlen Matias de, Lopes, Paulo Henrique, Blanco, Wilfredo, Lima, Françoise Dantas de, Oliveira, Jaime Bruno Cirne de, Medeiros, Inácio Gomes, Sequerra, Eduardo Bouth, de Souza, Sandro, Leite, Tatiana Silva, Ribeiro, Sidarta
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 23-04-2021 Elsevier
Subjects:	Biological Sciences Ethology Zoology Biological Sciences Ethology Zoology
Online Access:	Get full text
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Summary:	Previous observations suggest the existence of ‘Active sleep’ in cephalopods. To investigate in detail the behavioral structure of cephalopod sleep, we video-recorded four adult specimens of Octopus insularis and quantified their distinct states and transitions. Changes in skin color and texture and movements of eyes and mantle were assessed using automated image processing tools, and arousal threshold was measured using sensory stimulation. Two distinct states unresponsive to stimulation occurred in tandem. The first was a ‘Quiet sleep’ state with uniformly pale skin, closed pupils, and long episode durations (median 415.2 s). The second was an ‘Active sleep’ state with dynamic skin patterns of color and texture, rapid eye movements, and short episode durations (median 40.8 s). ‘Active sleep’ was periodic (60% of recurrences between 26 and 39 min) and occurred mostly after ‘Quiet sleep’ (82% of transitions). These results suggest that cephalopods have an ultradian sleep cycle analogous to that of amniotes. [Display omitted] •Octopus has ‘Quiet’ and ‘Active sleep’, with different episode duration and periodicity•States differ on arousal thresholds, skin color and texture, and eye and mantle movement•The results suggest that octopus has a sleep cycle analogous to that of amniotes Biological Sciences; Zoology; Ethology
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Lead contact
ISSN:	2589-0042 2589-0042
DOI:	10.1016/j.isci.2021.102223