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Title: Cyclic alternation of quiet and active sleep states in the octopus
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
Souza, Sandro José de
Leite, Tatiana Silva
Ribeiro, Sidarta Tollendal Gomes
Keywords: Splee state;Octopus insularis;Ethology;Zoology;Biological
Issue Date: 25-Mar-2021
Publisher: Elsevier BV
Citation: 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; SOUZA, Sandro de; LEITE, Tatiana Silva. Cyclic alternation of quiet and active sleep states in the octopus. Iscience, [S.L.], p. 102223, mar. 2021. doi:
Portuguese Abstract: 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
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